Thermal imaging, also known as thermography, is a non-invasive inspection technique that detects infrared radiation emitted by objects. While infrared energy is invisible to the human eye, thermal imaging cameras can capture it and convert it into colour-coded images that clearly display temperature variations across a surface.
These temperature differences allow thermal imaging surveys to identify hidden issues within a building, including:
Heat loss caused by damaged or missing insulation
Moisture intrusion resulting from water leaks or damp penetration
Electrical faults linked to overheating components or faulty wiring
Structural defects where compromised elements affect thermal performance
By highlighting thermal anomalies early, potential problems can be addressed before they develop into costly repairs.
Commercial Thermal Imaging Surveys
Our thermal imaging surveys for commercial buildings provide invaluable insight into the thermal performance of the building envelope, often at minimal cost. As a trusted provider, we are frequently the first point of contact for surveyors requiring reliable thermal imaging defect surveys.
An infrared survey can be used for much more than identifying heat loss, including:
Building energy efficiency – pinpointing where the greatest energy cost savings can be achieved
Damp walls, ceilings, and floors – detecting water ingress, sources of damp, flat roof leaks, and issues around roof lights
Water leaks – identifying leaks within building water systems
Thermal bridging – locating missing or ineffective insulation at door and window reveals, heads, and junctions
Missing or damaged insulation – highlighting cold spots caused by poor workmanship in walls, floors, and roofs
Air infiltration – identifying cold draughts entering through the building envelope
Excess air leakage paths – revealing warm air escaping, leading to wasted energy or difficulty keeping buildings cool in summer
Thermal Imaging House Surveys to Reduce Heat Loss
Our residential thermal imaging surveys offer homeowners a clear understanding of their property’s thermal performance. A thermal camera survey goes beyond simple heat loss detection and can also identify:
Energy efficiency issues – highlighting where improvements will deliver the greatest savings
Damp walls, ceilings, and floors – locating water ingress, chimney leaks, and flat roof defects
Water leaks – detecting leaks in underfloor heating systems or concealed pipework
Thermal bridging – identifying insulation gaps around doors and windows
Missing or damaged insulation – revealing cold spots caused by poor installation
Air infiltration – identifying uncomfortable draughts entering the property
Air leakage paths – locating warm air escaping through the building envelope
BREEAM Thermal Imaging Surveys
Thermal imaging surveys are a core requirement within BREEAM, the world’s leading environmental assessment and rating system for buildings. Both BREEAM New Construction and BREEAM Domestic Refurbishment schemes award credits for thermal imaging assessments carried out by certified thermographers.
For over a decade, APT Sound Testing has delivered professional BREEAM thermal imaging surveys to verify insulation continuity and compliance. Our surveys are undertaken by Level 3 certified thermographers, exceeding BREEAM requirements, and utilising high-resolution FLIR thermal imaging cameras to ensure precise, dependable results on every project.
How Thermal Imaging Improves Health & Safety
Thermal imaging significantly enhances health and safety by reducing the need for working at height, one of the leading causes of serious accidents in the construction and maintenance industries.
Key safety benefits include:
Remote inspections from ground level Inspections can be carried out safely without the need for ladders, scaffolding, or aerial platforms.
Early issue detection Identifying insulation failures, leaks, or electrical faults remotely allows maintenance to be planned efficiently and safely.
Improved safety planning Detailed thermal images help teams plan safer access methods when working at height is unavoidable.
Frequent monitoring without access equipment Regular surveys can be conducted without scaffolding, enabling early detection and reducing risk.
By incorporating thermal imaging into routine inspections, organisations can significantly reduce the need for extensive working-at-height surveys and lower the risk of falls.
Contact Us for Your Thermal Imaging Survey
Ready to uncover hidden issues and improve your building’s efficiency? Contact APT Sound Testing today to arrange your thermal imaging survey.
Protect your assets, improve indoor comfort, and enhance building performance with our professional thermal imaging surveys. Detect issues early and take informed action with confidence.
Preparing Your Smoke Shaft for an Air Tightness Test
Elevate fire safety standards with comprehensive air tightness testing and remediation. Accredited Air Pressure Testing (APT) solutions help you meet regulatory requirements, improve smoke control performance, and protect building occupants.
Ensuring the safety and compliance of smoke shafts is a critical component of any building’s fire safety strategy. Smoke shafts are designed to restrict the spread of smoke and heat during a fire, protecting escape routes and supporting effective evacuation.
To confirm they perform as intended, air tightness testing is essential. Proper preparation can significantly increase the likelihood of passing the test first time and avoiding costly remedial works.
Top 10 Ways to Prepare a Smoke Shaft for Air Tightness Testing
Consult Smoke Shaft Testing Experts Early Engage air tightness consultants who specialise in smoke shaft testing at an early stage. Their expertise can guide effective design decisions, detailing, and sealing strategies.
