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BREEAM Indoor Air Quality Testing
BREEAM Indoor Air Quality Testing

BREEAM Indoor Air Quality Testing

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BREEAM Indoor Air Quality Testing – Why It Matters

When it comes to creating healthy, comfortable buildings, indoor air quality is just as important as energy efficiency or acoustic performance. That’s why BREEAM places such a strong focus on ensuring the air inside a building is safe for the people who use it every day.

At APT Sound Testing, we’ve been carrying out BREEAM Indoor Air Quality (IAQ) testing for many years, helping developers, contractors, architects, and project managers achieve valuable BREEAM credits while ensuring buildings meet the highest standards of indoor environmental quality.

Whether you need an Indoor Air Quality Plan, post-construction air quality testing, or expert advice throughout your project, our experienced team is here to make the process straightforward from start to finish.

What is BREEAM Indoor Air Quality Testing?

BREEAM Indoor Air Quality Testing is designed to assess the quality of the air within a newly completed building before it is occupied. The aim is simple – to minimise harmful pollutants and create healthier indoor environments for future occupants.

As part of the assessment, we test for key airborne contaminants, including:

  • Total Volatile Organic Compounds (TVOCs)
  • Formaldehyde

If required, we can also test for additional pollutants depending on your project’s specific requirements.

The Two Stages of BREEAM Hea02

To achieve the available BREEAM credits under the Hea02 category, there are two important stages.

Stage 1 – Indoor Air Quality Plan (IAQP)

The first step is producing an Indoor Air Quality Plan during the design stage of your project.

This plan helps reduce the risk of poor indoor air quality by considering factors such as ventilation strategies, construction methods, building materials, and future maintenance. By identifying potential sources of contamination early, your project can be designed to provide a healthier environment for everyone who will use the building.

Our bespoke Indoor Air Quality Plans typically include:

  • Advice on identifying and removing contamination sources
  • Recommendations for controlling and diluting airborne pollutants
  • Pre-occupancy flush-out procedures
  • A practical checklist to prepare for third-party testing
  • Guidance on maintaining good indoor air quality after occupation
  • Independent testing and analysis

Stage 2 – Post-Construction Indoor Air Quality Testing

Once construction is complete and the building’s HVAC system is fully operational, it’s time for the post-construction Indoor Air Quality Test.

During our site visit, we collect air samples from representative occupied spaces, such as offices, classrooms, healthcare facilities, apartments, or other regularly occupied rooms.

The samples are analysed to measure pollutant levels against the limits specified by BREEAM. If any readings exceed the required thresholds, we’ll explain the findings clearly and recommend practical steps to help bring the building into compliance.

Why Choose APT Sound Testing?

We’ve helped clients across the UK successfully achieve BREEAM, Home Quality Mark (HQM), and other environmental compliance standards through reliable, accurate Indoor Air Quality Testing.

When you work with APT Sound Testing, you can expect:

  • Experienced, qualified testing engineers
  • Fixed, competitive quotations with no hidden surprises
  • Helpful pre-test guidance to maximise the chances of success
  • Testing carried out strictly in accordance with BREEAM Hea02 requirements
  • Fast, clear reporting and expert technical advice

We understand that preparation is often the key to achieving compliance, which is why we’re always happy to provide practical advice before we even arrive on site.

Preparing for Your Air Quality Test

A successful Indoor Air Quality Test starts with good preparation. Our team provides a comprehensive checklist to ensure your building is ready before testing begins, helping to avoid unnecessary delays or repeat visits.

If you’re planning a BREEAM assessment, we’d be happy to provide our Indoor Air Quality Testing Checklist to help your project stay on track.

Need BREEAM Indoor Air Quality Testing?

If you’re looking for a trusted partner to carry out your BREEAM Indoor Air Quality Testing, APT Sound Testing is here to help.

From creating your Indoor Air Quality Plan to completing post-construction testing and reporting, we’ll guide you through every stage of the process with friendly advice and professional support.

Get in touch with our team today on 01525 303905 or email info@aptsoundtesting.co.uk to discuss your project. Alternatively, visit our Contact page to request a quotation.

Air Tightness Testing
Air Tightness Testing: Improving Building Performance

Air Tightness Testing: Improving Building Performance

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Expert Air Tightness Testing Across the UK

APT Sound Testing provides professional Air Tightness Testing services throughout the United Kingdom, supporting projects of all sizes — from individual residential properties to large-scale commercial developments.

As one of the few companies in the UK accredited by UKAS to undertake both Air and Sound Testing, we provide a complete testing solution that helps clients achieve Building Regulations compliance efficiently. Our experienced engineers can complete Air Tightness, Sound Insulation and Ventilation Testing packages during the same visit, improving site coordination while reducing costs.

Unlike many testing companies, we do not subcontract our work. Every project is completed by our own highly skilled and accredited engineers, ensuring consistent quality, reliability and expert advice from start to finish.

Why is Air Tightness Testing Required?

Air Tightness Testing became a legal requirement in England and Wales in 2006 under Building Regulations Part L, which focuses on the conservation of fuel and power.

Today, airtightness testing plays an increasingly important role in creating energy-efficient, low-carbon buildings. Poor airtightness allows uncontrolled air leakage through gaps and cracks in the building fabric, resulting in unnecessary heat loss, increased energy consumption and higher carbon emissions.

Building Regulations define air leakage as the uncontrolled movement of air through the gaps and openings within a building’s structure. In everyday terms, this is what we commonly experience as draughts.

By reducing unwanted air leakage, buildings can retain heat more effectively, improve energy performance and provide a more comfortable environment for occupants.

Understanding Air Leakage Rates and Building Performance

When energy is lost through uncontrolled air movement, it contributes to the building’s overall emission rate. New developments must achieve specific air leakage targets to comply with Building Regulations.

For a typical residential property, the target air permeability rate is often around:

5.0m³/hr/m²

For commercial buildings, requirements are usually more demanding, with target rates commonly around:

3.0m³/hr/m² or lower

Achieving these targets requires careful consideration of the building’s air barrier from the early design stage through to construction completion.

The Risks of Poor Airtightness

Air leakage affects buildings throughout the year.

Where air enters a building through uncontrolled gaps (infiltration), air usually escapes elsewhere (exfiltration). These unwanted air movements can create a number of problems:

Increased Energy Costs

Air leaking from a building envelope causes additional energy demand because replacement air must be heated or cooled. Air Tightness Testing helps identify leakage rates, allowing designers and building owners to better understand energy performance and optimise heating and cooling systems.

