Do You Need Planning Permission for Air Conditioning? UK Rules Explained

In England, many fixed domestic air conditioning systems that both heat and cool can be installed under permitted development, so you often don't need a planning application. Cooling-only units, listed buildings, highway-facing positions in conservation areas and non-domestic premises usually need planning permission. Building regulations, F-Gas certification and landlord permission can still apply. Your local council gives the definitive answer.

Many domestic systems fall under permitted development, so you often don't need planning permission, but important exceptions apply. This guide covers England, including Leicester and the wider area we serve, because the rules differ in Scotland, Wales, and Northern Ireland. It is general guidance, not legal or planning advice.

When is air conditioning permitted development?

Permitted development means you can carry out certain work without a planning application, provided you meet all limits and conditions. Air conditioning permitted development falls under Class G of Part 14 of the General Permitted Development Order, as amended in 2025. 

Permitted development is a set of conditions, not a blanket exemption. You must meet every condition at the same time.

What conditions does an external unit have to meet?

We review six areas on every survey for domestic air conditioning:

• Size: the outdoor unit must fall within a maximum volume set in the Order.

• Siting: the unit should be placed, as far as practicable, where it has the least impact on the building and the area.

• Roof: units on pitched roofs are not permitted development, and flat-roof positions have their own edge condition.

• Highway-facing walls: outside conservation areas, a unit cannot extend above ground-floor level on a wall facing a road.

• Number of units: the Order limits how many outdoor units a property can have, and it treats a block of flats as one property.

• Noise: the installation must meet the Microgeneration Certification Scheme planning standard (MCS 020 a).

Does it matter whether the unit only cools?

Yes, and this catches many buyers out. The 2025 amendment extended permitted development rights to air-to-air heat pumps that heat and cool. A unit that only cools does not benefit from these rights, so it needs a planning application.

Many modern split systems are reversible air-to-air heat pumps, which heat and cool from the same outdoor unit. Cooling-only models are less common in homes, but they do exist. When you compare quotes, ask us to confirm that the system on your air conditioning installation quote is reversible.

A reversible air-to-air heat pump may fall under permitted development, whereas a cooling-only unit may not.

When do you need planning permission for air conditioning?

You need to apply when your property or plan falls outside the permitted development conditions. If you are asking whether you need planning permission for air conditioning in an unusual building, the answer usually depends on the property's status. These are the situations we see most often across Leicester, Loughborough, Hinckley, Market Harborough and the wider Midlands.

Listed buildings

Permitted development does not apply to listed buildings or scheduled monuments, so you will need planning permission. You will usually also need listed building consent, because fixing brackets, drilling for pipework and mounting a unit can all count as alterations. We recommend speaking to your council's conservation officer before you commit to a system.

Conservation areas

Permitted development can still apply in a conservation area, but the rules are stricter. The unit must not go on a wall or roof that faces a highway, or sit closer to the highway than any part of the building. Councils can also remove these rights with an Article 4 Direction, so ask yours whether one covers your street.

Flats and maisonettes

The rights apply to a block that consists wholly of flats, not to a building that includes commercial premises. Because a block counts as one property, an existing unit elsewhere on the block may mean you need to apply. Maisonettes and converted properties vary, so check your building's status before ordering equipment.

Units facing or near a highway

Highway-facing positions often turn a simple installation into a planning matter. Moving the outdoor unit to a side or rear wall can remove the problem. During a survey, we look at alternative positions before recommending an application.

Freeholder and landlord consent

Planning permission is not the same as permission from your freeholder or landlord. If you rent, or own a leasehold flat, your lease may prohibit external alterations even where planning rules allow them. Read your lease and ask in writing before you proceed.

Listed buildings always need permission, while conservation areas, flats and cooling-only units depend on the details. Lease consent is a separate question.

Do building regulations apply to air conditioning?

Yes, building regulations can still apply when planning permission does not. Planning controls how a development looks and affects its surroundings. Building regulations control how safely and efficiently the work is carried out. Your air conditioning building regulations obligations depend on the scope of the job.

The main areas are:

• Electrical work: a new circuit in a dwelling falls under Approved Document P. An electrician registered with a competent person scheme must do it, or you must notify building control.

• Structural penetrations: drilling through external walls can affect the structure. Approved Document A covers structural safety, and larger openings may need support.

• Energy efficiency: Approved Document L covers fixed building services, including heating and cooling systems.

Whether each one applies depends on your project, so confirm with your building control body before work begins. We can't judge from a distance whether a particular job needs notification. A survey lets us check the wiring, wall construction, and unit position, then explain which rules are likely to apply.