Set Clear Airtightness Targets Establish the required airtightness performance—typically less than 3.8 m³/h/m² @ 50 Pa. Be aware that some smoke shafts may require different targets, so always confirm the specification in advance.
Use Robust Construction Materials Construct the shaft using materials capable of forming an effective air barrier, such as in-situ concrete or high-density blockwork.
Seal Internal Finishes Thoroughly Treat the internal surface of the smoke shaft as the primary air seal line. Finishes should be smooth and fully sealed at all joints and junctions, particularly where steelwork or other elements penetrate the shaft.
Seal All Service Penetrations Ensure all service, structural, and cable penetrations through the shaft envelope are carefully sealed using appropriate fire- and air-rated products.
Seal Door Openings Effectively All access doors within the smoke shaft should be fully sealed using robust, heavy-duty sealing systems to prevent air leakage.
Seal AOV Door Frames The perimeter of Automatic Opening Vent (AOV) door frames must be fully mastic sealed to maintain continuity of the air barrier.
Seal the Base and Head of the Shaft Pay close attention to the base and head of the shaft, ensuring both are fully sealed prior to testing.
Use Calibrated Testing Equipment Testing should be carried out using a UKAS-calibrated blower door fan, capable of pressurising the smoke shaft and accurately measuring air leakage.
Address Any Test Failures Promptly If the smoke shaft does not achieve the required performance, diagnostic methods such as smoke testing and thermal imaging should be used to locate leakage paths and guide targeted remedial works.
By following these steps, you can ensure your smoke shaft is properly prepared for air tightness testing, improving compliance with current building regulations and enhancing overall fire safety.
Why Choose APT for Smoke Shaft Air Tightness Testing?
APT has extensive experience supporting clients with smoke shaft testing across projects of all sizes. We also provide a dedicated diagnostic service for failed smoke shafts, using smoke testing and thermal imaging to accurately identify air leakage paths within the shaft envelope.
On many projects where smoke shafts initially failed, our engineers have rapidly located leakage points, enabling targeted remedial works and successful re-testing with minimal disruption.
Our UKAS-qualified and fully trained engineers are highly knowledgeable in current industry standards and testing methodologies. This expertise allows us to provide clear, actionable recommendations to improve the performance of your smoke shafts.
Air Pressure Testing is one of the few companies in the UK that is both UKAS-accredited and ATTMA Level 2 accredited for air tightness testing of buildings, smoke shafts, and floor plenums. This ensures all testing is carried out in line with regulatory requirements and recognised best practice, giving you complete confidence in the results.
Have you ever wondered how buildings are designed to be quiet and peaceful? The secret often lies in professional acoustic consultancy. This service plays a key role in making sure your construction or renovation project meets noise regulations. Understanding the importance of site surveys is the first step toward a compliant and comfortable building. By working with experts from the start, you can ensure successful project outcomes without the headache of noise-related problems down the line.
When undertaking a construction project, managing sound is more important than you might think. Acoustic consultancy helps you navigate the complex world of noise control, ensuring your building is comfortable and compliant.
Professionals in this field provide expert advice to make sure your project adheres to all necessary building codes and environmental regulations. Let’s explore what these consultants do and why their early involvement is so beneficial.
What Does an Acoustic Consultant Do?
So, what exactly is the job of an acoustic consultant? Their primary role is to assess, manage, and design for sound. This begins with a professional site survey to gather accurate site data. During these visits, they inspect the existing construction to identify any potential acoustic challenges, such as the use of lightweight blocks that don’t block sound well.
The consultant also checks that acoustic materials are being installed correctly by your team. This hands-on approach ensures that the design will perform as expected in the real world. For noise and vibration assessments, they use specialized equipment to measure sound levels, providing a clear picture of the current acoustic environment.
Ultimately, their work is about ensuring regulatory compliance and even improving energy efficiency through smart material choices. By analyzing the site and construction, they provide targeted recommendations that help your project meet all necessary standards, like Part E of the Building Regulations.
Benefits of Engaging Acoustic Consultancy Services Early
Bringing in an acoustic consultant at the beginning of your project offers significant advantages. Early engagement is key to identifying potential issues before they become expensive problems. A site survey visit before construction starts provides valuable insights into the property’s unique acoustic characteristics.
This proactive approach helps prevent costly delays that can arise from failed sound tests later on. By addressing challenges from the outset, you can ensure a smoother project execution and keep everything on schedule and within budget.
Engaging experts early leads to better results and greater customer satisfaction. Key benefits include:
Avoiding Costly Rework: Identifying and fixing acoustic problems during the design phase is much cheaper than correcting them after construction is complete.
Ensuring Compliance: Consultants help you meet all legal sound insulation requirements from day one.
Achieving Peace of Mind: Knowing that your project is on the right track acoustically lets you and your team feel confident about the final outcome.
Understanding Site Survey Visits in Acoustic Consultancy
The site survey process is a fundamental part of any successful acoustic consultancy service. It’s how experts gather the essential information needed to provide effective advice. Without accurate measurements and a firsthand look at the property, it’s impossible to create a targeted acoustic design.