Condensation, Damp and Mould Problems

In winter, warm moist indoor air can escape through gaps in the building fabric and enter colder areas such as wall cavities and roof spaces. This can lead to condensation, mould growth and, over time, timber decay or structural damage.

Reduced Occupant Comfort

Draughts can significantly affect the comfort of people using a building. Cold air entering offices, homes or commercial spaces can create uncomfortable conditions and reduce occupant satisfaction.

APT Sound Testing has investigated buildings where excessive air leakage caused serious workplace comfort issues. In one case, a building recorded an air leakage rate of 25m³/hr/m². After leakage paths were identified and remedial works completed, the building achieved a result below 5m³/hr/m², significantly improving performance.

Increased Risk of External Pollutants Entering Buildings

Uncontrolled air leakage can also allow pollutants from outside to enter a building, including emissions from nearby roads, fuel stations, waste areas, restaurants and other external sources.

A well-designed and properly installed air barrier helps control airflow, improve indoor air quality and reduce the risk of unwanted pollutants entering occupied spaces.

How Does Air Tightness Testing Work?

Air Tightness Testing is commonly carried out using a blower door test.

During the test, specialist equipment measures:

  • The amount of air moving into or out of the building
  • The pressure difference across the building envelope
  • The overall air leakage rate

Where leakage is detected, our engineers can use techniques such as smoke testing to accurately locate air leakage paths.

Many buildings do not fail because of one obvious opening; instead, the main issues are often caused by multiple smaller gaps throughout the construction. Identifying these areas early allows corrective action to be taken before final compliance testing.

Air Tightness Consultancy and Design Support

APT Sound Testing provides expert air tightness consultancy from the earliest design stages through to final completion testing.

Our team works with architects, developers, contractors and building professionals to help:

  • Review building designs and air barrier strategies
  • Identify potential leakage risks
  • Provide guidance during construction
  • Reduce the likelihood of failed air tests
  • Achieve Building Control approval

As air tightness targets continue to become more demanding, early consideration of the building’s air leakage line is essential.

By working with us throughout the design and construction process, we can help ensure that airtightness requirements are achieved efficiently and cost-effectively.

Combined Air and Sound Testing Packages

Many of our clients choose our combined testing packages because our engineers are accredited to carry out both Air Tightness and Sound Testing.

Our multi-skilled team allows multiple compliance tests to be completed during one coordinated visit, providing:

  • Reduced project costs
  • Improved site scheduling
  • Less disruption for contractors
  • Faster completion of compliance requirements

We can also provide out-of-hours testing, including weekend appointments, to minimise disruption to working sites and occupied buildings.

Preparing for Your Air Tightness Test

To achieve a successful result, preparation is essential.

We recommend that developers and contractors consider airtightness requirements early and ensure that all elements of the air barrier are correctly installed before testing.

Our team can provide advice and guidance throughout your project, and we offer an air tightness checklist to help you prepare for your test.

Why Choose APT Sound Testing?

APT Sound Testing has extensive experience delivering successful air tightness tests across London and throughout the UK.

Our team understands the requirements of Approved Document L and has completed thousands of tests across a wide range of residential and commercial developments.

With expert advice, UKAS accreditation and a commitment to quality, we help clients achieve compliance while improving the energy efficiency and performance of their buildings.

Contact APT Sound Testing

If you need professional Air Tightness Testing, consultancy or compliance support, our experienced team is ready to help.

📞 01525 303905
📧 info@aptsoundtesting.co.uk

Contact APT Sound Testing today to discuss your project requirements and discover how our specialist air testing services can help you achieve compliance and improve building performance.

Thermal Imaging: Data Centres
Thermal Imaging: Essential for Modern Data Centres

Thermal Imaging: Essential for Modern Data Centres

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Why Thermal Imaging Is Essential for Modern Data Centres

In a world where data centres are the backbone of business operations, organisations increasingly rely on ever-increasing computing power; server rack densities continue to rise, placing greater demands on electrical infrastructure and cooling systems. The result is higher energy consumption, increased maintenance requirements, and a greater risk of equipment failure.

Many facilities managers are also unaware that failing to carry out regular electrical thermal imaging inspections of critical assets could affect their building insurance. Some insurers require evidence of routine thermographic inspections as part of a proactive maintenance programme, particularly for high-risk electrical installations. If a fire or major electrical failure occurs, the absence of these inspections may impact an insurance claim.

Thermal imaging has evolved from being a specialist diagnostic tool into an essential part of modern data centre maintenance. By identifying hidden heat-related issues before they become costly failures, infrared thermography helps improve reliability, maximise uptime, and support energy-efficient operations.

Complete Visibility of Data Centre Heat Patterns

Unlike traditional temperature sensors, which only monitor individual points, thermal imaging provides a complete visual map of temperatures across an entire facility. Engineers can instantly assess the thermal condition of server racks, electrical distribution boards, UPS systems, switchgear, cooling equipment, and cable connections.

This comprehensive view makes it possible to identify developing hotspots long before they trigger alarms or lead to equipment failure. A blocked air vent, overloaded circuit, loose electrical connection or failing cooling fan can all generate abnormal heat that would otherwise remain undetected.

Early identification enables maintenance teams to resolve issues before they affect critical operations.

Preventing Costly Downtime

Heat is one of the biggest threats to data centre reliability.

Even relatively small increases in operating temperature can accelerate component wear, shorten equipment lifespan and reduce overall performance. In more serious cases, overheating can cause servers to throttle performance, shut down unexpectedly or suffer catastrophic hardware failure.

For organisations that depend on continuous availability, unplanned downtime can result in significant financial losses, reputational damage and disruption to critical services.

Routine thermal imaging inspections allow potential failures to be identified at an early stage, enabling corrective action before problems escalate into costly outages.

Supporting Predictive Maintenance

Thermal imaging is a key component of an effective predictive maintenance strategy.

By carrying out regular inspections and comparing thermal images over time, maintenance teams can monitor temperature trends and identify gradual deterioration before equipment fails.

