Permission to install air conditioning in Europe: who has to say yes

Updated August 24, 2026 · Claude AC · 2 sources cited

Contents (7)

The three consents behind one outdoor unit
Where the line falls, country by country
The condominium vote is the real obstacle
Heritage zones are where projects die
Installing anyway: what it actually costs
Routes that avoid the permission problem
Frequently asked questions

Two questions get confused every time a European household decides to hang a split system on a wall, and confusing them is how installations end up being removed at the owner’s expense. The first is public law: does the municipality or the planning authority have to approve a machine bolted to a façade? The second is private law: does the building — the condominium, the freeholder, the landlord — get a vote? Different people decide them, under different rules, on different timescales. A yes from one is worth nothing without a yes from the other, and the second one is refused far more often than the first.

The three consents behind one outdoor unit

Planning or building consent. An outdoor unit changes the external appearance of a building, which is what planning law exists to regulate. Most European countries exempt small domestic units under some threshold — size, position, visibility from the street — and require a declaration or a permit above it.
Co-ownership or landlord consent. In a flat, the façade, the roof, the courtyard and often the balcony parapet are collective property. Fixing anything to them needs the building’s agreement, usually a vote at a general meeting, whatever the planning rules say.
Installer certification. Not a permission you apply for, but a legal condition on the work: across the EU, opening a refrigerant circuit is restricted to F-gas certified personnel under Regulation (EU) 2024/573. An uncertified installation is unlawful even where nobody needed to approve the unit.

Where the line falls, country by country

The table below summarises the shape of each regime rather than the letter of it — thresholds change, and municipal rules sit on top of national ones almost everywhere. Verify with your own mairie, ayuntamiento, comune, Bauamt or council before ordering equipment.

Country	Planning side	What usually decides it
United Kingdom (England)	Permitted development for most domestic units since the May 2025 amendment order	Up to 1.5 m³ on a house (0.6 m³ on a flat), one unit — two on a detached house, never on a pitched roof or a listed building, and compliance with the MCS 020a planning standard. A cooling-only system still needs a planning application; a reversible one does not.
France	Déclaration préalable at the town hall when the unit alters the external appearance	Article R.421-17 of the code de l’urbanisme; one month of instruction, two in protected sectors. In a copropriété, a general-meeting vote is required on top, and it is the harder of the two.
Spain	Municipal — typically a comunicación previa or a minor-works licence	Rules are set by each ayuntamiento, with stricter regimes in historic centres. The Ley de Propiedad Horizontal makes the community of owners the gatekeeper for anything fixed to a common element.
Italy	Generally free building activity for a domestic split	Municipal regulations, landscape constraints and, in a condominio, the decoro architettonico rules of the civil code routinely dictate where the unit may go — courtyard side rather than street side is the standard outcome.
Germany	Usually exempt from a building permit for small units, by Land	The real constraints are noise under TA Lärm and, in an owners’ association, the post-2020 WEG rules that make an outdoor unit a structural alteration requiring a resolution.
Switzerland	Among the strictest in Europe — cantonal permit regimes	Several cantons require an authorisation for comfort cooling and can refuse it on energy-policy grounds. This is a large part of why Swiss household AC ownership stays low.
Netherlands, Belgium, Nordics	Small units on private property are commonly permit-free	Municipal noise ordinances and, for flats, the owners’ association do the real filtering. Heritage zones remain the exception.

The condominium vote is the real obstacle

Across the continent, planning departments say yes far more often than buildings do. The pattern repeats with local vocabulary: an outdoor unit fixed to a shared façade is a private appropriation of common property, and it needs a collective decision — a qualified majority in a French assemblée générale, an agreement of the comunidad de propietarios in Spain, a resolution of the Eigentümerversammlung in Germany, a condominio decision in Italy.

What actually moves a vote, in order of effectiveness: a position invisible from the street, an acoustic report showing night-time levels at the nearest window, an undertaking to remove the unit and make good at your own cost when you sell, an offer to route the condensate into an existing drain rather than onto the courtyard, and — the underrated one — going first, before three neighbours have installed units badly and hardened the building against the whole idea. Our guide to AC noise rules in Europe covers the decibel arguments that carry weight in these meetings.

Tenants have a narrower path. Almost everywhere, a fixed installation requires the landlord’s written agreement, and the landlord in a block still needs the building’s. A written agreement should say who owns the equipment at the end of the lease, who maintains it, and whether the tenant must restore the wall.

Heritage zones are where projects die

Listed buildings, conservation areas, protected perimeters around monuments and Mediterranean historic centres apply a different logic: not « is it noisy » but « is it visible ». Expect a heritage officer to require a courtyard or roof-recessed position, a screen matched to the façade, or in the hardest cases to refuse an external unit outright. In England, permitted development does not apply to listed buildings at all. In France, the architecte des Bâtiments de France can impose a non-visible location, which sometimes means the only viable machine is a fixed monobloc with discreet grilles rather than a split.

Installing anyway: what it actually costs

Enforcement in Europe is complaint-driven, which lulls people into treating consent as optional. The bill arrives later. A neighbour’s complaint can trigger a removal order years after installation. A condominium can obtain restoration of the façade at the owner’s expense. And the most common sting is at sale: conveyancing checks in several countries surface undeclared façade works, and buyers use them to renegotiate. Retrofitting consent after the fact is possible almost everywhere, but it is slower, and the building now has a reason to say no.

Routes that avoid the permission problem

A portable unit needs nobody’s approval — no façade work, no fixing, no planning act. It pays for that freedom in efficiency and noise, as our portable versus split comparison sets out in detail.
A fixed monobloc puts the whole machine indoors and needs only two small grilles. Discreet, but still a modification of the façade — it usually needs the same consents, granted more readily.
A floor-standing outdoor unit on a private terrace or garden, not fixed to a common element and not visible from the street, is the position most likely to pass both filters at once.
A reversible unit rather than a cooling-only one is now a genuine regulatory advantage in England, and in several countries it opens heating-renovation support schemes that pure AC never qualifies for.

Sequence the project accordingly: settle the position and the consents first, then take quotes for that position. Three quotes for three different positions compare nothing, and the price consequences of a difficult location are large — the access and routing surcharges are itemised in our guide to installation costs in Europe.

Frequently asked questions

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

In England, most domestic installations have been permitted development since the May 2025 amendment, provided the outdoor unit stays within 1.5 m³ on a house (0.6 m³ on a flat), respects the position and quantity limits, and meets the MCS 020a planning standard. Two exceptions matter: a cooling-only system still requires a planning application, and listed buildings are excluded entirely. Scotland, Wales and Northern Ireland run their own rules.

Can my neighbours stop me installing an air conditioner?

Directly, if you share a building: co-owners vote on anything fixed to common property, and that vote is binding. Indirectly, if you do not: a compliant installation can still be attacked as a nuisance if the received noise at their windows is excessive at night, and European courts do order relocation.

How long does the paperwork take?

Roughly a month for a French déclaration préalable, two in a protected sector; similar for municipal minor-works procedures elsewhere. The condominium calendar is the real delay — many buildings hold one general meeting a year, so a missed agenda deadline can cost a whole summer.

Does a portable air conditioner need any permission?

No. It is an appliance, not building work. The only limits that apply are the ordinary ones on noise and on hanging a hose out of a window in some managed buildings.

Can a landlord refuse air conditioning outright?

For a fixed installation, generally yes — it is a modification of their property, and in a block they may not even be free to agree. Portable equipment is normally a different matter, since it alters nothing. Get any agreement in writing, including what happens at the end of the tenancy.