How Far Should a Heat Pump Be from the House?
Close to the house but away from the boundary — that is the sweet spot. Heat pump positioning is a balance between planning rules, noise considerations, airflow requirements, and practical pipework routing. Get it right and your system runs quietly and efficiently. Get it wrong and you could face planning issues, neighbour complaints, or reduced performance.
This guide covers the UK's permitted development rules, noise requirements, airflow needs, and the practical considerations that determine where your heat pump goes.
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Permitted Development Rules
Most domestic air source heat pump installations do not need planning permission if they meet the permitted development conditions. The table below shows the rules for England since 29 May 2025, when the old requirement to keep the unit at least 1 metre from the boundary was removed (SI 2025/560). Wales and Scotland have their own rules, so check with your local planning authority there.
| Condition | Requirement |
|---|---|
| Distance from boundary | No minimum in England since 29 May 2025 (the old 1 metre rule was removed) |
| Location | Not on a pitched roof; a unit on a flat roof must be more than 1 metre from the roof edge |
| Number of units | Up to 2 on a detached house; 1 on other houses |
| Volume | Outdoor unit up to 1.5m³ for a house (0.6m³ for a block of flats) |
| Noise at nearest window | Must pass the MCS 020(a) noise assessment |
| Listed buildings | Not permitted — planning permission required |
| Conservation areas | Not on a wall fronting a highway — additional restrictions apply |
Noise Requirements
Noise is often the biggest concern for homeowners and neighbours. Modern heat pumps are significantly quieter than older models:
Your MCS-certified installer must carry out a noise assessment as part of the system design, confirming that the noise level at the nearest neighbour's habitable room window meets the MCS 020 standard.
Airflow and Performance
An air source heat pump extracts heat from the air, so it needs good airflow around the unit:
- Fan outlet: At least 1-2 metres clear space in front of the fan (the side that blows cold air)
- Sides and rear: At least 300mm clearance for air intake
- Above: No overhanging structures that restrict airflow
- Avoid recesses: Placing a heat pump in a tight alleyway can cause recirculation of cold exhaust air, reducing efficiency
Restricted airflow forces the heat pump to work harder, reduces efficiency, and can cause the unit to ice up more frequently in winter.
Practical Considerations
- Short pipework runs: The closer to the house wall, the shorter the pipe run and the less heat is lost in transit
- Base preparation: The ground must be suitable for a concrete pad or slab
- Access for maintenance: Engineers need to reach the unit for annual servicing
- Drainage: The unit produces condensate during defrost cycles — drainage away from the house is needed
- Aesthetics: Many homeowners prefer the unit out of sight, but this must not compromise airflow or access
- Overall siting: For trade-offs between walls, gardens and sun or shade, see our guide to the best position for an air source heat pump
Not sure where your heat pump should go?
Start with a cost estimateThen request a heat pump quote; the installer's survey plans the position.
Special Cases
- Terraced houses: Limited side access often means the rear garden is the only option. Noise to neighbours requires careful attention. See our guide on compatibility considerations
- Flats: Ground-floor flats with garden access may be suitable. Upper-floor flats generally require planning permission and landlord/freeholder consent
- Listed buildings: Planning permission is always required. Positioning the unit out of sight may satisfy the planning authority
- Conservation areas: Additional restrictions apply — particularly for units visible from the highway
If you are also considering solar panels, your installer can plan both systems together to ensure the heat pump position does not conflict with solar panel placement or scaffolding access.
Frequently Asked Questions
How close can a heat pump be to a boundary?
In England there is no longer a minimum boundary distance: the old 1 metre rule was removed on 29 May 2025. The unit must still pass the MCS 020(a) noise assessment, which is harder to meet close to a neighbour's window. Wales and Scotland have their own rules, so check with your local planning authority there.
Does a heat pump need planning permission?
Most domestic installations fall under permitted development — no planning permission needed. Exceptions include listed buildings, conservation areas (with restrictions), and units that cannot meet the standard conditions.
How noisy is a heat pump for neighbours?
Modern units produce 40-50dB at 1 metre — similar to a quiet conversation. At typical boundary distances, this drops to barely noticeable levels. Your installer must confirm compliance with the MCS noise standard.
Can a heat pump go at the front of the house?
In a conservation area or World Heritage Site, not under permitted development if the unit is on a wall or roof fronting a highway. Most units go at the side or rear anyway. If you are unsure, check with your local planning authority.
Get expert positioning advice for your property
Request a heat pump quoteMCS-certified installers plan the optimal position as part of every survey.
About Heat Pump Positioning and Planning Rules
Heat pump positioning in the UK is governed by permitted development conditions that balance homeowner benefits with neighbour amenity. In England the old 1-metre boundary rule was removed on 29 May 2025; noise standards, the outdoor unit size limit, and airflow requirements still keep installations effective and considerate. MCS-certified installers carry out noise assessments and positioning plans as standard. The UK government has relaxed planning rules for heat pumps to accelerate adoption, and when combined with solar panel installations, homeowners can create a comprehensive low-carbon energy system.