This proactive approach helps organisations to:

  • Schedule repairs before failures occur
  • Reduce emergency call-outs
  • Extend the lifespan of critical electrical assets
  • Improve operational reliability
  • Minimise business disruption

Rather than reacting to failures, facilities teams can plan maintenance activities around operational requirements, reducing both costs and risk.

Improving Cooling Efficiency and Reducing Energy Costs

Cooling systems account for a significant proportion of a data centre’s energy consumption.

Thermal imaging helps operators optimise cooling performance by identifying:

  • Hotspots within server racks
  • Over-cooled areas wasting energy
  • Airflow imbalances
  • Recirculation zones
  • Inefficient cooling distribution

Addressing these issues not only reduces energy consumption but also improves Power Usage Effectiveness (PUE), lowers operating costs and supports sustainability objectives.

From Reactive Maintenance to Proactive Asset Management

The real value of thermal imaging lies in its ability to transform maintenance strategies.

Instead of waiting for alarms, equipment failures or unexpected outages, operators gain continuous insight into the thermal condition of their critical infrastructure. This enables informed decision-making, reduces operational risk and helps maintain maximum system availability.

As demand for computing power continues to grow, thermal imaging is no longer simply a troubleshooting tool—it has become a strategic asset for improving resilience, reliability and long-term operational performance across the entire data centre.

Why Choose APT for Data Centre Thermal Imaging?

At APT, every thermal imaging survey follows a structured process designed to deliver accurate, consistent and actionable results.

We begin with a detailed consultation to understand your facility, operational priorities and critical assets. A pre-survey site assessment enables us to identify potential access requirements, optimise inspection routes and ensure maximum survey efficiency.

Our data centre thermal imaging inspections include:

  • ITC-trained Level 3 Thermographer
  • High-resolution FLIR T-Series thermal imaging cameras (640 × 480)
  • 100% thermal coverage of all accessible electrical assets
  • Detailed fault analysis with infrared and digital images
  • Thermal indexing calculations where applicable
  • Root cause analysis and practical remedial recommendations
  • Asset inventory and equipment elevation references
  • Comprehensive electronic report delivered within 24 hours

Our reports are designed to help facilities managers prioritise maintenance, reduce operational risk and demonstrate compliance with insurer and maintenance requirements.

Contact APT

If you’d like to learn more about our specialist thermal imaging services for data centres, we’d be happy to help.

📞 01525 303905
📧 info@aptsoundtesting.co.uk

Contact APT today to discuss your data centre thermal imaging requirements and discover how proactive thermographic inspections can help protect your critical infrastructure.

BS 8233 Planning Noise Surveys
BS 8233 Planning Noise Surveys

BS 8233 Planning Noise Surveys

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BS 8233 Planning Noise Surveys & Your Building Project

If you’re developing a new residential scheme, converting an existing building, or refurbishing a property, achieving compliance with BS 8233:2014 is often a key part of securing planning approval and creating comfortable living environments.

BS 8233 provides practical guidance on controlling noise in and around buildings. It helps architects, developers, planners, and acoustic consultants design buildings that achieve appropriate internal noise levels while minimising the impact of external noise sources.

In this guide, we’ll explain what BS 8233 covers, why planning authorities require noise assessments, and how APT Sound Testing can help you achieve compliance.

What is BS 8233?

BS 8233:2014 – Guidance on Sound Insulation and Noise Reduction for Buildings provides recommendations for acoustic design in residential and other noise-sensitive developments.

The standard covers:

  • External environmental noise entering buildings
  • Internal sound insulation between rooms and dwellings
  • Building services noise
  • General acoustic design principles

As the standard states:

“Noise control in and around buildings is discussed on an objective and quantifiable basis.”

This ensures that acoustic design is based on measurable performance rather than subjective opinion.

Which Projects Require BS 8233 Assessments?

BS 8233 is commonly applied to:

  • New residential developments
  • Apartment blocks
  • Housing estates
  • Refurbishment projects
  • Office-to-residential conversions
  • Change-of-use developments
  • Mixed-use schemes

The standard does not generally apply to specialist spaces such as cinemas, theatres, concert halls or auditoria, which require more specific acoustic guidance.

The BS 8233 Design Process

Successful acoustic design starts early in the planning process. BS 8233 recommends a structured six-stage approach:

  1. Site noise assessment
  2. Setting internal noise criteria
  3. Façade and ventilation design
  4. Internal sound insulation
  5. Noise mitigation measures
  6. Quality control and verification

By considering noise at the design stage, costly redesigns and planning delays can often be avoided.

At APT Sound Testing, we support clients throughout the entire process—from initial site surveys through to acoustic design advice and final sound testing.

External Noise Assessments

One of the primary requirements of BS 8233 is assessing environmental noise affecting a proposed development.

Typical noise sources include:

  • Road traffic
  • Railways
  • Aircraft
  • Industrial operations
  • Construction activity
  • Wind farms

An acoustic consultant will measure existing noise levels and determine whether mitigation measures such as enhanced glazing, acoustic ventilation or building layout changes are required.

BS 8233 also notes that façade reflections can typically increase measured noise levels by 1–2 dB, which should be considered during the design process.

Recommended Internal Noise Levels

The standard provides target internal noise levels designed to promote comfort and restful living.

Recommended daytime and night-time noise levels include:

RoomRecommended Internal Noise Level
Living rooms35 dB LAeq
Bedrooms30 dB LAeq
Dining rooms40 dB LAeq

These criteria form the basis of most planning noise assessments carried out across the UK.

Internal Sound Insulation

BS 8233 also highlights the importance of controlling noise transmission within buildings.

Good acoustic performance depends on:

  • Airborne sound insulation
  • Impact sound insulation
  • Controlling flanking transmission
  • High-quality construction and workmanship

As the standard explains:

“Flanking transmission can significantly reduce the overall sound insulation performance.”

This is why careful detailing and quality installation are just as important as selecting the correct building materials.

APT Sound Testing provides pre-completion sound testing and acoustic design advice to help developers achieve compliance with Approved Document E.

Building Services Noise

Mechanical and electrical services can significantly affect occupant comfort if not properly designed.

BS 8233 includes guidance for controlling noise from:

  • Ventilation systems
  • Air-conditioning units
  • Pumps
  • Boilers
  • Lifts
  • Plant equipment

Well-designed building services reduce the risk of future noise complaints and help ensure planning conditions are satisfied.

Why Choose APT Sound Testing?