A detailed site survey allows consultants to understand the specific challenges of your project. Depending on your needs, there are different types of surveys that can be performed, each providing unique data. Let’s look at what happens during these visits and who needs to be involved.
What Happens During a Site Survey Visit?
A site survey is a necessary and structured process designed for thorough data collection. When the survey team arrives, they will review the survey layout and assess the property’s current state. This visit is critical because a compliant design can still fail a sound test due to poor workmanship.
During the visit, the consultant performs a risk assessment to identify any elements that could compromise acoustic performance. They also observe environmental conditions that might affect noise levels. The main goal is to check the construction and installation of materials.
You can expect the survey to involve several key activities, including:
Checking the existing construction for acoustically weak materials.
Verifying that installation teams are following the manufacturer’s guidelines for acoustic products.
Measuring existing sound levels to establish a baseline for the acoustic design.
Who Attends a Site Survey Visit and What Should You Prepare?
Typically, the site survey team includes an experienced acoustic consultant. Their role is to lead the assessment, take measurements, and identify any issues. It’s also helpful for you, the client, or your project manager to be present to answer questions and provide access to all necessary areas.
Proper preparation is essential for effective project planning and ensures the team can collect accurate data. Before the visit, you can help the process run smoothly by having key information ready. This allows the surveyors to make the most of their time on-site and gather the best possible survey data.
To help the team, you should prepare the following:
Access: Ensure all relevant areas of the site are accessible.
Drawings: Provide architectural plans or drawings of the proposed development.
Project Details: Share information about the construction materials and methods you plan to use.
Acoustic Testing: from Sample Sound Testing to Noise Surveys
Acoustic consultancy involves various types of surveys, each designed for a specific purpose. The right type of survey for your project depends on your goals, the existing noise levels, and the requirements of local building codes. Some tests check the performance of walls and floors, while others assess noise from the surrounding environment.
From sample sound testing to comprehensive noise surveys for planning applications, each method provides critical information. Understanding these different tests will help you see how consultants develop a complete picture of your project’s acoustic needs.
Sample Sound Testing: When and Why Is It Used?
Sample sound testing is often used for renovation or conversion projects. It involves testing the existing walls and floors of a building to see how well they currently block sound. This provides accurate data that forms the basis for a targeted acoustic design, ensuring you only spend money on necessary improvements.
This type of testing is valuable because it gives a real-world overview of the building’s performance, accounting for any unique construction quirks or environmental factors. It helps identify potential challenges early on, such as a party wall that needs significant upgrades to meet Building Regulations Part E.
The survey data collected from sample sound testing helps consultants:
Establish the baseline sound insulation performance.
Create a cost-effective and targeted acoustic design.
Avoid over-engineering solutions, saving you time and money.
Overview of the BS4142 Plant Noise Survey Requirements
If your project includes new industrial or commercial equipment like air conditioners or extraction systems, you may need a BS4142 plant noise survey. This standard is used to assess the environmental impact of noise from industrial sources on nearby residential areas. It is one of the key types of site surveys for ensuring regulatory compliance.
Following the BS4142 method helps prevent complaints and potential legal issues with the local authority. The survey involves measuring the existing background noise and then predicting or measuring the noise from the new equipment. A typical survey can take 24 hours to capture noise variations throughout the day and night.
The assessment compares the new noise level to the existing background noise to determine the level of impact.
Assessment Step
Description
Measure Background Noise
The existing noise level (LA90) is measured at different times of day without the new source.
Determine Specific Noise
The noise level of the new plant or machinery is predicted or measured.
Calculate Impact
The difference between the new noise and the background noise indicates the likely impact on residents.
Acoustic Design Services for New Builds and Retrofits
Beyond testing, acoustic design services are essential for creating quiet, comfortable, and compliant buildings from the ground up. Whether you are working on a new build or retrofitting an old property, a professional acoustic design ensures that sound insulation is an integral part of the construction, not an afterthought. APT Sound Testing has years of experience providing these services for projects of all sizes.
This proactive approach supports sustainable practices by selecting the right materials for both acoustic performance and energy efficiency. For land development projects, a solid acoustic design is crucial for protecting future residents from external noise and ensuring the development is a desirable place to live.
How Acoustic Design Services Optimize Building Performance
Acoustic design services optimize building performance by integrating sound control into the earliest stages of project planning. During an architectural site survey or design review, consultants analyze your floor plans and construction proposals. They consider the unique characteristics of your building to recommend the most effective solutions.
This detailed review looks at the mass, isolation, and absorption elements of your proposed party walls and floors. By leveraging data from thousands of previous sound tests, consultants know what works and what doesn’t for different types of construction. This expertise helps prevent common mistakes and leads to better final results.
An optimized acoustic design directly contributes to customer satisfaction by ensuring:
The building meets or exceeds the requirements of Approved Document E.
Future residents enjoy a peaceful living environment.
