Where can a heat pump go?
Short answer
An outdoor heat pump can usually go in several places around a home, but the location must work technically and comply with planning and noise rules. Longer pipe runs can add cost and heat loss, while poor airflow can reduce performance. Your installer should balance appearance, access, pipe length, drainage and neighbour noise.
Last checked 24 September 2026 · 4 sources
Can I choose where the outdoor unit goes?
Usually, yes, within limits.
The source interview notes that homeowners often have some choice, but moving the unit farther from the hot-water cylinder or heating system means more external pipework.
That can increase material cost and make insulation quality even more important.
Does the unit need lots of space around it?
It needs enough clearance for airflow and servicing. Exact distances depend on the manufacturer.
The installer should avoid boxed-in corners or locations where discharged cold air can recirculate straight back into the unit.
What about condensate water?
Air-source heat pumps create condensate during normal operation, particularly in cold and damp weather.
That water should be managed properly. A drain, gully or soakaway may be needed depending on the site and manufacturer instructions.
Poor drainage can lead to pooling water or ice around the unit.
Do planning rules restrict the location?
Yes, but the exact rules differ across the UK.
In England, domestic air-source heat pumps can often be installed under permitted development if the conditions are met. Current rules allow larger units than before and removed the old one-metre boundary rule for qualifying installations.
Wales updated its domestic permitted-development rules on 1 June 2026. Scotland has separate rules, including restrictions for conservation areas, listed-building curtilage and prominent roadside locations.
Your installer should check the current rules for your nation and local planning authority.
Can the unit go close to a neighbour?
Potentially, if the installation meets the relevant planning and MCS noise standard.
Noise is assessed against the nearest affected window rather than by relying on a simple distance rule alone.
What should I do next?
Before agreeing a location, ask your installer to show you:
- the proposed pipe route;
- airflow clearances;
- the condensate route;
- the noise assessment;
- the planning basis for the location;
- access for future servicing.
Sources
- Source interview with Heat Geek installer, outdoor-unit placement discussion.
- Planning Portal, Air source heat pump — planning permission, checked 24 September 2026.
- GOV.WALES, Planning permission: domestic heat pumps, updated rules effective 1 June 2026.
- Scottish Government, Planning circular 1/2024: householder permitted development rights.
Last checked: 24 September 2026