With more than 22 years of specialist acoustic experience, APT Sound Testing provides practical, reliable advice for developments of every size.

Our services include:

  • BS 8233 residential noise assessments
  • BS 4142 industrial noise surveys
  • Environmental noise surveys
  • Acoustic design advice
  • Pre-completion sound insulation testing
  • Building services noise assessments
  • Part E compliance testing

Why clients choose us:

  • UKAS-accredited acoustic consultancy
  • Over 22 years of experience
  • Nationwide coverage
  • Fast turnaround times
  • Detailed, practical reporting
  • Contractor-friendly acoustic advice

About APT Sound Testing

APT Sound Testing is a UKAS-accredited acoustic consultancy specialising in residential, commercial and industrial acoustics throughout the UK.

We provide:

  • BS 8233 Residential Noise Assessments
  • BS 4142 Industrial Noise Surveys
  • Environmental Noise Assessments
  • Sound Insulation Testing
  • Acoustic Design Services
  • Part E Compliance Testing

Using the latest UKAS-calibrated Norsonic Class 1 sound level meters, our experienced consultants deliver accurate, fully compliant acoustic assessments that satisfy planning authorities, building control officers and developers alike.

Whether you’re working on a single dwelling or a large residential development, we provide practical advice that helps projects progress smoothly from planning through to completion.

Contact APT Sound Testing

If you require a BS 8233 planning noise survey, acoustic design advice or sound insulation testing, our experienced team is here to help.

APT Sound Testing

Telephone: 01525 303905 / 07775 623464

Email: info@aptsoundtesting.co.uk

Website: https://aptsoundtesting.co.uk

BS8233 Noise Assessments
BS8233 Noise Assessments: A Technical Guide

BS8233 Noise Assessments: A Technical Guide

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BS8233 Noise Assessments – A Complete Technical Guide for Planning & Building Compliance

  1. Introduction to BS8233

BS 8233:2014 is one of the most widely used acoustic standards in UK planning and building design. It provides detailed guidance on noise control in and around buildings, including external noise intrusion, internal sound insulation, building services noise and general acoustic design principles. For any development located near transport routes, commercial premises or industrial activity, a BS8233 noise assessment is typically required by the local planning authority.

The standard emphasises that noise control should be approached on an objective and quantifiable basis, stating:

“Noise control in and around buildings is discussed… on an objective and quantifiable basis as far as is currently possible.”(BS8233:2014, Introduction)

This article provides a complete technical breakdown of BS8233 noise assessments, how they are carried out, what they must include, and how APT Sound Testing ensures full compliance for planning and building control.

2. What Is a BS8233 Noise Assessment?

A BS8233 noise assessment evaluates external noise levels at a development site and determines the acoustic measures required to achieve the recommended internal noise criteria set out in BS 8233:2014. These criteria apply to:

  • Living rooms
  • Bedrooms
  • Dining rooms
  • Home offices
  • Hotel rooms
  • Healthcare spaces
  • Education buildings

The standard provides recommended internal noise levels for dwellings (Table 4), including:

  • Living rooms: 35 dB LAeq,16hr
  • Bedrooms: 30 dB LAeq,8hr
  • Dining rooms: 40 dB LAeq,16hr

These values form the backbone of most planning conditions relating to noise.

For a deeper dive, see BS8233 noise assessments.

3. When Is a BS8233 Noise Assessment Required?

Local authorities typically request a BS8233 noise assessment when:

  • A development is near a busy road
  • The site is close to a railway line
  • Aircraft noise is present
  • There are industrial or commercial noise sources nearby
  • A change of use introduces noise‑sensitive rooms
  • A planning condition explicitly requires a BS8233 noise report

APT provides nationwide noise surveys:https://aptsoundtesting.co.uk/noise-surveys/   

4. The Structure of BS 8233:2014

BS 8233 is divided into several key sections relevant to noise assessments:

  • Clause 5: Planning and design
  • Clause 6: External noise sources
  • Clause 7: Indoor ambient noise criteria
  • Clause 8: Sound insulation in buildings
  • Clause 9: Noise from building services
  • Annexes A–H: Calculations, NR curves, insulation indices, legislative context, worked examples

The standard is intended for use by non‑specialist designers, but in practice, most assessments require an experienced acoustic consultant due to the technical modelling involved.

5. What a BS8233 Noise Assessment Includes

A compliant BS8233 noise assessment typically contains the following components:

5.1 Baseline Noise Survey

A detailed noise survey is carried out at the development site, usually over a 24‑hour period. Measurements include:

  • LAeq,T
  • LAmax
  • LA10 / LA90
  • Diurnal variations
  • Façade vs free‑field corrections

BS 8233 notes: “Facade level measurements… are typically 1 dB to 2 dB higher than corresponding free‑field measurements.”
(BS8233:2014, 3.1.10)

This correction is essential when designing façade performance.

5.2 Façade Noise Modelling

Using measured data, we calculate the required performance of:

  • External walls
  • Glazing systems
  • Ventilation strategy
  • Building orientation
  • Acoustic trickle vents or MVHR systems

This modelling ensures internal noise levels meet BS8233 criteria with windows closed, as required by planning authorities.

APT’s façade and ventilation design service: https://aptsoundtesting.co.uk/acoustic-design-service/

5.3 Ventilation Strategy Review

BS 8233 requires internal noise levels to be met without relying on open windows. Therefore, the ventilation system must provide:

  • Background ventilation
  • Overheating mitigation
  • Compliance with Approved Document F
  • Acceptable internal noise levels

This is often the most challenging part of the assessment, especially on noisy sites.

5.4 Internal Layout Review

We assess room placement to minimise noise exposure:

  • Bedrooms placed away from noise sources
  • Non‑habitable rooms used as acoustic buffers
  • Optimised building massing
  • Courtyard layouts to reduce façade exposure

This aligns with BS8233 Clause 5.2 on assessing the building or site.

5.5 Compliance Statement

The final report confirms whether the development meets BS8233 criteria and details any required mitigation, such as:

  • Enhanced glazing
  • Acoustic vents
  • Mechanical ventilation
  • Acoustic barriers
  • Upgraded façade construction

APT specialises in designing cost‑effective, buildable solutions that satisfy planning without unnecessary overspecification.