The risk of a failed pre-completion sound test is significantly reduced.
Acoustic Consultancy & Construction
Acoustic consultancy testing is essential for ensuring that your construction or renovation project meets the necessary sound standards and provides a comfortable environment. By engaging acoustic consultants early in the process, you can identify potential issues and implement effective solutions that enhance both functionality and aesthetics.
Understanding the various types of acoustic testing available, from sample sound testing to comprehensive noise surveys, empowers you to make informed decisions for your project. Remember, a well-executed acoustic plan not only contributes to better building performance but also elevates the overall experience for occupants. If you’re ready to take the next step, reach out for a free consultation to discuss how our acoustic consultancy services can benefit your project!
Here at APT Sound Testing we can offer a detailed survey report and outline possible mitigation measures with noise mapping to show the ‘real life’ effectiveness of the measures. Such assessments can cover extraction systems, air conditioners, industrial plant, refrigeration units, and general use of industrial buildings.
If the local authority has requested you undertake a BS4142 Noise Assessment please call us now on 01525 303905 or email us at info@aptsoundtesting.co.uk
APT Sound Testing is a professional noise and acoustic consultancy firm operating in Greater London and the Home Counties. Our fully qualified and highly experienced consultants can provide expert advice and conduct survey analysis into all aspects of sound, such as investigating complaints into excessive noise and/or a BS 4142 London Noise Surveys.
We undertake London noise surveys on numerous potential housing and other noise-sensitive sites throughout the Capital and the UK. Our acoustic surveys cater for sites that may be exposed to noise from road, rail or air traffic and/or from industrial activity.
We undertake wide range of services from noise assessments through to noise mitigation proposals. Where it is proposed to install new plant or equipment, we undertake noise surveys to determine noise emission limits, in line with Local Authority requirements, and provide advice on mitigation.
As a local company we have an in depth knowledge on Greater London planning permissions and local legislation. Our noise consultants are expertly suited to carry out noise assessments, with a wealth of experience in assessing the sound impact of residential, industrial and commercial businesses in the community.
Noise Surveys for New Developments in London London noise surveys and report should be submitted during the pre-application process and discussions on planning applications. In many circumstances a planning condition will stipulate that a noise survey will need to be undertaken.
Noise surveys are normally carried out at the design stage of the project prior to the commencement of construction., this is to allow the acoustic design of the building to take into account the local noise levels, i.e. if the local noise levels are quite high then the acoustic design will ned to be more robust to mitigate any potential noise problems. Thereafter the local authority may also require post a BS 8182 London noise survey to prove that the noise standards have been achieved within the living rooms and bedrooms. The following information will usually need to be included within the noise survey report.
The reason and scope of the report.
Location plan of the proposed development and likely receptor points such as the nearest residential window/s.
The noise survey Methodology including the noise monitoring location, the equipment used and the weather conditions during the noise survey.
Reasons for deviations from standard methods.
Full table of results.
A comparison of survey results against the noise standards.
Recommendations for noise control measures – acoustic barriers etc.
Full calculations against noise reductions expected to support any suggested noise control measures.
The Different NEC Noise Exposure Categories (NECs) There are four Noise Exposure Categories based on the level of noise at the development. The NEC in which the site falls determines to what extent noise should be considered in the granting of planning permission. The NEC(s) are usually determined by monitoring noise levels. Potential mitigation options can then be assessed by calculation, and/or the use of noise modelling. Appropriate noise mitigation can then be incorporated into the development at the design stage.
Problems relating to noise during the planning stages can usually be avoided or resolved with a good, detailed and accurate acoustic assessment report and by accounting for robust mitigation measures where and when required.
APT Sound Testing can be consulted on all aspects of acoustic related issues. In addition to sound measurements we also provide invaluable advice on the soundproofing design of walls and floors to meet the standards of Part E of Building Regulations. As a true specialist, we can offer a complete solution. Here are a few of our services:
Acoustic Design Service to ensure you project complies with Building Regulations Part E.
Sample sound testing to check the acoustic performance of your existing construction to allow for targeted acoustic upgrades.
Visual site surveys to insure your subcontractors are constructing the acoustic details correctly
Pre-completion London Sound Testing in compliance with Building Regulations Part E.
Pre-Completion Sound Testing In London Pre-Completion Sound Testing is method of showing compliance with Approved Document Part E of the Building Regulations by testing the completed construction prior to handover. Sound Testing Services in the UK required for Pre-Completion Testing (PCT) with respect to Building Regulations Approved Document Part E is carried out when the construction of party walls and floors are complete.
Site Visits & Sample Sound Testing
APT Sound Testing offer Acoustic Site Survey visits to let us view the existing site construction. This allows us to check for potential problematic areas such as lightweight blocks haven’t been used in the existing construction. It also lets us check that the installation teams are installing the acoustic materials as per manufacturer’s guidelines, thus avoiding crucial onsite mistakes. We can also undertake sample sound testing of existing site construction; this offers an accurate overview of the acoustic performance of the existing partitions which enables us to offer a targeted acoustic design which correlates with the sound performance of the existing construction.
