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Do you need planning permission for commercial air conditioning?

Updated 23 October 2026 · SEO Dons Editorial

Is commercial air conditioning permitted development?

No. Permitted development rights sit in Schedule 2 of the Town and Country Planning (General Permitted Development) (England) Order 2015. Its renewable energy part, Part 14, has classes for solar equipment, heat pumps and flues, and none for air conditioning on non-domestic premises. Online guides often say a condenser on a shop, office or warehouse wall is permitted development. The legislation, as shown on legislation.gov.uk on 22 October 2026, does not.

Part 14 classesPremisesWhat they cover
A to IDwellinghouses and blocks of flatsSolar, ground and water source heat pumps, flues, air source heat pumps (Class G), wind turbines
J to O, and OANon-domesticSolar, ground and water source heat pumps, biomass and combined heat and power flues, solar canopies

Class G, the only air source heat pump class, covers a dwellinghouse or block of flats, with a condition that the pump is not solely used for cooling. The Planning Portal says air source heat pumps on non-domestic land are likely to need a planning application, and gov.wales says the same. The page records 2026 amendments (S.I. 2026/313 from 9 April and S.I. 2026/896 from 27 August) to the solar classes and an interpretation paragraph. They do not touch Class G or add a cooling class.

Could another class cover a condenser fixed to a commercial building?

Part 7 covers non-domestic extensions and alterations. Class A deals with the extension or alteration of commercial, business or service premises, and Class H with the erection, extension or alteration of an industrial building or warehouse. Both are narrow. Class A allows alterations at ground floor level only. It does not apply to alterations on article 2(3) land (national parks, areas of outstanding natural beauty, conservation areas and similar) or to development within the curtilage of a listed building.

Whether a wall-mounted condenser counts as an alteration of that kind is a judgement for the council, and this page does not treat it as settled. Plant on a roof is not at ground floor level. A lawful development certificate is the formal way to get an answer for a specific building.

When does air conditioning work not count as development?

Section 55 of the Town and Country Planning Act 1990 treats works that "affect only the interior of the building" or "do not materially affect the external appearance of the building" as outside development. Government guidance says "materially affect" has no statutory definition but is linked to the significance of the change to a building's external appearance.

Islington Council applies that to equipment. Very small external equipment, such as a small extractor fan not visible from the surrounding streets, may not need permission if it does not materially change the external appearance. Other equipment fixed to the outside needs full planning permission. Lewisham Council says permission is needed to install, alter, replace or move air conditioning where any part is fixed to the outside of a property.

Rights can also be taken away. Planning guidance says a condition on a planning permission or an article 4 direction can remove them, so the decision notice for the building is worth reading first.

What do councils assess?

  • Noise. Brighton and Hove City Council lists air conditioning units among plant that may need an acoustic assessment in line with BS 4142, and Lewisham requires a noise and vibration impact assessment where an application generates noise. The air conditioning noise guide explains how these work.
  • Appearance. The section 55 test again: how visible the unit, grille or screen is from the street and from neighbours.
  • Heritage. In a conservation area the council must pay special attention to preserving or enhancing its character or appearance. Listed buildings add a separate consent, covered in the guide to air conditioning in listed buildings and conservation areas.
  • Need for cooling. In London, major development proposals are expected to show how they reduce reliance on air conditioning. The London Plan cooling hierarchy guide covers that policy, which applies only there.

What conditions do councils usually attach?

Planning guidance names conditions that specify permissible noise levels as one way to manage noise. The City of London's published wording for new plant is a clear example: noise must be at least 10 dBA below the existing background level, measured one metre from the window of the nearest noise-sensitive premises in line with BS 4142, and checked after installation in a report approved by the council. Other councils use different margins, and the noise guide compares two. A condition travels with the permission, so a later change of unit or position is worth checking against it.

How do Scotland, Wales and Northern Ireland differ?

Everything above is the English position. In Scotland, Planning Circular 2/2024 explains non-domestic permitted development rights. Wales gives the heat pump warning quoted earlier. In Northern Ireland, nidirect advises asking the council's planning office before starting development work. Each nation has its own order, so the relevant council is the first call.

How does this differ from air conditioning at a home?

In June 2026 the housing ministry said that for a small home planning permission is not required in most cases if the unit would not materially affect the building's appearance from outside, adding that there is no blanket rule. That is a household statement and does not carry over to commercial premises.

What should be checked before installing?

  1. Whether the building is listed, in a conservation area or covered by an article 4 direction.
  2. The conditions on any earlier planning permission for the site.
  3. Where the plant could go, how visible it would be, and how far it is from homes or other noise-sensitive uses.
  4. Whether to ask the council for pre-application advice or apply for a lawful development certificate.
  5. A planning application, where equipment is to be fixed to the outside.

Readers planning a commercial air conditioning installation can send an enquiry through the site's form. The same page explains why plant location is settled early, alongside surveys, load calculations and commissioning.

Sources

Common questions

Is there a 2.5 metre rule for commercial air conditioning units?

Not in the air conditioning or heat pump rules. The Part 14 heat pump class for homes sets a volume limit (1.5 cubic metres for a dwellinghouse), not a height test. A 2.5 metre height limit appears in Part 7, but for shop trolley stores. For a commercial condenser the test is whether the work materially affects the external appearance.

What if a unit has already been installed without permission?

Local planning authorities have discretion to take enforcement action when they regard it as expedient. They may invite a retrospective application, but planning guidance says it cannot be assumed that permission will be granted, and the application is considered in the normal way.

Does a unit that heats and cools change the answer for a commercial building?

Not in England. Class G covers a dwellinghouse or block of flats, and the Planning Portal says air source heat pumps on non-domestic land are likely to need a planning application. The council can confirm the position for a specific building.

Who decides whether a particular unit needs permission?

The local planning authority. Anyone can apply to it for a lawful development certificate, which records whether a proposed development is lawful for planning purposes. Section 192 of the 1990 Act sets out how that application works.

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