6. External Noise Sources (Clause 6)

BS 8233 provides guidance on assessing noise from:

  • Road traffic
  • Aircraft
  • Railways
  • Industrial sources
  • Construction sites
  • Wind farms

It also highlights the importance of meteorological effects, façade reflections, and free‑field corrections.

APT’s external noise surveys: https://aptsoundtesting.co.uk/noise-surveys/   

7. Indoor Ambient Noise Criteria (Clause 7)

BS 8233 provides recommended internal noise levels for:

  • Dwellings
  • Offices
  • Schools
  • Healthcare
  • Hotels
  • Commercial spaces

These values are used to determine the required façade performance and ventilation strategy.

APT’s BS8233 service page: https://aptsoundtesting.co.uk/noise-surveys/bs8233-noise-assessments/  

8. Sound Insulation & Flanking (Clause 8)

BS 8233 discusses:

  • Airborne sound insulation
  • Impact sound insulation
  • Flanking transmission
  • Sound insulation testing
  • Performance of common building elements

It reinforces the importance of flanking control:

“Flanking transmission can significantly reduce the overall sound insulation performance.” (BS8233:2014, 8.2)

APT provides full acoustic detailing and Part E sound testing:
https://aptsoundtesting.co.uk/sound-testing/

9. Noise from Building Services (Clause 9)

BS 8233 covers noise from:

  • Mechanical ventilation
  • Air‑conditioning
  • Pumps
  • Lifts
  • Boilers
  • Ductwork noise
  • Fan noise
  • Vibration‑induced noise

Good design and installation are essential to avoid noise complaints.

APT provides building services noise assessments: https://aptsoundtesting.co.uk/noise-surveys/

10. Why BS8233 Noise Assessments Matter

A BS8233 noise assessment ensures:

  • Planning approval is achieved
  • Residents experience acceptable internal noise levels
  • Complaints and future disputes are avoided
  • The development complies with national guidance
  • Façade and ventilation systems are correctly specified
  • Internal layouts are optimised for acoustic comfort

APT integrates BS8233 into all noise surveys, acoustic design reports and sound insulation strategies.

11. Why Choose APT Sound Testing?

  • UKAS‑accredited company
  • 22+ years’ experience
  • Nationwide coverage
  • Fast reporting
  • Detailed acoustic design
  • Contractor‑friendly guidance
  • Full support for BS8233, BS4142, Part E, BB93 & HTM 08‑01

APT’s dedicated BS8233 page: https://aptsoundtesting.co.uk/noise-surveys/bs8233-noise-assessments/

About APT Sound Testing

APT Sound Testing is a UKAS‑accredited acoustic consultancy with over 22 years’ specialist experience in building acoustics, environmental noise assessment, BS8233 Residential Noise Assessments, BS4142 industrial noise surveys, sound insulation testing and Part E compliance. We support residential, commercial and industrial developments across the UK, providing fast, accurate and fully compliant acoustic testing and reporting.

Our team combines deep technical expertise with practical, contractor‑friendly guidance to help clients achieve full compliance with Approved Document E, BS8233, BS4142, BB93, HTM 08‑01 and wider planning and building control requirements. Whether you need pre‑completion sound testing, noise impact assessments, acoustic design advice or troubleshooting for difficult sites, we deliver reliable results with a rapid turnaround.

Contact Us Now

APT Sound Testing
T: 07775 623464
E: info@aptsoundtesting.co.uk  
W: https://aptsoundtesting.co.uk

PAS 2035 Air Tightness Testing
PAS 2035 Air Tightness Testing

PAS 2035 Air Tightness Testing

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Common Air Leakage Paths: PAS 2035 Air Tightness Testing

One of the key observations from our extensive experience in air tightness testing is that the more complete a development is at the time of testing, the more likely it is to achieve a low air leakage result.

To help our clients prepare, we provide a comprehensive Air Leakage Checklist alongside every quotation. By engaging with projects throughout the retrofit process, we can offer practical advice and guidance on the most effective ways to minimise air leakage and achieve PAS 2035 Compliance first time.

Most Common Air Leakage Paths We Identify

During air tightness and smoke leakage testing, we frequently identify air leakage from:

• Poorly installed windows and doors that do not seal correctly against frames
• Missing or damaged window and door seals
• Faulty or damaged trickle vents
• Gaps at wall and skirting board junctions
• Gaps through existing floorboards on all levels
• Perimeter and internal wall-to-floor junctions
• Service penetrations for electrical, plumbing and mechanical installations
• Ceiling voids connecting to masonry cavity walls
• Eaves and roof cavity pathways
• Gaps around window sills and door reveals
• Bathroom and WC service penetrations
• Kitchen and utility service penetrations
• Gaps between dry lining systems and ceilings
• Unsealed chimneys and fireplaces
• Electrical, data and IT installations
• Loft hatches and access panels
• Ventilation penetrations through walls, roofs and ceilings
• Poorly installed extractor fans in kitchens, utilities and bathrooms

Failed an Air Tightness Test?

If your building doesn’t achieve the required result, there is no need to panic.

Our smoke leakage testing service can accurately identify the source of air leakage throughout the building envelope. We provide a detailed smoke survey report, allowing your team to carry out targeted remedial sealing works before retesting.

How We Can Help

APT Sound Testing has extensive experience supporting PAS 2035 retrofit projects and helping clients achieve compliance with Approved Document L and air tightness requirements.

As a UKAS-accredited ISO/IEC 17025 testing laboratory, we specialise in on-site air tightness testing for commercial and large-scale developments. We are also an ATTMA Level 2 registered organisation, qualified to test Large, Complex and High-Rise (LCHR) buildings, as well as phased and zonal handover projects.

Using the latest UKAS-calibrated Retrotec blower door equipment, our engineers have successfully delivered thousands of air tightness tests across the UK, including landmark developments such as Battersea Power Station and the Imperial War Museum London.

Our combination of accredited competence, technical expertise and over 20 years of industry experience ensures reliable, repeatable and fully compliant testing on every project.

📞 Need help preparing for your PAS 2035 air tightness test?

Preparing for your PAS 2035 air tightness test? Contact the APT Team on 01525 303905 or email info@aptsoundtesting.co.uk to discuss your project and avoid costly delays or test failures.

BS8233 Noise Assessments
Why BS8233 Noise Assessments Fail

Why BS8233 Noise Assessments Fail

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Guidelines as to Why BS8233 Noise Assessments Might Fail

Many planning applications are delayed or refused because the submitted BS8233 noise assessment does not fully meet the required planning conditions. This is often avoidable with the right approach, yet the same technical and reporting issues continue to appear across developments.