BS8233 Noise Surveys in London London noise assessments are often required at the planning stage of developments that may generate noise, and noise-sensitive developments which may be affected by noise. Some developments, such as mixed use, fall into both categories. Potentially noise generating developments often require a Noise Impact Assessment to be undertaken. This normally requires existing ambient noise levels to be established, typically by undertaking measurements, and the impact of noise from the development to be established. For large developments, it is often necessary to consider secondary effects, such as the impact of increased traffic on existing roads.
Internal noise levels within the proposed buildings can be calculated using our latest noise prediction software. For most buildings, the overall sound insulation performance of the building envelope will depend on the glazing system employed. It may be necessary to stipulate specific glazing and ventilation systems that must be employed to ensure that internal noise criteria are achieved.
If you are an individual or a business with sound problems, and would like to speak with one of our professional noise consultants, please speak to one of our advisors today. The noise assessment process isn’t intrusive, lengthy or costly. Normally we would leave a meter over a 24 hour period which would gather the necessary data automatically, taking into account other factors such as construction, setting and external variables. We could then provide a detailed report and advise how best to proceed.
Contact APT Sound Testing APT Sound Testing is one of the leading acoustic consultancy firms operating in the Greater London area. For London noise surveys, assessments, studies as well as our full range of London sound insulation testing, please contact our knowledgeable team of noise experts to provide professional and invaluable advice which could save you time and potential costs further down the line – call today on 01525 303905 or email info@aptsoundtesting.co.uk
Sound Testing Services on London Developments London is a huge city containing over 8 million people. In this crowded environment it is essential that noise transference between properties in kept to a minimum between new and existing buildings for the occupant’s wellbeing.
To help control noise issues APT Sound Testing undertakes UKAS accredited Part E sound throughout London and the South East. When there are problems with noise transference between dwellings, and the building’s design is called into question we can offer advice on how to upgrade the wall and/or wall partition.
We has extensive knowledge regarding the way different materials and construction methods can influence the results of a sound test, this helps to ensure to ensure your company achieves compliance with the Sound Testing for Part E of Building Regulations.
Sound Testing Services in London Pre completion sound testing in London has been a mandatory requirement since July 2003. All new build properties and conversions which were built after this date require 10% of each party wall/floor construction type to be tested. Sound insulation testing is to be carried out between pairs of rooms separated by party walls and/or floors. In is usual to test between living rooms and bedrooms, which are classed as the two main habitable rooms; however, other rooms can be used if this is not possible.
We are also experiencing a rise in the amount of sound testing that’s required to existing London buildings. We have carried out a large amount of sound tests in council/housing association blocks, where the residents are experiencing excess noise between the dividing wall and floor partitions. We also undertake sound testing to existing flats where the lease stipulates that wooden floors should not be used instead of carpets and as a result the noise levels have increased through the floors. In all these instances we can undertake sound testing to highlight the existing noise levels so acoustic upgrades – if required) can be targeted and implemented.
Our test procedure involves setting up a noise source in a room on one side of the party wall or floor and measuring the noise on both sides of the partition. Airborne sound testing may also be required between horizontally and vertically separated pairs of rooms.
The sound insulation testing is undertaken by using a sound source, amplifier and loudspeaker to generate a high noise level in one room (the source room). Noise measurements are then taken in both the source and receiver rooms using a prescribed number of source and microphone positions. The background levels in the receiver room are measured and the reverberation time in the receiver room is also measured. From the results, the airborne sound insulation (DnT,w + Ctr) is calculated and compared to the requirements of Approved Document E of Building Regulations.
For vertically separated rooms, Impact sound testing may also be required. This sound test is undertaken using a tapping machine which drops a series of weights onto the floor of the upper room. The noise level in the lower (receiver) room is measured for a prescribed number of source and microphone locations. The background levels in the receiver room are measured and the reverberation time in the receiver room is also measured. From the results, the impact sound insulation results (LnT,w) is calculated and compared to the requirements of Approved Document E of Building Regulations.
APT Sound Testing Services Our sound test engineers carry all the latest Norsonic equipment, which are class one rating and all of our sound insulation testing, is completed to a strict quality controlled standard. We provide full UKAS Accredited sound insulation testing and air testing.
If you would like advice on your acoustic design or sound testing in London, please contact APT Sound Testing now on 01525 303905 or visit our Acoustic & Sound Testing Services website.
Prior to the noise survey the acoustic consultant will need to know the noise parameters set by the local environmental protection team for the required noise impact assessment.
1st Step – Baseline situation
It will usually be necessary to have a full understanding of the existing noise levels in the vicinity of the receptor. This can be achieved by carrying out a planning noise survey of background or ambient noise levels over the period when the noise source will be operational.
The baseline noise levels will usually be determined by measuring the LA90 or the LAeq, however in practice both will usually be measured simultaneously.
