ENVIRONMENTAL NOISE (BS 7445)


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.

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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.

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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 enquiries@soundplanning.co.uk.