In this article, we break down the most common reasons BS8233 noise assessments fail, and how to avoid them, so your application has the best chance of approval first time.

A BS8233 noise assessment is a key requirement for many residential and mixed-use schemes. When completed correctly, it demonstrates that internal noise levels will comply with the guidance set out in BS 8233:2014, ensuring acceptable living conditions inside proposed dwellings.

When these assessments fall short, the consequences can include planning delays, redesign costs, or outright refusal.

1. Inadequate baseline noise monitoring

One of the most common reasons for failure is insufficient or unrepresentative baseline noise data.

Typical problems include:

  • Monitoring periods that are too short
  • Missing worst-case daytime or night-time conditions
  • Failure to capture LAmax noise events
  • Poor microphone positioning
  • Use of non-calibrated or incorrect class instrumentation

Local authorities expect robust, representative surveys carried out using UKAS-calibrated Class 1 equipment and appropriate methodology.

Further guidance: BS8233 Noise Surveys

2. Misapplication of BS8233 internal noise criteria

Another frequent issue is the incorrect interpretation of internal noise limits.

Common mistakes include:

  • Applying daytime criteria to bedrooms at night
  • Overlooking LAmax requirements
  • Using outdated or incorrect guidance thresholds
  • Failing to distinguish between room functions (e.g. living rooms vs bedrooms vs studies)

Each room type must be assessed against the correct internal noise targets to demonstrate compliance.

Learn more: BS8233 Noise Assessment Guide

3. Incorrect façade and glazing calculations

Even where external noise data is accurate, assessments can still fail due to flawed façade modelling.

Typical issues include:

  • Using generic glazing assumptions instead of tested Rw performance values
  • Ignoring acoustic performance of ventilation openings
  • Overlooking flanking transmission paths
  • Underestimating required façade insulation performance

A compliant BS8233 assessment must consider the full building envelope, not just window specifications.

See guidance here:
Façade Noise Calculations

4. Ventilation strategies that conflict with BS8233

Ventilation design is one of the most common reasons for failure in modern developments.

Problems often include:

  • Trickle vents specified in high noise exposure areas
  • MVHR systems provided without acoustic performance data
  • Reliance on open-window scenarios that are unrealistic for occupants
  • Conflicts between ventilation and overheating requirements

If ventilation pathways are not acoustically controlled, internal noise targets cannot be achieved.

Further reading: Acoustic Ventilation Strategies

5. Failure to consider LAmax night-time events

Many assessments focus only on LAeq values and overlook LAmax noise events, which are critical for sleep protection.

This is particularly important near:

  • Rail corridors
  • Flight paths
  • Major road networks
  • Industrial sites with impulsive or intermittent noise sources

Even where average noise levels comply, excessive LAmax events can lead to refusal on residential amenity grounds.

6. Weak or non-specific mitigation measures

Planning officers expect clear, actionable mitigation—not generic statements.

Common shortcomings include:

  • Vague glazing upgrade recommendations
  • Missing ventilation specifications
  • No treatment of external amenity areas (balconies, gardens, terraces)
  • Lack of design integration with architectural layout

A robust report should provide practical, buildable solutions that can be directly incorporated into the design.

7. Reports that do not meet planning documentation standards

Even technically sound assessments can fail if the report itself is not presented properly.

Typical issues include:

  • Lack of clarity or structure
  • Missing reference to relevant standards and guidance
  • No justification for assumptions used
  • Absence of calibration certificates or measurement logs
  • Incomplete supporting data

Planning authorities require transparent, well-evidenced reporting that can be independently verified.

Further reading on BS8233 and planning acoustics

To strengthen your understanding of BS8233 assessments and related planning requirements, the following resources may help:

Need help with a BS8233 noise assessment?

If you need support with a new BS8233 assessment, or if your report has been rejected by a local authority, APT Sound Testing provides UKAS-accredited acoustic consultancy services across England.

📞 Call APT Sound Testing: 07775 623464
📧 Email: info@aptsoundtesting.co.uk
🌐 Website: APT Sound Testing

Fast, compliant BS8233 assessments can help reduce delays and keep planning applications moving forward.

BS8233 Planning Noise Assessments
BS8233 Planning Noise Assessments

BS8233 Planning Noise Assessments

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BS8233 Internal Noise Level Criteria & Acoustic Design Guidance

When discussing planning noise assessments, many developers focus on obtaining planning approval and satisfying local authority requirements. However, achieving compliance with BS8233:2014 goes far beyond submitting a noise report. The real challenge is ensuring that future occupants enjoy acceptable internal noise levels once the building is occupied.

BS8233:2014 provides essential guidance on internal noise criteria, façade design, glazing performance, ventilation strategies, and acoustic design for residential and mixed-use developments. Understanding these requirements at an early stage can help avoid costly redesigns, planning delays, and compliance issues later in the project.

This guide explains the internal noise criteria contained within BS8233, how they are assessed, and what developers, architects, and planning consultants should consider when designing buildings in challenging acoustic environments.

What Does BS8233 Say About Internal Noise Levels?

BS8233 sets recommended internal noise limits for a range of residential spaces, including:

  • Living rooms
  • Bedrooms
  • Dining areas
  • Home offices and study rooms

These criteria are intended to provide comfortable living conditions and protect residents from excessive noise generated by:

  • Road traffic
  • Railways
  • Aircraft
  • Industrial operations
  • Commercial premises
  • Other environmental noise sources

The standard provides guidance on:

  • Recommended daytime and night-time LAeq noise levels
  • Maximum LAmax levels within bedrooms
  • Acoustic performance requirements for façades and glazing
  • Ventilation strategies that maintain internal acoustic comfort
  • Noise mitigation measures for new developments

For a broader overview of how BS8233 is applied during the planning process, see our guide to BS8233 Noise Surveys for New Developments.

Why Internal Noise Criteria Matter in Planning Noise Assessments

Local planning authorities frequently require BS8233-compliant noise assessments for:

  • New residential developments
  • Mixed-use developments
  • Permitted Development conversions
  • Sites located near major transport routes
  • Developments affected by commercial or industrial noise sources

While a noise survey may satisfy a planning condition, demonstrating compliance with BS8233 internal noise criteria is what ultimately determines whether a development is suitable for residential occupation.

