Guide · Buying
Do you need planning permission for a heat pump?
Usually not — but the exceptions catch a lot of households out.
Most domestic air source heat pumps in England are permitted development, so no planning application is needed, provided the unit meets siting and noise conditions including compliance with MCS 020 for sound at the nearest neighbouring habitable room. Planning permission is normally required for listed buildings, and rules differ in Scotland, Wales and Northern Ireland.
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When permitted development applies
- The unit is used solely for heating the property.
- It meets the noise assessment requirement at the nearest neighbouring habitable room.
- It is sited away from a boundary where local conditions require a setback.
- It is not installed on a wall or roof facing a highway in a conservation area.
When you do need permission
- Listed buildings — listed building consent is also required.
- Flats and maisonettes in some authorities, where permitted development rights are narrower.
- Properties where permitted development rights have been removed by an Article 4 direction.
- Installations that cannot meet the noise condition at the proposed position.
Noise, in practice
The assessment considers the unit’s sound power, distance, and reflective surfaces. Moving the unit a metre, adding an acoustic barrier or choosing a quieter model usually resolves a marginal assessment. Your MCS installer completes this calculation as part of the design.
Frequently asked questions
- Do I need planning permission for an air source heat pump?
- Usually not in England — most installs are permitted development if siting and noise conditions are met.
- What about conservation areas?
- Permitted development is restricted on walls or roofs fronting a highway, so position matters. Check with the local planning authority.
- Are the rules the same in Scotland and Wales?
- The principle is similar but the detail differs, including boundary distances and thresholds. Confirm with your local authority.
- MCS Certified — Installer certification scheme required for grant eligibility.
- Energy Saving Trust — Heat pump efficiency, running cost and SCOP benchmarks (UK).
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