If you’ve looked into getting a heat pump in the past but hit a wall due to limited outdoor space, planning permission issues, or the need for a larger unit, 2025 could be your turning point. From 29th May 2025, updated rules will remove many of the planning restrictions that previously made installing a heat pump a slow, costly, and sometimes frustrating process.
This is excellent news for homeowners and landlords who were previously excluded by tight boundaries or the need for double-sized units. These changes are designed to cut the red tape, reduce costs, and open the door to cleaner, quieter, and more energy-efficient heating for more UK homes.
Let’s look at what’s changing, how it affects you, and what your next steps should be if you’re considering a heat pump in 2025.
To discover more about how heat pumps work and how they can benefit your home or business, see our air source heat pumps page and our blog. If you have a question or would like to book a discovery call, please get in touch.
Key changes to permitted development rights for heat pumps (effective 29th May 2025)
Before these new rules, all of the following were technically possible, but required planning permission. And whether you got that permission was often down to local council policies. In many areas, decisions were inconsistent, time-consuming, and sometimes overly strict. These changes aim to simplify things across the board.
Here’s what’s new:
- Install closer to your boundary: The old rules stated that an air source heat pump must be installed at least one metre the property boundary. This has been scrapped in the new rules, meaning that you can install a heat pump close to your boundary. This removes a key barrier for homes with smaller outdoor areas.
- Bigger units permitted: The allowable size for an external unit is increasing from 0.6m³ to 1.5m³, which is great news for larger properties or homes with higher heating demands.
- Two heat pumps allowed: If you live in a detached property, you’ll be able to install two heat pumps without needing planning approval – ideal for zoned heating or pairing a standard and hot water unit.
- Air-to-air systems included: Air-to-air heat pumps, which can both heat and cool your home, are now covered by permitted development rights.
- Stricter noise standards: While the 42 db noise limit remains, tougher MCS Planning Standards now apply to ensure systems are quiet even during peak operation. This means less risk of noise complaints and more confidence for you and your neighbours.
Along with other government initiatives like the Boiler Upgrade Scheme (which provides £7,500 to eligible homes) and the Clean Heat Market Mechanism (CHMM) (which encourages boiler manufacturers to sell more low-carbon heating solutions), these changes promise to streamline installations and make heat pump technology more affordable and accessible across England.
What does this mean for homeowners?
This change doesn’t just mean fewer forms to fill in. It makes a huge difference to many people who’ve wanted a heat pump, but couldn’t get one before.
Here’s how different homeowners and landlords could benefit:
- Urban and terraced homeowners: Previously, space constraints near boundaries made installation difficult or impossible. Now, more compact installations closer to property lines will be allowed.
- Owners of large, high-demand homes: With larger units and dual installations now permitted for detached homes, it’s easier to size systems correctly for comfort and efficiency.
- Landlords of family homes or HMOs: Faster installation, fewer planning delays, and simpler admin make upgrades more cost-effective and less disruptive to tenants.
The benefits to all sorts of property owners are clear:
- Quicker installation: No need to wait around for planning approvals.
- Save money: No planning fees, consultant costs, or unexpected delays.
- More choice for larger, detached homes: Bigger, more powerful heat pump units can now be installed, perfect for larger properties.
- More homes are eligible: Previously, some properties were ruled out just because of tight garden spaces, which will no longer be an issue.
It’s a big boost for anyone thinking about switching to renewable energy and making their home future-ready with a heat pump system.
As a homeowner, what should I do next if I’m considering an air source heat pump installation?
If you are looking to install an air source heat pump, the new rules are definitely in your favour:
- Arrange a professional survey: Book an experienced engineer at Cinergi, we can carry out a heat loss survey and asses your heating and hot water requirements. Factors such as available outdoor space, insulation levels, and compatibility with underfloor heating systems are key.
- Time your project carefully: Plan installation after 29th May 2025 to take full advantage of the new relaxed planning permissions.
- Explore heat pump grants: Government grants like the Boiler Upgrade Scheme offer substantial financial support for air and ground source heat pumps.
- Consider pairing with solar panels: Pairing solar panels with your air source heat pump helps cut costs, as the unit runs on electricity, which solar panels can provide for free during daylight hours.
- Think long-term: Choose smart tariffs to heat your home during off-peak times, to help maximise energy savings.
A well-designed heat pump system is an investment in lower energy bills, reduced carbon emissions, and a more comfortable home all year round, even in colder weather.
How can Cinergi help you?
At Cinergi, we are passionate about delivering sustainable home heating solutions tailored to your property and energy needs. We’ve helped many customers make the move from gas boilers to air source heat pumps and ground source heat pumps, and we’re excited about how these new regulations will speed up the installation process and make the technology more widely available.
Contact us today to ask us a question or book a discovery call.
Frequently asked questions – do I need planning permission to install a heat pump?
The government announced the changes following a consultation by The Department for Levelling Up, Housing and Communities (DLUHC) in 2023, which was signed off shortly after. The official guidance will be published on the UK Government’s Planning Portal and through the DLUHC. It will also link to updates from organisations like the Microgeneration Certification Scheme and Clean Heat Market guidance.
No, these changes to planning regulations only apply in England. Homeowners in Wales, Scotland, and Northern Ireland will need to check local planning requirements if they want to install heat pumps.
Following 29 May 2025, you may still require planning permission for an ASHP if:
– Your property is listed, in a conservation area, or a World Heritage site
– You live in a designated area of outstanding natural beauty
– Your installation is unusually large, involves structural changes, or exceeds the new development limits
– You’re part of a block of flats or maisonettes (permitted development rights are more restricted)
If in doubt, speak to your installer or check with your local planning authority.
Yes. While planning permission may no longer be necessary in many cases, compliance with building regulations is still essential. These cover safety standards for electrical systems, ventilation, noise control, and energy efficiency. Professional installers like Cinergi will ensure your installation meets all of these.
Ground source heat pumps are still subject to existing permitted development rules and are not affected by the May 2025 changes. However, many small installs already qualify without planning permission, provided certain conditions are met. If a project involves major excavation, multiple boreholes, or is located in sensitive areas (like a listed building site), planning permission may still be required.
The rules for installing a heat pump on a roof remain unchanged. Outdoor units can only be placed on a flat roof, not a pitched roof. And the heat pump must be at least one metre from the external edge of the roof.
You cannot install a heat pump on a roof in a conservation area, World Heritage Site, or on a wall or roof facing a highway. While many roof installations do not require planning permission, you will need it if your property is a listed building or a scheduled monument.
The information in this article is provided for general guidance only and reflects planning regulations as of May 2025 in England. While every effort has been made to ensure accuracy, rules can vary depending on local authorities and specific property circumstances (e.g. listed buildings, conservation areas, or flats). We recommend speaking to a qualified installer or your local planning office to confirm how the regulations apply to your home or rental property before proceeding with any installation.
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