Failure to achieve the recommended internal noise levels can result in planning objections, additional mitigation requirements, or costly design changes later in the project.

How Are Internal Noise Levels Assessed?

To demonstrate compliance with BS8233, acoustic consultants typically undertake a detailed assessment process that includes:

Measuring External Noise Levels

Environmental noise measurements are carried out to establish existing site conditions and identify dominant noise sources.

Assessing Façade Exposure

The most exposed elevations of the proposed development are identified to determine worst-case noise scenarios.

Calculating Sound Insulation Requirements

Acoustic calculations are performed to establish the level of façade sound insulation required to achieve acceptable internal noise levels.

Specifying Glazing and Ventilation Systems

Appropriate glazing specifications and ventilation strategies are selected to balance acoustic performance with building regulations and occupant comfort.

Predicting Internal Noise Levels

Using recognised BS8233 methodologies, consultants model internal noise levels within the proposed building to demonstrate compliance with the recommended criteria.

This process forms a key part of a comprehensive BS8233 Noise Assessment and is often supported by wider planning noise surveys where local authority or World Health Organisation (WHO) guidance also applies.

Common Mitigation Measures for BS8233 Compliance

Where external noise levels exceed recommended limits, a range of mitigation measures may be required.

Typical solutions include:

  • Enhanced acoustic double glazing
  • Triple glazing systems
  • Acoustic trickle ventilators
  • Mechanical Ventilation with Heat Recovery (MVHR)
  • Acoustic louvres and attenuators
  • Improved façade construction
  • Strategic room layouts and building orientation

The most effective solution will depend on the site’s specific noise environment, building design, and planning requirements.

Careful integration of façade design and ventilation systems is essential to ensure internal noise targets are achieved without compromising occupant comfort or energy efficiency.

The Importance of Early Acoustic Design

One of the most common issues encountered during planning is the late consideration of noise mitigation requirements.

By engaging an acoustic consultant during the early design stages, developers can:

  • Identify potential noise constraints before submitting a planning application
  • Reduce the risk of planning delays
  • Optimise glazing and ventilation specifications
  • Minimise construction costs
  • Improve residential amenity and marketability

Early acoustic input often results in more efficient and cost-effective solutions than attempting to retrofit mitigation measures after planning conditions have been imposed.

Why Choose APT Sound Testing for BS8233 Compliance?

APT Sound Testing supports developers, architects, and planning consultants throughout the UK with professional acoustic consultancy and environmental noise assessments.

Our expertise includes:

  • BS8233 Noise Surveys
  • BS8233 Noise Assessments
  • Planning Noise Surveys
  • Façade Noise Calculations
  • Acoustic Ventilation Design
  • Environmental Noise Monitoring

Clients choose APT Sound Testing because:

  • UKAS-accredited laboratory services
  • UKAS-calibrated Norsonic Class 1 sound measurement equipment
  • More than 25 years of environmental noise assessment experience
  • Fast response times and nationwide coverage
  • Clear, planning-focused reports accepted by local authorities

Our consultants regularly undertake BS8233 assessments across London, the South East, and throughout the UK, supporting projects ranging from small residential conversions to large-scale multi-unit developments.

Contact APT Sound Testing

If you require a BS8233 noise survey, planning noise assessment, or acoustic design advice, our experienced team is ready to help.

Call Darren: 07775 623464
Email: info@aptsoundtesting.co.uk
Website: https://aptsoundtesting.co.uk

We provide fast, accurate, and fully UKAS-accredited acoustic consultancy services throughout England.

Why Work With Us?

  • Competitive pricing
  • Friendly, proactive service
  • Experienced acoustic consultants
  • UKAS and ISO accredited
  • Fast response times
  • Rapid report turnaround
  • Nationwide coverage
  • Complete pre-completion testing solutions

Contact our team today to discuss your project requirements and ensure your development meets BS8233 acoustic standards from the outset.

Smoke Shaft Testing
A Guide to Smoke Shaft Air Testing

A Guide to Smoke Shaft Air Testing

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Elevate Fire Safety Standards with Professional Smoke Shaft Air Testing

Smoke shaft air testing is a critical component of modern fire safety strategies, helping to ensure that smoke control systems perform effectively when they are needed most. In the event of a fire, smoke presents one of the greatest risks to building occupants, accounting for more than 60% of fire-related fatalities through smoke inhalation.

Our premium smoke shaft testing service includes:

  • Smoke shaft survey visits by experienced consultants
  • We are a UKAS and ATTMA Level 2 accredited air testing company
  • Smoke shaft air test certification to UKAS/ATTMA
  • The latest high-powered fan equipment
  • UKAS calibrated equipment.
  • The best diagnostic leakage service using smoke machines & thermal imaging.
  • Rapid testing service

At APT, we provide comprehensive smoke shaft air tightness testing and remediation services, helping developers, contractors, and building owners achieve regulatory compliance while safeguarding occupants and emergency responders.

Why Is Smoke Shaft Air Testing Important?

Smoke shafts are commonly incorporated into fire-engineered solutions for high-rise residential and commercial buildings. As a key element of a building’s smoke control system, the air tightness of the smoke shaft is essential to its performance.

During a fire, smoke shafts work alongside Automatic Opening Ventilation (AOV) systems to remove smoke from escape routes and common access areas. However, if the shaft is not sufficiently airtight, the effectiveness of the entire smoke control system can be compromised.

Most smoke shafts are required to achieve an air permeability target of approximately 3.8 m³/hr/m². Failure to meet this standard can prevent the smoke control system from being signed off by the fire system contractor or Building Control.

Expert Testing and Remediation Services

APT has extensive experience testing smoke shafts of all sizes across a wide range of developments. In addition to air tightness testing, we offer specialist diagnostic services for smoke shafts that fail initial testing.

Using a combination of:

  • Smoke testing
  • Thermal imaging surveys
  • Air leakage diagnostics

we can quickly identify air leakage pathways within the smoke shaft envelope.

Our findings are compiled into a detailed air leakage report, enabling contractors to carry out targeted remedial sealing works. This focused approach reduces unnecessary disruption and significantly increases the likelihood of achieving a pass during subsequent testing.

Why Undertake Air Testing for Smoke Shafts?

