UK rule alert for anyone wanting air conditioning at home

As temperatures rocket this summer, numerous homeowners have sought relief from the heat by fitting an air conditioning unit, assuming the installation does not require planning permission. However, according to one expert, they could be falling victim to a widespread misconception.

John Van-Eker, principal planning consultant with Planning Portal’s Planning Guidance Service, a joint venture between the Ministry of Housing, Communities and Local Government and TerraQuest, has warned that homeowners could be caught off guard.

He said: “Because of widespread misinformation online, homeowners may not realise that they actually need to submit an application for planning permission to install an air con unit – potentially landing them in hot water if they didn’t receive approval.

“Although homeowners are allowed to make certain home improvements without planning permission under permitted development rights, installing an air con unit is not actually covered, despite the misconception. As a result, residents will need to apply to their local authority and wait up to eight weeks for the green light – which can seem a long time during a heatwave.”

While swapping a desk fan for a permanent cooling system may appear to be an appealing solution to this summer’s record-breaking temperatures, installing one without the relevant authorisation can carry serious repercussions. Committing a planning breach – even unintentionally – can leave homeowners compelled to submit a retrospective application.

Should this be rejected, the council can issue an enforcement notice demanding the air conditioning unit be taken down. Defying this order is illegal and, if disregarded, could ultimately lead to prosecution.

Fitting a permanent air con unit without planning permission can also carry considerable implications should the homeowner decide to put the property on the market. To finalise any sale, sellers must demonstrate that they obtained the requisite approvals.

Without this, homeowners will be required to either lodge a retrospective application or remove the alteration entirely.

John continued: “If your home already has a permanent aircon unit installed and you need to replace it, if you’ve chosen a like-for-like model then you don’t need to apply. However, if you’re looking to upgrade to a larger, more powerful unit, you will need to submit an application via the Planning Portal website.

“Installing an air con unit isn’t the only way that homeowners can keep their home cool during the summer months. Recent changes to permitted development rights in May 2025 mean it is now easier to install a heat pump on your property. This is capable of both heating and cooling a building all year round, so residents are always comfortable.

“Misinformation online can easily mislead homeowners into thinking a project is covered by permitted development, when it actually requires an application for planning permission. If you’re considering installing an air conditioning unit or making any home improvements, I’d strongly recommend speaking to an expert or using a verified planning provider, such as Planning Portal’s Planning Guidance Service, so you can move forward with confidence.

“Even though UK summers are getting warmer each year, making sure that you have the necessary permissions to install an air con unit is vital to prevent you from being scorched by the consequences.”