Bath: 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 Bath whatever the property, because on its own it only cools.

So the system you choose changes your planning path in Bath, not just your comfort. The same box that both heats and cools opens the permitted-development route on a house; a unit that only cools does not. With around 34% of Bath's EPC-certified stock inside a conservation area (Monkton Combe, Newton St Loe, Pensford among them), confirming the exact boundary before you site an outdoor unit is the single most valuable planning step to take here.

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 Bath flat will usually need both freeholder or managing-agent consent and planning permission.

Conservation-area coverage runs high in Bath - about 34.2% of properties sit inside one, including Monkton Combe, Newton St Loe and Pensford. That tightens or removes the usual permitted-development right for a house, so an outdoor unit facing the street will typically need Bath and North East Somerset Council to approve planning permission first.

Across all development types, Bath and North East Somerset has decided 63 planning applications mentioning air conditioning or other cooling plant - 12 of them householder applications - and approved 98.4% of the 63.

The same figures as counts are 62 approved and 1 refused.

A householder-only rate would be the more useful number, and Bath and North East Somerset has not yet decided enough of them for one: 12 is below the sample size we publish a percentage from.

One more thing about the method: applications are identified from their own description, so the Bath figures cover applications mentioning cooling equipment and will understate rather than overstate real activity.

Bath and North East Somerset has also decided 106 applications mentioning an air-source heat pump, 96.2% of them approved. That is a separate measure from the cooling figures above, since most air-source installations heat rather than cool and the two sets overlap.

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.

The Bath property types we profile average roughly 44 dB of daytime background noise, and a unit is judged against that baseline rather than in the abstract.

So siting decides more than the equipment does. Moving the outdoor unit away from a neighbour's window and off the boundary line is the single change that most often rescues a borderline application.

Nothing here is a dealbreaker. Bath's council approves outdoor units for homes like these routinely. Conservation-area coverage locally runs at around 34.2%, which makes this worth planning for rather than assuming. Proximity to a listed building - around 14.6% of homes here sit within 30 metres of one does not mean your own home is listed, and public data can flag a conservation-area question without answering it. Treat this as indicative guidance, not legal advice, and confirm the final position with your Local Planning Authority before installing.