From 29 May 2025, the UK government introduced relaxed planning rules for air source heat pumps in England. These changes are designed to make it easier, faster, and more affordable for homeowners to install a heat pump, especially in properties where space or planning restrictions previously caused issues.
For those looking for Heat pump grants in Cheshire, or anywhere in England, here’s what the new rules mean for you.
The One-Metre Rule Has Been Scrapped
Previously, if your heat pump was located within one metre of your boundary or a neighbour’s property, you needed to apply for planning permission. This rule has now been removed. Homeowners can install a heat pump closer to the edge of their property, which is particularly helpful for smaller gardens or urban homes where space is tight.
Larger Units Now Allowed
The new rules increase the maximum size of permitted heat pumps from 0.6 cubic metres to 1.5 cubic metres per unit. This means more powerful, higher-capacity systems can now be installed under permitted development rights, without requiring special approval.
Two Units Permitted for Detached Homes
Detached homes are now allowed to install two heat pump units without needing planning permission. This is ideal for properties that require larger systems or want to use separate units for hot water and heating. Semi-detached and terraced homes can still install one unit without needing permission, which suits the majority of residential setups.
Cooling Systems Now Included
Previously, permitted development rules focused primarily on heating. The new changes also cover systems that provide cooling. This means air-to-air heat pumps that deliver both heating and cooling can now be installed more easily, giving homeowners added comfort year-round.
Noise Restrictions Still Apply
Although the rules are more relaxed in terms of placement and size, there are still noise regulations in place. Heat pumps must operate below a certain decibel limit when measured from the nearest neighbouring property. Installers will continue to assess this during planning to ensure systems remain quiet and compliant.
What This Means for Homeowners
These changes significantly reduce the barriers to installing a heat pump. Homeowners no longer need to deal with lengthy planning applications, which speeds up the installation process and cuts down on paperwork and potential costs. It also means more homes — especially those in tighter urban areas — are now eligible for heat pump installation.
With larger units now allowed and the ability to install more than one system on some properties, households with greater heating demands can enjoy the benefits of heat pump technology. And with cooling systems now included, homeowners can invest in year-round comfort without additional permissions.
Final Thoughts
The 2025 rule changes are a major step forward in helping more households move to low-carbon heating. As the UK transitions away from fossil fuels, reducing red tape is essential in making greener technologies like heat pumps more accessible. For anyone considering a heat pump, now is a much easier and more sensible time to make the switch.