Exeter: air conditioning planning permission

Since 2025-05-29, England's permitted-development rules let a house fit an air-to-air heat pump - which heats as well as cools - without a planning application in many cases, within set size, siting and noise limits. A cooling-only air conditioning unit does not get that route and needs a full planning application in Exeter whatever the property, because on its own it only cools.

In Exeter, the system you choose is a planning decision as much as a comfort one. An air-to-air heat pump on a house qualifies for permitted development because it does both jobs; a unit that only cools is excluded from that route entirely. About 22% of Exeter's EPC-certified stock falls inside a conservation area, concentrated around Exwick, Alphington, Cowick Street; most homes sit outside one, but it is still worth checking the boundary before you commit to a wall-mounted unit.

Flats are the sharpest exception here as everywhere in England: the permitted-development right for an outdoor unit sits with the house, not the flat, so a Exeter flat will usually need both freeholder or managing-agent consent and planning permission.

Neither notably high nor low, Exeter's conservation-area coverage sits around 22.1% of properties, with Exwick, Alphington and Cowick Street among the named areas. That middling figure means your outdoor unit's permitted-development position depends more on exactly where in the borough you are than it would in a more clear-cut area.

The record for Exeter is too thin to publish from. A few decided applications is not a basis for an approval rate, and hedging one into vagueness would be worse than leaving it out.

What actually gets refused, and what councils attach when they approve, is a national picture rather than a local one at the volume of officer reasoning currently published. We set both out with their sample sizes: why cooling applications get refused and the conditions councils attach.

You can also compare what each council decides, where enough decisions exist to publish a figure.

Ambient daytime noise across the Exeter property types we profile averages around 43 dB, and that background level matters as much as the machine's own rating: the same unit that vanishes against a main road can be the loudest thing in a quiet back garden.

Siting is the lever. Keeping the outdoor unit away from a neighbour's window and back from the boundary is what most often turns a marginal case into an approved one.

None of this should put you off. Councils across Exeter approve outdoor units for homes exactly like this all the time. Roughly 22.1% of properties sit inside a conservation area, and it is still a genuine step rather than a rubber stamp. Being near a listed building - around 8.8% of homes here sit within 30 metres of one is not the same as being listed yourself, and public records can raise a conservation-area flag without resolving it. This stays indicative, not legal advice: confirm with your Local Planning Authority before you install.