Noise impact and sound installation assessment

Last Updated: 21 February 2023

Used to determine whether the development will have a significant impact on existing noise levels or whether, when all appropriate forms of mitigation have been considered, the existing noise environment will adversely affect the proposed development.

When required

A noise impact and sound insulation assessment should accompany applications for:

  • proposed developments that have the potential to generate noise, for example: Industrial units, installation of external air conditioning units, workshops, day nurseries, nightclubs, places of worship, public houses, restaurants/takeaways, schools/colleges or outdoor sports facilities
  • proposed developments located next to an existing noise source, for example, next to an industrial site, a busy road, or railway line

Contents of noise and sound installation impact assessment

A noise impact and sound insulation assessment should include the following information:

  • existing background noise levels measured over a 24 hour period (including the cumulative noise levels of all existing units) to show representative background noise
  • proposed noise levels (including the cumulative noise levels of all proposed units)
  • any proposed measures to reduce noise from the proposed development
  • the system manufacturer’s specification of any proposed equipment to be installed, altered or replaced
  • details of the method used to compile the report and examples of the calculations and assumptions made

The noise impact and sound installation assessment must be carried out by suitably qualified professionals with relevant experience and expertise in the recognised methodologies.


Policy DM7 South Lakeland Local Plan Development Management Policies.