What levels do I need to achieve to pass my BS8233 Noise Assessment?

To pass a noise assessment BS 8233:2014 Sound Insulation and Noise Reduction for Buildings, the Code of Practice suggests that the following internal noise levels are achieved on all new residential developments:

Activity
Location
07:00 to 23:00
23:00 to 07:00
Resting
Living Room
35 dB LAeq, 16 hour

Dining
Dining room/area
40 dB LAeq, 16 hour

Sleeping (daytime resting)
Bedroom
35 dB LAeq, 16 hour
30 dB LAeq, 8 hour

Regular individual noise events such as passing trains or aircraft 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.

The corresponding 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.