Acoustic Consultant conductiong a BS8233 noise assessment

What to know about a Noise Assessment for planning: BS 8233:2014

During the planning process for new residential properties, it is common to have a planning condition from the Local Planning Authority, to ensure the internal noise levels meet the requirements of BS8233:2014, meaning you will require a noise assessment.

The external noise environment in the proximity of the proposed development is impacted on heavily by noise sources such as road traffic, rail traffic, industrial and commercial.

It is key to measure these external noises, to enable building façade specifications with specific reference to glazing and ventilation, to be created to ensure the internal noise level targets are achieved.

What a Noise Assessment Involves

An Environmental Noise Impact Assessment will normally involve a number of microphone positions externally, for measurement over a representative time period. A report will then be provided detailing the process of the survey, measurement data taken and recommendations moving forward to achieve the requirements of BS8233:2014.

The latest edition of BS8233 came into effect on 28 February 2014 and superseded the 1999 Edition.

Recommended Internal Noise Levels

BS 8233:2014 Sound Insulation and Noise Reduction for Buildings – Code of Practice suggests the following internal noise levels:

ActivityLocation07:00 to 23:0023:00 to 07:00
RestingLiving Room35 dB LAeq, 16 hour
DiningDining room/area40 dB LAeq, 16 hour
Sleeping (daytime resting)Bedroom35 dB LAeq, 16 hour30 dB LAeq, 8 hour

Regular individual noise events (for example, scheduled aircraft or passing trains) can cause sleep disturbance. A guideline may be set in terms of SEL or LAFmax depending on the character and number of events per night. Sporadic noise events could require separate values.

Acoustic Definitions include:

  • LAeq an A-weighted time averaged noise level
  • LAeq, 16hour the LAeq over a 16hour daytime period typically, 07:00 – 23:00
  • LAeq, 8hour the LAeq over an 8hour night time period typically, 23:00 – 07:00
  • LAFmax the maximum A-weighted sound pressure level occurring within a specified time period

To find out more about building regulations and noise, you can see the government website here or give us a call with any questions.

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