BS4142 Noise Impact Assessments

BS4142 Noise Impact Assessments for Planning Applications

If your planning condition requires a noise survey in accordance with BS4142, APT Sound Testing can help.

At APT Sound Testing, we understand that industrial and commercial noise is playing an increasingly important role in the planning process. With the government encouraging redevelopment of brownfield sites, industrial and residential areas are being built closer together — often raising concerns about how noise emissions may affect local communities and living standards.

Why a BS4142 Noise Assessment Matters

Local authorities use BS4142 assessments to control noise levels from industrial or commercial sources. These surveys help determine whether noise from new or existing sites — such as factories, plants, or mechanical equipment — could cause adverse effects for nearby residents. They are often essential for achieving planning approval and ensuring compliance with local noise regulations.

A BS4142 noise survey works by comparing the “rating level” of the noise source with the background sound level. The greater the difference between these two, the higher the likelihood of noise disturbance. Our specialist consultants can identify potential impacts and recommend practical mitigation measures to reduce nuisance and achieve compliance.

What We Assess

We assess all types of industrial and commercial noise sources, including:

• Mechanical and electrical systems such as air conditioning and extraction equipment
• Manufacturing processes and fixed plant machinery
• Loading and unloading operations
• Site vehicle movements, such as forklifts, lorries, or other operational traffic

Our BS4142 Survey Process

1. Background Survey – Measure existing environmental sound levels when the proposed noise source is not operating.
2. Noise Source Measurement – Record sound from the plant, machinery, or process under assessment.
3. Analysis & Character Correction – Apply BS4142 penalties for tonal, impulsive, or intermittent characteristics.
4. Impact Assessment – Compare the “rating level” with background sound (LA90) to determine potential impact.
5. Mitigation & Reporting – Provide a detailed report with recommendations, noise mapping, and practical solutions.

Equipment and Expertise

We use state-of-the-art Norsonic acoustic equipment to ensure precise, compliant results. Our consultants have extensive experience conducting BS4142 surveys across a range of industrial sites and can also model predicted noise impacts for proposed developments.

Whether you are introducing new equipment or addressing an existing noise complaint, our full BS4142-compliant surveys will help you demonstrate compliance and protect amenity values.

Get in Touch

If your local authority has requested a BS4142 Noise Assessment, contact APT Sound Testing today.
Call 01525 303905 or email info@aptsoundtesting.co.uk to discuss your project with one of our acoustic consultants.