The term ‘LA90’ is the ‘A’ weighted noise level exceeded for 90% of the measurement period. Typically this is called the background noise level if it relates to a period when the noise source is not operational.
The ‘A’ weighting is a correction applied within a sound level meter to adjust the response of the Class A noise meter to match the response of human hearing at different frequencies. This is used to exclude short-term noises, such as a vehicle passing from the measurement value, leaving only the underlying or background noise.
The terms ‘LAeq’ is as an average noise level over the measurement period, although it relates to the average noise energy. It is a popular and universally used measure which correlates well with human annoyance.
Step 2 – Noise sources and times of operation
A detailed knowledge of the noise source (or in the case of a proposed development, the likely noise source) is also essential. This is because noise levels are of less importance than the amount by which they exceed the baseline noise and the times or days of operation.
Step 3 – Manufacturer Data for Proposed Equipment
If the proposed development will create a source of noise, the noise consultant may need the manufacturer’s data for proposed equipment, times of operation and working practices.
Step 4 – Determining the impact
Noise impact is determined using a variety of methods, all of which will rely on comparing noise levels at a receptor against absolute noise level criteria or against existing baseline noise levels. Generally one of three approaches is used:
Where the proposal is for a development which will introduce an industrial type noise source, or where a receptor in a new development may be affected by this type of source, it is usual to assess impact by comparing the noise level, after making corrections for certain attributes of the noise, against background noise levels at the receptor (existing or proposed). The council expects that, at the receptor, noise from the source is a certain amount below existing background levels. Typical cases include new equipment in a business, an air conditioning unit or an extract and fan serving a restaurant. This is known as the BS4142 methodology.
In some cases the impact does not depend on a comparison between source levels and baseline levels. For example, a proposed housing development is close to an existing road, where generally the impact is determined by establishing whether the absolute levels due to the source are acceptable.
Applications for certain developments may require a more specialist approach. For example, the method for assessing a new nightclub combines both elements. Existing levels of noise in low frequency bands are measured and compared against levels in those same frequencies with music playing. The council may then require that the music does not cause any increase above existing levels.
Step 5 – Noise mitigation measures
Development proposals which are inherently noisy may include mitigation measures in the original scheme. However, the need for further mitigation may be necessary when the impact assessment indicates that the acceptability criteria are exceeded. Either way noise mitigation, or reduction measures, should be considered in the assessment in demonstrating how the acceptability criteria will be achieved.
The most effective measures will be those which reduce levels at source, rather than in transmission or at the receptor. However, in situations such as where the proposal is for new housing near existing sources of noise, it will not be possible to reduce source noise levels. Where the proposal will introduce a new noise source it is good practice to reduce levels at source as far as possible, before considering other mitigation measures, some of these may be:
Reduction of noise at source – Using equipment or systems with lower sound power levels is highly effective and can avoid the need for other more costly and intrusive mitigation options. Noise impact can be lessened by reducing total running times or by shifting operations to less sensitive times of the day. The use of acoustic silencers and enclosures around the source may also be effective at reducing the need for other mitigation methods.
Reduction of noise in transmission – The simplest way to reduce noise once emitted is by increasing the distance to receptors. For example, siting of plant and equipment within an industrial site as far away from sensitive receptors as possible and/or the new housing development may be designed so that properties are set back from a noise source. In many cases, a properly calculated buffer zone between source and receptor will represent the most cost effective solution.
Reduction of noise at a receptor – if the development is located in a busy urban area, this may be the only option to reduce the noise impact, also where the applicant has no access to land for the construction of a barrier. The way a development is designed can be an effective mitigation tool if the building faces away from the main noise source. Also, if noise sensitive rooms are located on the sheltered side of the building, the impact will be reduced at the most sensitive areas.
Acoustic Improvements to the building façade – Where no other options are available, improving the sound insulation of a building facade can be effective in reducing internal noise levels. However, often it will be necessary to provide acoustic treated mechanical ventilation to avoid the need to open windows in warm or humid weather, this is often the solution next to busy elevated railway lines.
Here at APT Sound Testing, we can offer a detailed survey report and outline possible mitigation measures with noise mapping to show the ‘real life’ effectiveness of the measures. Such assessments can cover extraction systems, air conditioners, industrial plant, refrigeration units, and general use of industrial buildings.
If you would like more information in regards to our planning noise surveys for planning and acoustic design for your development, please visit the APT Sound Testing website or call us today on 01525 303905.
Thermal imaging (thermographic) surveys are one of the most effective diagnostic tools for identifying heat loss in commercial buildings across London and the South East. Using advanced infrared technology, these surveys clearly highlight where energy is escaping, often revealing issues that building owners are completely unaware of.
Many of our clients are genuinely surprised by the number and scale of heat loss sources uncovered during a thermal imaging survey. Common problems include cold draughts caused by air leakage through cracks in the building envelope, as well as missing or poorly installed insulation within walls, floors, or roof spaces, sometimes entire sections are found to have been overlooked during installation.
