As the UK experiences record-breaking temperatures this summer, many homeowners have rushed to install air conditioning units, believing no planning permission is needed. However, according to John Van-Eker, principal planning consultant with Planning Portal's Planning Guidance Service, this is a widespread misconception that could land homeowners in trouble.
Van-Eker stated: "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."
Permitted Development Rights Do Not Cover Air Conditioning
While homeowners can make certain improvements without planning permission under permitted development rights, installing an air conditioning unit is not included. Residents must apply to their local authority and wait up to eight weeks for approval, which can feel lengthy during a heatwave.
Consequences of Installing Without Permission
Breaching planning regulations, even unintentionally, can lead to serious repercussions. Homeowners may need to submit a retrospective application. If denied, the council can issue an enforcement notice demanding removal. Ignoring this notice is illegal and can result in prosecution.
Additionally, selling a property with an unauthorised air conditioning unit can complicate the sale. Sellers must demonstrate required approvals; without them, they must either lodge a retrospective application or remove the unit.
Replacement Units and Heat Pumps
Van-Eker clarified: "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."
Recent changes to permitted development rights in May 2025 have made it easier to install heat pumps, which can both heat and cool homes year-round, offering an alternative to air conditioning.
Expert Advice
Van-Eker emphasised: "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 as UK summers grow warmer, ensuring proper permissions for air conditioning installation is vital to avoid legal and financial consequences.
