In partnership with Arlow Plumbing & Heating
Do I need planning permission for an ASHP?
Somerset Heat Pump & Solar installer
Do I need planning permission for an ASHP?
Good news! The government has made it easier to install heat pumps by relaxing the rules—most installations now fall under permitted development.
Here are the key points:
– You can now place your heat pump as close to your property boundary as you like.
– If your heat pump is mounted above ground level, it must not be visible from the road frontage.
– If you have a detached home and need multiple heat pumps (a cascade system), you’re allowed to install them as long as the total unit size stays under 1.5m³. If it’s larger, you’ll need to submit a planning application. In most cases, this covers two twin-fan units.
A few important things to keep in mind:
– You’ll still need to pass a sound assessment.
– Manufacturer and refrigerant clearances still apply
– Permitted development doesn’t apply to conservation areas or certain listed buildings, so it’s always best to check with your local planning authority to confirm the rules for your property.
And one crucial reminder:
If your installation requires planning permission, it’s your responsibility as the homeowner to apply for it—not your installer’s. If permission isn’t secured when needed, your local planning department could ask you to relocate or even remove the unit.
Of course, as your installer, we’re here to guide and support you as much as possible.

Compress 3400i AWS
Our 3400i AWS is available in 4, 6, 8 and 10kW outputs. Our quiet, space-saving outdoor units are suitable for renovation (building dependent) and new build projects providing a solution for maximising garden space.
£2000
Inc controls & system protection

Compress 2000 AWF
CS2000 AWF is an all-in-one full monobloc heat pump solution, built to speed up and simplify installation. With a space-saving footprint, it’s perfect for smaller outdoor spaces at just 2m2, suitable for renovations and new builds alike.
£2370
Inc controls & system protection

Compress 5800i AW
Designed for UK homes, the brand new CS5800i range is designed for new build and renovation projects alike – making it easier than ever to bring electrified home heating to your customers.
£2560
Inc controls & system protection