BS4142 noise surveys are conducted to assess the likely impact of industrial and commercial noise sources at noise sensitive premises. So, if you are installing external plant equipment, including air conditioning units, extractions systems or generators at your commercial premises, the Local Authority will request a BS4142 noise assessment to be undertaken to ensure the noise impact at the nearest residence is kept to a minimum. BS4142 will also apply if you are developing new sensitive premises, including residential houses or flats, schools, healthcare or hotels, in close proximity to existing industrial or commercial noise sources.
A BS4142 noise report can be requested at the pre-application stage of planning permission, if the Local Authority considers noise to be a high enough risk to affect the likelihood of the planning application being accepted. Or it may be conditioned under the planning permission approval. The information submitted within a noise survey report allows the Planning and Environmental Health Departments to assess the level of noise impact expected from the development and ensure appropriate noise control measures are put in to place.
Ultimately, the purpose of the BS4142 noise survey is to ensure that the development is compliant with the National Planning and Policy Framework and Noise Policy Statement for England.