Heat Pump Planning Permission: 2026 Rules for England, Wales and Scotland

The planning rules for heat pumps in the UK are often misunderstood. Most air source heat pump installations in England fall under permitted development — meaning no planning application is required. But "permitted development" comes with conditions, and some property types, locations, and installation configurations fall outside those conditions and do require formal permission. Here is a clear guide to the current rules.

England: permitted development rights

Under the Town and Country Planning (General Permitted Development) (England) Order 2015 (Schedule 2, Part 14, Class G), air source heat pumps are permitted development provided all of the following conditions are met:

• •Only one air source heat pump is installed on the property
• •The unit is not sited on a wall or roof that faces a highway (front of property rules)
• •The unit is at least one metre from the boundary of the property
• •The noise emitted does not exceed 42 dB(A) at one metre from a neighbour's window or door
• •The installation complies with the MCS 020 planning standard
• •The property is a house (not a flat or maisonette — flats have different rules)

If all conditions are met, work can proceed without any contact with the local planning authority. Your MCS installer should confirm compliance in writing as part of the installation documentation.

When permitted development does not apply

You will need to submit a planning application if any of the following apply:

Conservation areas

Properties in conservation areas do not automatically lose permitted development rights for heat pumps — the rule is more specific: you lose PD rights if the unit would be installed on a wall or roof that is visible from a highway. An air source unit sited discreetly at the rear of a conservation area property, not visible from any road or footpath, can still qualify as permitted development in many cases. However, practice varies by local authority, and it is worth a pre-application enquiry to confirm the position before commissioning a survey.

Where a planning application is required in a conservation area, permission is usually granted for rear installations. The planning officer's main concerns are typically visual impact from public vantage points and noise. A well-sited unit with a noise assessment is likely to be approved.

Listed buildings

Listed buildings require Listed Building Consent (LBC) for any works that affect the character of the listed structure. Externally mounted heat pump units on a listed building almost always trigger this requirement. The process involves a LBC application (which is free), assessment by the conservation officer, and usually a heritage impact assessment from the applicant demonstrating that the works are reversible and minimal in impact. Lead times are typically 8–13 weeks.

Some historic environment bodies have published guidance supportive of renewable energy installations on listed buildings where the impact is minimal and reversible. Ground source heat pumps — where the only visible element is a small manifold cabinet — are generally more sympathetically viewed for listed properties than externally visible air source units.

Wales

Wales uses similar but not identical rules to England. Air source heat pumps are permitted development under the Town and Country Planning (General Permitted Development) Order 1995 (as amended for Wales). The noise limit is the same (42 dB(A)); the boundary distance and highway facing rules also apply. Welsh government guidance on heat pumps in conservation areas and listed buildings can be found via the Planning Portal (Wales).

Scotland

Scotland's planning system is separately legislated. Air source heat pumps in Scotland are permitted development under the Town and Country Planning (General Permitted Development) (Scotland) Amendment Order 2011, with conditions broadly similar to England but with Scotland-specific definitions of protected areas. The MCS 020 standard applies in Scotland as in the rest of Great Britain. Contact your local planning authority or check the ePlanning Scotland portal for property-specific guidance.

Making a planning application

If a planning application is required, it is submitted via the Planning Portal (planningportal.co.uk in England and Wales) or ePlanning Scotland. Applications cost £206 in England (as of 2026) for a householder planning application. Most installers can provide the necessary supporting documents (site plans, noise assessments, product specifications) as part of their service. The standard determination period is 8 weeks.