How Do We Carry Out a Thermal Imaging Survey?
We aim to arrange a site visit at a time that is convenient for you. Thermal imaging surveys are typically carried out between November and April, as suitable weather conditions are essential for accurate results. In some cases, surveys may need to be rescheduled if conditions are unsuitable, such as during heavy rainfall or periods of high daytime and nighttime temperatures.
On arrival, our thermal engineer will discuss any known heat loss issues, draughts, or comfort concerns you have, as well as your objectives for the survey. Unlike many competitors, we always conduct both internal and external thermal surveys as standard, ensuring a comprehensive assessment of your building’s performance.
How Long Does a Thermal Imaging Survey Take?
The duration of a survey depends on the size of the building and how involved you wish to be. We strongly encourage building owners or site representatives to accompany our engineer during the inspection. This collaborative approach allows us to explain findings in real time and ensures you gain a clearer understanding of the issues identified.
Small to medium buildings: 1–2 hours
Large commercial buildings: 3–4 hours
Allow additional time if you have specific questions or multiple areas of concern.
When Will You Receive the Thermal Imaging Report?
Your comprehensive thermal imaging report is typically delivered within 1–2 working days in PDF format. The report includes:
Thermal and visual images
Clear interpretation of findings
Identification of defects and potential causes
Many other providers take 1–2 weeks to deliver reports, so our fast turnaround ensures you can act quickly.
Why Choose Us for Your Thermal Imaging Survey?
Our engineers are trained to Level 3 thermographic certification, the highest level achievable in the industry. Combined with our use of large-format FLIR thermal imaging cameras, this ensures the highest possible accuracy and clarity when identifying defects.
Our Specification Includes:
Level 3 thermographic certification
Level 3 qualified thermographers
Large-format FLIR cameras with 45-degree lenses
This combination gives you the best possible chance of accurately diagnosing and resolving thermal performance issues.
What Types of Buildings Benefit from Thermal Imaging Surveys?
Improving Sound Insulation on London Property Developments Many of the dwellings in London consist of flats converted from large Victorian houses.. Unfortunately at the time of the building conversion, designing for sound insulation was not a high priority and so many of the dwellings suffer from adverse noise transference between the floor and wall partitions. This can be extremely stressful to the occupant’s well being is a major cause for concern.
There are ways to improve the airborne and impact performance by improving the wall/floor partitions ability to reduce the amount of sound transmission from one side of a construction element to the other. By isolating the different materials may not be enough its own and you may need to improve the mass of the partition as well.
Improving Existing Floor Partitions In our experience of undertaking hundreds of sound insulation tests in London, refurbishment projects usually achieve 30-35dB for airborne sound and 70dB for Impact Sound, if the existing construction has not been acoustically upgraded. These figures do not meet the required 43dB & 64dB as stipulated in Part E of Building Regulations. As sound double every 10dB this is a massive failure and acoustic improvements must be made. Many existing construction consist of a similar construction as shown in as detail 1 below.
Acoustic Improvements to Existing Floor Partitions To reduce airborne and impact sound transmission this usually means adding density and isolation to the floor construction. This can be as simple as adding a drop ceiling consisting of 125mm timber frame. The top of the frame must be a minimum of 25mm below the existing ceiling finish – such as lathe and plaster. Then, to the inside of the timber frame add 100mm of Acoustic Wool and two layers of sound-board tacked to the bottom of the timber frame – all boards to be lapped.
This should improve your sound test results by approx. 10-15dB depending on the existing site conditions and quality of the installation. Detail 2 shows this in more detail.
Improving Existing Wall Partitions The standard onsite construction for existing internal walls may be a mixture of 100mm masonry with render applied to either side; or, 100mm timber partition with lathe and plaster to either side. Unfortunately neither of these existing wall constructions will have the acoustic properties to pass Part E in their existing state due to lack of mass and poor isolation values.
Improving Wall Partitions One way to quick and simple way improve the acoustic performance of a the dividing wall partition, is to install a 70mm metsec partition in front of the existing wall – its usually best to install this in the largest room. Leave approx. 25mm gap between the back of the metsec and the wall. Then install 50mm acoustic wool to the inside of the metsec and add two layers of soundboard to the outside of the metsec frame, ensuring all boards are properly lapped and the perimeter joints are filled with acoustic mastic.
Taking the above into account is it essential that the acoustic design is addressed right from the start of the refurbishment project, so it prevents delays in handover, i.e. to prevent the dwelling failing the sound testing at building control signoff stage.– a common problem.
We can also offer acoustic design advice and UKAS sound testing on existing flats to ensure that the building handover is not delayed due to noncompliance with Part E. We can also undertake sample sound testing on projects where clients are worried about existing ‘hybrid’ construction/s to help highlight the existing noise levels so acoustic upgrades – if required) can be quickly targeted and implemented.
