Air source heat pumps (ASHPs) are an increasingly popular way to heat homes, offering a low-carbon alternative to gas. Many can be installed under permitted development rights, provided they meet the noise requirements of the MCS 020(a) assessment.
If that assessment shows the unit is too loud, or if the property doesn’t have permitted development rights (for example, it’s listed or in a conservation area), you’ll need a full planning application with a noise impact assessment. The same is true if you are looking at installing air conditioning.
MCS 020(a) assessments
This is a desktop calculation of the predicted noise level 1m from the most affected habitable neighbouring window, compared against a fixed limit of 37 dB(A). It’s quick and inexpensive, and often all that’s needed.
Full noise impact assessments
- We carry out a noise survey at the proposed location, typically over around 48 hours, to establish the existing background noise level.
- Using the manufacturer’s noise data, we predict noise levels 1m from the most affected habitable neighbouring windows, with corrections for the character of the noise where the Local Authority requires them.
- Where needed, we recommend mitigation, such as relocating the unit, screening or selecting a quieter model.
- Our findings are summarised in a technical report suitable for submission with the planning application.
We work with homeowners, installers and housing providers.
