Heat Pump Planning Permission: What You Need to Know
Most heat pump installations in England do not need planning permission. Air source heat pumps are permitted development if they meet conditions on noise, size, and location. Listed buildings are the main exception: they always need listed building consent. Conservation areas have restrictions on visibility from the road. This guide covers every rule, what to do for listed buildings, the noise condition, and how your MCS installer handles the planning side.
Permitted development conditions
In England, you can install an air source heat pump without planning permission if all of the following conditions are met.
| Condition | Requirement |
|---|---|
| Noise | Must not exceed 42 dB(A) at 1 metre from nearest neighbour's habitable room window |
| Unit size | Outdoor unit volume must not exceed 0.6 cubic metres (most residential units comply) |
| Number of units | Only 1 air source heat pump per property under permitted development |
| Location (general) | Must be at least 1 metre from the property boundary |
| Location (conservation area) | Must not be on a wall or structure fronting a highway, and must not be visible from a highway |
| Listed buildings | Permitted development does NOT apply. Listed building consent required |
| Removal | Must be removed when no longer needed for heating |
Source: The Town and Country Planning (General Permitted Development) (England) Order 2015, Part 14, Class G.
Ground source heat pumps are also permitted development in England. The conditions are simpler: the installation must be on land within the property boundary and must not be in a scheduled monument area. No noise condition applies because the ground source unit is indoors.
Your installer handles this
A competent MCS installer will assess all permitted development conditions as part of your quote. They calculate the noise level at the boundary, check for conservation area or listed building status, and advise on the best placement. If planning permission is needed, they can advise on the application process.
The 42 dB noise condition
This is the condition that causes most concern. The heat pump must not produce more than 42 dB(A) when measured 1 metre from the nearest neighbouring property's habitable room window. Habitable rooms include bedrooms, living rooms, and dining rooms but not bathrooms, hallways, or garages.
Most modern air source heat pumps produce 42 to 50 dB at 1 metre from the unit itself. Sound drops by approximately 6 dB each time you double the distance. So a unit producing 48 dB at 1 metre will be at roughly 42 dB at 2 metres from the unit, and 36 dB at 4 metres.
For a detached house with the unit placed 5 metres from the nearest neighbour's window, almost any modern heat pump will comply. For semi-detached houses and terraces with the unit 2 to 3 metres from the boundary, careful model selection and placement are needed. Read our heat pump noise guide for detailed noise levels and reduction techniques.
If your installation cannot meet the 42 dB condition under permitted development, you can apply for full planning permission. The noise assessment will be part of the application, and the planning authority may approve it with conditions (such as operating hours or acoustic screening).
Listed buildings
Listed buildings (Grade I, II*, and II in England) are excluded from permitted development for heat pumps. You need listed building consent for any external alteration, including mounting or placing an air source heat pump unit externally, any external pipework or ductwork, drilling through external walls for refrigerant pipes, and changes to the interior that affect the building's character.
How to apply: Submit a listed building consent application to your local planning authority. Include details of the proposed heat pump location, unit dimensions, noise data, and photographs showing the visual impact. Your MCS installer should be able to provide the technical details.
Timeline: Allow 8 to 12 weeks for a decision. Complex cases or buildings of particular significance may take longer. Conservation officers may request modifications to reduce visual impact, such as relocating the unit to a less visible position or using screening.
Tips for approval: Place the unit in the rear garden or behind an outbuilding rather than on a principal elevation. Use a low-profile unit in a neutral colour. Offer to install acoustic and visual screening. Provide evidence that the installation is reversible (can be removed without damaging the building). Your installer's experience with similar listed properties is valuable here. See recommended anti-vibration pads for noise reduction that may help with planning concerns.
Do not install without consent on a listed building
Installing a heat pump on a listed building without listed building consent is a criminal offence. The local authority can require you to remove the unit and restore the building, at your expense. Always get consent first, even if it delays the project.
Conservation areas
Properties in conservation areas can install heat pumps under permitted development, but with an additional restriction: the outdoor unit must not be installed on a wall or roof slope fronting a highway, or on a building or structure within the grounds that fronts a highway and is visible from the highway.
In practice, this means placing the unit in a rear or side garden, behind a wall or fence, or in any position not visible from the street. Most conservation area installations are straightforward once the unit is positioned correctly.
If your property is both listed and in a conservation area, the listed building rules take precedence and you need listed building consent regardless of the unit's visibility.
Flats and shared properties
Flats have additional considerations. The outdoor unit typically needs to be placed on a balcony, in a communal garden, or on an external wall. You will need the freeholder's or management company's permission before installing. Some leases prohibit external alterations without consent.
In communal areas, you may also need to satisfy other residents and the managing agent that the noise and visual impact are acceptable. This is not a planning issue but a leasehold issue. Read our guide to heat pumps in flats for the full picture (coming soon).
Scotland, Wales, and Northern Ireland
Scotland: Permitted development rules for heat pumps are similar to England. The noise limit is 42 dB at 1 metre from a neighbour's window. Size limits and location rules differ slightly. Check the Scottish Government planning guidance.
Wales: Updated permitted development rules were introduced in 2024, broadly aligning with England. The noise and size conditions are similar. Check with your local planning authority for the most current rules.
Northern Ireland: Permitted development rights for heat pumps exist but are more restrictive. Check with your local council planning office.
What your installer should do
A good MCS installer will check your property's planning status (listed, conservation area, Article 4 directions) before quoting. They will calculate the noise level at the boundary and neighbour's window using the manufacturer's sound data and the distance from the proposed location. They will recommend placement that meets all conditions. If planning permission or listed building consent is needed, they will advise you on the process and provide the technical documentation needed for the application.
If your installer does not mention planning at all, ask specifically. Use the MCS directory to find certified installers. Get at least three quotes. Read our BUS grant guide for the application process once planning is sorted.
Use our heat pump calculator to estimate costs for your property while you work through the planning requirements.
Frequently asked questions
Do I need planning permission for a heat pump?
Usually no. Permitted development covers most installations if the noise is under 42 dB at the neighbour's window. Listed buildings always need consent. Read our noise guide for details.
Can I install a heat pump on a listed building?
Yes, with listed building consent. Apply to your local planning authority. Allow 8 to 12 weeks. Rear placement and screening improve your chances.
What is the noise limit for heat pumps?
42 dB(A) at 1 metre from the nearest neighbour's habitable room window. Most units meet this at 3+ metres distance. See our noise guide.
Can I put a heat pump in the front garden?
In most areas, yes. In conservation areas, it must not be visible from the highway. Rear or side placement is generally preferred.
Do I need planning permission in Scotland or Wales?
Similar permitted development rules apply with minor differences. Check with your local planning authority for current rules.
Data sources
Planning rules from GOV.UK permitted development guidance. Listed building rules from Historic England.