The 1991 British Standard (BS) 7445 specifies the descriptions and measurements of environmental noise.

This standard serves as a guideline for the necessary procedures and methodologies to be followed by a qualified acoustic engineer. Through BS 7445, acoustic engineers are able to perform a more accurate and traceable assessment.

Performed by experienced acoustic engineers, Sound Planning provides assessments for environmental noise.


BS 7445-1:2003 – Guide to quantities and procedures

This describes the methods and procedures that are practiced when measuring noise – it focuses on the noise of a community, individuals or both.

Results are shown corresponding to the constant A-weighted sound pressure levels. In accordance with BS EN 61672:2003 sound level meters should be a minimum Class 1 or Class 2 and should be adjusted according to the orders of the manufacturer; field calibration should be observed at least before and after each measurement.

BS 7445 also provides advice on selecting the appropriate parameters when recording different types of noise.

Outdoor measurements will also involve the following procedures:

  • The measurement should be attained more than 3.5m from a reflective structure (if possible)
  • The ideal measurement height ranges between 1.2m and 1.5m
  • The assessment time & date should be carefully selected to evaluate ambient and background noise conditions during appropriate meteorological conditions

Sound Planning Equipment

Sound Level Meters

  • UKAS Calibrated
  • Field Calibrated (each assessment)
  • Type 1
  • One Third Octave Band Capability
  • Noise & Vibration Channels
  • Impulsive/Tonal Functionality to incorporate the requirements of BS 4142: 2014
  • 7 Day Battery Life

For acoustic consultancy and services regarding environmental noise, please contact us on 01252 711972 or email us at

This website uses cookies. If you agree to our Privacy & Cookies Policy, please click here