BS 4142 Noise Assessment & Survey — Practical Guidance to BS 4142
What Is a BS 4142 Noise Assessment?
A BS 4142 noise assessment evaluates industrial or commercial sound to determine its impact on nearby receptors. The BS 4142:2014+A1:2019 standard is used by local authorities to assess the likelihood of adverse impact from mechanical plant, processes, and site activities.
We measure, analyse and classify sound using rating levels (LAr minus LAbg) and apply character corrections for tonality, impulsivity and intermittency.
How We Help
Our engineers conduct full BS 4142 surveys with Class-1 instrumentation and provide reports accepted by local planning authorities. We identify exceedances, propose mitigation and liaise directly with officers when required.
Over 150 Successful BS 4142 Assessments For:
Our Approach
Accurate Baseline Measurement — establish representative background and rating levels.
Character Corrections — assess tonality, impulsivity and intermittency objectively.
Impact Classification — interpret differences and context to define likely significance.
Mitigation Design — practical source control, barriers, or layout changes to achieve compliance.
When BS 4142 Applies
Industrial or manufacturing operations
Fixed plant such as HVAC, compressors, pumps and fans
Loading, unloading and yard activities
Mobile plant operating within a site boundary
What the Report Includes
Engineer qualifications and method statement
Source description and operating data
Noise survey data, meteorology and analysis
Rating level calculation and impact judgement
Mitigation recommendations and residual levels
Typical Costs
Assessments generally start from £700 + VAT, depending on site complexity and monitoring duration. Call 01908 643 433 for a tailored quote.
Noise Mitigation Measures
Acoustic barriers and screening
Vibration isolation and plant mounting
Low-noise equipment selection
Enclosures and acoustic lagging
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