Do you need planning permission for air conditioning?
It's become one of summer 2026's surprise headlines: councils ordering homeowners to remove air-conditioning units they'd already installed. So before you fix a box to your wall, it's worth understanding the rules — and why a discreet system can save you the headache entirely.
Quick disclaimer first: planning is decided locally and every property is different, so always confirm with your own council. But here's the general picture for England in 2026.
The general rule
For many ordinary houses, a single, sensibly-sized external unit can fall under "permitted development" — meaning no planning application — provided it meets all the conditions. Typically that means the unit:
- is below a set size (often quoted around 0.6m³),
- sits a minimum distance from your boundary,
- isn't on a wall or roof facing (and close to) a highway, and
- doesn't materially change the appearance of the building.
Miss any one of those and you may need permission. This is exactly where people come unstuck.
When you almost always need permission
- Listed buildings. There are no exceptions and no permitted development — you'll need planning permission and a separate Listed Building Consent.
- Conservation areas. Tighter rules apply, and visible units are frequently refused.
- Flats and maisonettes. Permitted development rights generally don't apply, so you'll usually need consent.
- Larger or multiple units. Bigger systems and several condensers typically need a formal application.
How discreet systems sidestep the problem
The planning issues almost always come down to one thing: visible external kit. That's the core advantage of a small-duct, high-velocity system like Custom Comfort:
- No rows of wall-mounted indoor heads.
- A compact, hidden air handler instead of bulky internal units.
- Slim ducts concealed inside the building fabric, with neat, barely-there outlets.
- A minimal external footprint compared with multiple split condensers.
That makes it a natural fit for period properties, conservation areas and homes where appearance matters — the very places traditional AC struggles to get approved. It's not a substitute for checking with your council, but it removes the thing they object to most. See how the system hides away →
Got a period or conservation-area home?
We'll advise honestly on what's possible — and design a system that keeps your home's character intact.
Request a callback Get a fixed priceFrequently asked questions
Do I need planning permission for air conditioning on a normal house?
Often not, if a single, modestly-sized external unit meets all the permitted-development conditions and doesn't materially change the building's appearance. Always confirm with your local council.
What about a listed building or conservation area?
Listed buildings always need planning permission plus Listed Building Consent — no exceptions. Conservation areas have tighter rules and visible units are often refused. Discreet, hidden systems are usually the realistic route.
Can a council make me remove an air-con unit?
Yes — if it breaches planning rules, a council can issue an enforcement notice requiring removal. That's exactly why checking first, or choosing a discreet system, matters.
Does Custom Comfort need planning permission?
Because it's hidden inside the building with a minimal external footprint, it avoids the main triggers — but we'll always check your specific situation with you before any work.