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Posted: 14th April 2021

How to comply with a BS 8233 noise assessment for planning applications

A noise assessment is a key element for developers of residential projects such as houses, rental apartments, and hotels.  BS 8233 provides key criteria which must be considered if planning consent is to be awarded by the local authority.

BS 8233:2014 Guidance on sound insulation and noise reduction for buildings outlines acceptable internal and external noise levels.  Internal criteria are provided for bedrooms, living rooms, dining rooms.  Levels are specified during the daytime (between 0700 and 2300) and night-time (between 2300 and 0700).  Guidance sound levels are also provided for external amenity spaces (e.g. gardens and balconies) during the daytime.

The standard also offers guidance on how sound insulation or noise reduction strategies may be used to reduce the impact of noise in new properties.


Why is a BS 8233 noise survey required?

If a planned residential development, school, or hospital is to be sited close to a transport noise source, the Local Authority will request that a noise survey report is submitted with the planning application.  This is to assess the likely impact of noise on residents or occupants of the new buildings.

The noise impact assessment report will use appropriate Standards and guidance documents to ensure the development complies with the National Planning Policy Framework (NPPF) and Noise Policy Statement for England (NPSE).  BS 8233 is commonly accepted as providing acceptable guidance criteria for this assessment.  Appropriate mitigating measures can be put in place if sound levels will exceed the BS 8233 criteria.

At sites where noise is likely to be a factor in determining whether planning consent will be granted, the Local Authority may request the survey at the pre-application stage of the process.  Alternatively, planning consent permission may be granted with a condition requiring the report to be submitted at a later stage.


How is a noise survey conducted?

A BS 8233 survey establishes a baseline measurement of the noise in the local environment from key points on the site.  This allows a prediction of the future impact of noise to be gauged, with reference to BS 8233:2014.

  • The baseline noise level is measured typically over a 24-hour period.
  • Acoustic calculations are carried out to establish the level of noise across the development.  If necessary this can include noise mapping the proposed new buildings.
  • Suitable mitigation measures may be recommended to reduce the impact of noise on external areas.
  • Internal noise levels are calculated and the acoustic performance specified for double glazing and ventilation schemes.
  • A BS 8233 report will be produced which can be supplied to the Local Authority to support your planning application.


Contact ACA Acoustics for your BS 8233 survey and report

At ACA Acoustics, we are specialists in providing noise impact assessments for developers who are applying for planning consent for new residential properties and educational or healthcare facilities.  To find out more about our services and ensure that you meet your Local Authority’s requirements and deadlines for submitting a BS 8233 report, get in touch today.

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Posted By:ACA Acoustics

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