Heat Pump Planning Permission: Do You Need It?

Most UK homeowners can install a heat pump without planning permission thanks to permitted development rights. But there are conditions, and some properties — listed buildings, conservation areas, flats — need to take a different route. Here's what applies to your situation.

Permitted Development: The Short Version

In England, air source heat pumps are classed as permitted development. This means you don't need to submit a planning application — provided you meet all the conditions. The rules were specifically relaxed to encourage heat pump adoption as part of the UK's net zero strategy.

Conditions for Permitted Development (ASHP)

All of these must be met:

Ground Source Heat Pumps

Ground source heat pump installations — including horizontal trenching and vertical boreholes — are generally permitted development. The ground loops are buried and invisible once installed, with no noise impact. There are no specific restrictions on garden excavation for domestic GSHP installations in most areas.

However, if your property is in an area of archaeological importance or a Site of Special Scientific Interest (SSSI), you should check with your local authority before drilling boreholes.

Conservation Areas

If your home is in a conservation area, permitted development rights are more restricted. The key concern is visual impact:

• The outdoor unit must not be visible from a highway (road, path, or waterway)
• If it would be visible, you'll need to apply for planning permission
• Rear or side positions hidden behind fencing are usually acceptable
• Acoustic enclosures or screening may help with visual concerns

In practice, many conservation area installations proceed smoothly by positioning the unit out of public view. Your installer should be familiar with local requirements.

Listed Buildings

Installing a heat pump on or near a listed building almost always requires:

• Listed building consent — for any alterations that affect the building's character (including external pipework, wall penetrations, and the outdoor unit)
• Planning permission — may be needed in addition to listed building consent
• Early engagement with your local conservation officer to discuss feasibility

It's not impossible — many listed buildings have successfully installed heat pumps — but the process takes longer and may require creative positioning. Ground source heat pumps are often a better fit for listed buildings since the outdoor visual impact is minimal.

Flats and Apartments

If you live in a flat, permitted development rights for heat pumps are more limited. You'll typically need:

• Permission from the freeholder or management company
• Planning permission if the unit would be visible from a public area
• Agreement from neighbours regarding noise
• A suitable location for the outdoor unit (balcony, communal area, or ground level)

Scotland, Wales, and Northern Ireland

Permitted development rules vary by nation:

• Scotland: Similar permitted development rights for ASHPs, with comparable noise and size conditions. Check with your local authority.
• Wales: The BUS grant applies, and permitted development rights are broadly similar to England.
• Northern Ireland: Currently has more limited permitted development rights for heat pumps. Planning permission is more likely to be required.

The MCS 020 Noise Assessment

Every MCS-certified installation includes a noise assessment per the MCS 020 Planning Standard. This is a calculation (not a physical measurement) that predicts the noise level at the nearest neighbour's window based on:

• The sound power level of the specific heat pump model
• Distance from the unit to the assessment point
• Reflective surfaces (walls, fences) that could amplify sound
• Any barriers or screening that reduce sound

If the result exceeds 42 dB(A), the installer must modify the design — choose a quieter model, reposition the unit, or add acoustic mitigation. Learn more in our heat pump noise guide.

What to Do If You're Unsure

1. Check your property's designation — is it listed, in a conservation area, or an AONB?
2. Contact your local planning authority — a quick call or email can confirm whether permitted development applies
3. Ask your MCS installer — they deal with planning requirements daily and can advise based on your specific property
4. Consider a pre-application enquiry — some councils offer this for free or a small fee, giving you a written opinion before committing

Frequently Asked Questions