Planning permission and building regulations are separate, so a project can meet one but still need the other.

What are F-Gas regulations and why must your installer be certified?

F-Gas regulations control fluorinated greenhouse gases, the refrigerants used in most air conditioning systems. They exist because these gases contribute to climate change if they leak. Great Britain follows its own version of the F-Gas Regulation, inherited from EU law, and the current text is published on legislation.gov.uk.

The law requires certification at two levels:

• The engineer must hold the correct personal F-Gas qualification for the work.

• The business must hold company certification through an approved scheme such as Refcom.

Refrigerant work includes installation, servicing, leak checking, repairs, recovery and decommissioning. Certified installers are trained to prevent leaks that harm your system and the environment. Ask every installer you consider for both certificates. If they can't provide them, look elsewhere.

Only certified engineers at a certified company should do refrigerant work, and you are entitled to see the evidence.

Do businesses need planning permission for air conditioning?

Usually, yes. Domestic permitted development rights don't cover non-domestic premises, so shops, offices, and other commercial units generally need a planning application.

Three practical points apply to business owners:

• Noise: your council may set conditions to protect neighbours, particularly near homes.

• Landlord consent: if you lease your premises, you will almost certainly need written permission.

• Local requirements: Leicester City Council or your district council can explain what an application needs.

For system options, see our commercial air conditioning and commercial ventilation services.

Business premises generally need a planning application, so speak to your council early.

What are the key takeaways on air conditioning planning permission, building regulations and F-Gas?

• Planning: many reversible domestic systems in England can be permitted development. Cooling-only units cannot.

• Restrictions: listed buildings need permission, and conservation areas and flats have stricter conditions.

• Building regulations: electrical, structural and energy rules can apply without planning permission.

• F-Gas: refrigerant work needs certified engineers and a certified company.

• Consent: you need separate permission from the landlord or freeholder.

• Final check: your council and a site survey give the definitive answer.

How can we assess your property?

Most planning problems are easy to avoid if you spot them before ordering the equipment. A free survey lets us check your building type, the best outdoor unit positions, the wall and wiring conditions, and any listed, conservation or leasehold restrictions. You then know exactly what applies to your property before you spend anything.

Our survey doesn't replace a decision from your council. It does mean you go to them with clear facts, the right system, and a compliant position already planned. Our certified engineers carry out every installation, backed by our warranty and care plans, and you can see recent installations on our work page.

Book your free survey today, and we'll tell you whether your installation is likely to need planning permission. We'll also recommend the right system and plan a position that keeps the paperwork to a minimum. To get started, make an air conditioning installation enquiry or contact our team.

How can you contact us?

To book your free survey, call Leicester Air Conditioning Services Ltd on 0116 403 0540 or send us a message through our contact page. We'll talk you through the next steps and arrange a visit to assess your property.

Frequently asked questions

Do you need planning permission for air conditioning?

In England, you often don't need planning permission for air conditioning if the system heats and cools and is fitted to a house or block of flats. This is permitted development for air conditioning, and it applies only when size, siting, and noise conditions are met. Cooling-only units and listed buildings are key exceptions.

Do you need planning permission for air conditioning in the UK?

It depends on where you live. Air conditioning regulations vary across the UK because planning is devolved. This guide covers England, where many reversible domestic systems qualify as permitted development. Scotland, Wales, and Northern Ireland set their own rules, so check with your local planning authority before installing air conditioning.

Do air conditioning units require planning permission?

Not always. A reversible air conditioning unit that meets the permitted development conditions usually doesn't need an application. A cooling-only outdoor unit does, as do installations on listed buildings, on highway-facing walls in conservation areas, and at most business premises. Where the installation position breaks a condition, moving the unit can sometimes avoid an application.

Do I need planning permission for air conditioning in a flat or listed building?

For a listed building, yes. Permitted development does not apply, so you need planning permission and usually listed building consent. For a flat, permitted development may apply if the block consists wholly of flats and has no existing heat pump, but your lease may still require freeholder consent before you install one.

Does air conditioning need to comply with building regulations?

Yes, in many cases. Building regulations can apply to air conditioning even when planning permission does not. New electrical circuits fall under Part P, wall openings under Part A, and system efficiency under Part L. Which parts apply depends on the job, so confirm with your installer or building control body.

Do F-Gas regulations apply to air conditioning installation?

Yes. F-Gas regulations require anyone installing, servicing, or decommissioning air conditioning that contains fluorinated refrigerant to hold the right personal certification, and the business must also hold company certification. Always ask your installer for both certificates before work starts, because uncertified refrigerant work is illegal and can leave you with a leaking system.