1. Compliance with Legislation and Standards

All buildings incorporating smoke shafts should undergo air tightness testing to demonstrate compliance with relevant standards and fire safety requirements, including:

  • BS 9991:2015 – Fire safety in the design, management and use of residential buildings
  • BS 9999 – Fire safety in the design, management and use of buildings

Testing provides evidence that the smoke shaft performs as intended and supports Building Control approval.

2. Improved Fire Safety

Smoke is often more dangerous than flames during a fire emergency. Effective smoke control systems help to:

  • Protect escape routes for occupants
  • Improve visibility during evacuation
  • Reduce exposure to toxic smoke
  • Assist firefighters during rescue and firefighting operations

Air tightness testing helps ensure that smoke shafts can effectively remove smoke and maintain safe evacuation conditions.

3. Verification of System Performance

Before AOV systems can be commissioned, the smoke shaft must demonstrate adequate airtightness. Testing verifies that the shaft can operate efficiently and deliver the required smoke extraction performance during an emergency.

Building Regulations and Smoke Shaft Standards

Smoke shaft design and testing requirements continue to evolve alongside changes in UK fire safety legislation.

For residential developments, BS 9991:2015 provides detailed guidance on smoke control systems and the role of smoke shafts in maintaining safe means of escape. Compliance with these standards is increasingly important, particularly in higher-risk residential buildings.

Professional testing provides documented evidence that a smoke shaft meets the required performance criteria and supports the building approval process.

How Often Should a Smoke Shaft Be Air Tested?

The frequency of smoke shaft testing depends on several factors, including building type, maintenance schedules, insurance requirements, and regulatory obligations.

New Buildings and Major Refurbishments

Newly installed smoke shafts should always undergo initial air tightness testing before commissioning. This confirms compliance and verifies that the system will perform effectively during a fire emergency.

Ongoing Maintenance and Periodic Testing

Following initial certification, smoke shafts should be regularly inspected and retested to ensure ongoing performance. As a general guideline, annual testing every 12 months is recommended.

Regular testing helps identify:

  • Deterioration of seals
  • Damage to the shaft structure
  • Unauthorised modifications
  • Air leakage that could affect system performance

Proactive maintenance ensures continued compliance and reliability throughout the building’s lifecycle.

Why Choose APT for Smoke Shaft Air Testing?

APT has successfully undertaken smoke shaft and AOV testing across London and the South East on a number of prestigious projects, including:

  • Battersea Power Station
  • Imperial War Museum
  • Claridge’s Hotel
  • The Berkeley Hotel

As one of the few companies accredited for both building air tightness testing and specialist smoke shaft testing, we offer a level of expertise that sets us apart.

Our accreditations include:

  • UKAS accreditation
  • ATTMA Level 2 accreditation

Whether you require compliance testing, diagnostic investigations, or remediation support, our experienced team can help ensure your smoke shaft achieves the required performance standards.

Contact APT

For more information about our smoke shaft (AOV) testing services or to request a copy of our smoke shaft testing checklist, contact APT today by calling 01525 303905 and speak with one of our specialists.

Indoor Air Quality Testing
BREEAM Indoor Air Quality Testing

BREEAM Indoor Air Quality Testing

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BREEAM Indoor Air Quality Testing

APT Sound Testing has been providing BREEAM indoor air quality testing services such as post-construction air quality testing and indoor air monitoring for a number of years. We have assisted many customers in gaining their BREEAM and other compliance credits through our air quality plan and BREEAM air quality testing services.

As well as helping you to gain your initial (BREEAM) credit, by testing the indoor air quality our engineering team are then able to produce a bespoke indoor air quality plan. Our plans are able to provide you with the following benefits:

  • Advice on removal of contaminant sources
  • Dilution and control of contaminant sources
  • Procedures for pre-occupancy flush-out
  • Informative checklist to help you prepare for the third party testing
  • Third party testing and analysis
  • Advice on maintaining Indoor Air Quality In-Use

Our Services to attain extra BREEAM points for Indoor Air quality under BREEAM Hea0

There are two defined stages for achieving extra points under BREEAM Hea02. The first stage is the air quality plan and the second stage is indoor quality testing. here is a quick explanantion for each stage.

Stage 1 – BREEAM Indoor Air Quality Plan
The BREEAM Indoor Air Quality Plan reduces the risk of health deterioration and building performance by improving indoor air quality for the end user. It makes assurances in the design stage of a project which plan for the existence of ventilation, equipment and construction materials which improve indoor air quality for the buildings occupiers.

Stage 2 – BREEAM Indoor Air Quality Testing
Your project must be nearing completion, including a fully operational HVAC system, before an Indoor Air Quality Test can be carried out. The sampling identifies the presence of volatile organic compounds (TVOCs), including formaldehyde.

Where the levels of these compounds are found to exceed the prescribed limits, to claim the BREEAM credit it must be identified that appropriate measures have or will be undertaken in accordance with the IAQP and the consultant’s report recommendations to reduce the levels to fall within the limits.

We can undertake all your BREEAM Indoor Air Quality Testing requirements

Here at APT Sound Testing, we have significant experience in carrying out post-construction Indoor Air Quality (IAQ) testing. We are familiar with the stringent methods that are specified under BREEAM Hea02, Home Quality Mark (HQM) and other compliance standards. Our team will always provide a firm quotation and helpful checklist to help you prepare for the testing, prior to us visiting site to carry out this work.

We will ensure that all post-construction testing is carried out to the relevant standard that you are looking to achieve as specifications do vary.

When undertaking Indoor Air Quality Testing for BREEAM, we will typically test for Formaldehyde and TVOC in the air but can easily include other pollutants if required. We will normally sample rooms which will be occupied for long periods of time, for instance offices, hospitals and offices. It is important to make sure that a sufficient number of these rooms are tested in order to gain the relevant credit.

Our tasked team will make sure that all post-construction air quality tests are carried out in accordance with the very exacting BREEAM Hea02 methods. Our expert team will also provide free advice and guidance to your project manager to help to create the correct environment for the air quality tests as we have found over this years this to be very important.

To help you prepare for your Post Construction Air quality testing, please download our Indoor Air Quality Checklist. Need to add a BREEAM Indoor Air Quality testing checklist

Call us on 01525 303905 or email us on info@aptsoundtesting.co.uk about our Indoor Air Quality Testing services. We are here to help! Alternatively, please visit our contact page here.