At APT Sound Testing, we carry out professional sound testing on all types of residential and commercial buildings across London and throughout the UK. Our services also cover schools and buildings that include rooms for residential use. As a UKAS-accredited provider, all of our testing meets the requirements of Approved Document E of the Building Regulations.
A Friendly, Proactive Approach to Acoustic Compliance
We pride ourselves on offering a friendly, forward-thinking service that covers everything from acoustic design and consultancy to full pre-completion testing and certification. With many years of experience supporting clients in both the public and private sectors, we work with everyone—from self-builders and small developers to major national house builders. We also support specialist sectors, including healthcare and banking, particularly for cleanroom testing.
Our clients value not only our deep technical knowledge but also our approachable, proactive way of working. This commitment to service is one of the reasons we enjoy one of the highest return-client rates of any pre-completion testing consultancy in the UK.
Local Expertise with National Reach
Unlike many providers, we never subcontract our work. All testing is completed by our in-house engineers, ensuring consistency, quality, and reliability across every project.
With an office located in central London, we’re ideally positioned to respond quickly to urgent survey and testing requirements. We also have the capacity to carry out last-minute appointments and weekend testing, a service used frequently by clients in fast-paced sectors such as banking.
Qualified Engineers, UKAS Accreditation, and Modern Equipment
Our highly trained engineers deliver an efficient, customer-focused service from the initial design phase through to project completion. Thanks to decades of accumulated acoustic design experience, we understand the unique needs of each project and can tailor our advice accordingly.
As a multi-UKAS accredited laboratory operating to strict ISO standards, we guarantee a high level of quality and professionalism. We invest heavily in state-of-the-art acoustic testing and survey equipment, all calibrated to UKAS standards, enabling us to deliver accurate and dependable results.
Integrated Acoustic and Air Tightness Services
To make compliance as smooth as possible, we also offer in-house UKAS-accredited air tightness testing, allowing clients to combine both services in a single, seamless package—reducing costs and avoiding coordination headaches.
Get in Touch
If you need advice or want to book a sound test, we’re here to help. Contact us through our online form or call 01525 303905 to discuss your project with one of our friendly and knowledgeable acoustic or air-tightness consultants.
This guide is designed specifically for leaseholders who are upgrading their floor finishes from carpet to wood. It explains why sound testing is required, what the tests measure, and how to ensure compliance with lease conditions and Building Regulations.
🔎 Why Leaseholders Require Sound Testing to Floors
Many residential leases include covenants that:
Require carpets to remain in place, or
Demand proof that any new hard floor finish (such as wood or laminate) achieves equivalent sound insulation performance to the original construction.
Replacing carpet with wood often increases both impact and perceived noise in the flat below unless acoustic upgrades are installed.
Freeholders and management companies typically request acoustic evidence to prevent disputes and ensure compliance with lease terms or Building Regulations Part E.
📊 Pre‑Works and Post‑Works Sound Testing
Pre‑works sound testing: Baseline measurements are taken with the existing carpet finish to record current airborne and impact insulation performance. These results set the target values for the new floor system.
Acoustic upgrades: Specialist acoustic companies can recommend tailored upgrades (e.g., underlays, insulation, resilient ceiling systems) to maximise the chance of passing post‑works testing.
Post‑works sound testing: Conducted after installation and upgrades, using the same methods to provide a direct comparison with baseline results.
Test standards and measurements: Reports follow recognised methods for airborne and impact sound reduction. Results are compared against lease requirements, Building Regulations Part E, or the pre‑works baseline.
👉 Tip: Always confirm test protocol, locations, and pass criteria with your management company before starting work. This ensures results are accepted without dispute.
📐 How to Compare and Complete Sound Test Results
Match test conditions: Post‑works sound tests must replicate pre‑works setup (same receiver positions, furniture state, doors/windows closed).
Compare metrics:
Airborne noise: Higher sound reduction (dB) = better. Post‑works values should equal or exceed baseline.
Impact noise: Lower sound pressure level (Lp) = better. Post‑works values should be equal to or lower than baseline.
Produce a compliance report: Include:
Accredited test certificates
A clear table comparing pre‑ and post‑works values
Photographic evidence of acoustic measures
A signed statement confirming the tested configuration represents the finished floor system
If results fail: Document remedial measures and re‑test. Common fixes include adding or improving acoustic layers above/below joists.
Accurate records and clear reporting help secure freeholder sign‑off or a formal Licence to Alter.
✅ Summary
Converting from carpet to wood in a leasehold flat almost always requires both pre‑works and post‑works sound testing. The best chance of compliance comes from:
This combined approach ensures no loss of acoustic performance compared with the original carpet finish.
📞 Contact Us Today
Our expertise, comprehensive services, and commitment to quality make us the trusted choice for sound insulation testing. We use the latest UKAS calibrated sound test equipment so you can be sure you are in safe hands.
📧 Email: info@aptsoundtesting.co.uk
📱 Call Darren direct: 07775 623464
Contact us today to schedule a sound test or learn more about our acoustic design services.
