A leaseholder should normally obtain written freeholder or managing-agent consent before fixing an outdoor unit to the building, drilling through external walls, using common parts or altering shared services. Planning permission, building requirements and neighbour impact are separate checks. Tenants also need their landlord's written permission. Do not buy equipment until the lease, title, consent process and proposed route have been reviewed, because retrospective approval may be refused.
Start with the lease and title
Many leases restrict alterations to structure, external appearance, services or common parts. Even when the indoor unit sits within the flat, the external wall, roof, balcony facade or service riser may belong to or be controlled by the freeholder.
Read the alterations, nuisance, services and access clauses. A managing agent may administer the process, but the legal consent may need to come from the freeholder or another named party.
Prepare a consent package
A clear technical submission helps the decision-maker assess the proposal. Include drawings, equipment data, noise figures, pipe and condensate routes, electrical details, fixing method, maintenance access and installer certification.
The freeholder may require a formal licence to alter, professional fees, conditions on working hours or evidence of insurance. Ask for likely charges and timescales before committing to an installation date.
- Indoor and outdoor unit locations.
- Wall, roof or balcony penetrations and weather sealing.
- Condensate discharge point.
- Noise and vibration controls.
- Access plan for maintenance and eventual removal.
Planning and building controls remain separate
Freeholder approval does not establish that planning permission is unnecessary. Flats should not assume the same permitted development position as a house, and a cooling-only proposal does not satisfy the Class G condition that the heat pump must not be used solely for cooling.
Fire compartmentation, structure, electrical safety and penetrations through shared elements may require specialist input or building control consideration. The installer should not conceal routes until the relevant approvals are settled.
Neighbours, noise and drainage
Outdoor equipment near bedrooms, balconies or light wells can transmit airborne and structure-borne noise. An acoustic assessment may be proportionate in a dense block, particularly where background noise is low at night.
Condensate must not drip onto another property, stain a facade or create a slip risk. The consent should identify a durable drain route and responsibility for maintenance, leaks and making good.
Frequently asked questions
Can a leaseholder install air conditioning without consent?
That depends on the lease and property, but external fixings and penetrations commonly require consent. Proceeding first can create breach-of-lease and reinstatement risks.
Does owning a share of freehold remove the need for approval?
Not necessarily. The lease and the freehold company's decision process still apply, and other consents may remain necessary.
Can a condenser sit on a private balcony?
Possibly, but the balcony structure or external appearance may still be controlled by the lease. Airflow, noise, drainage, fire safety and planning also need checking.
Who pays the freeholder's professional fees?
The lease or consent process may allow reasonable legal, surveyor or engineer fees to be charged to the applicant. Ask for an estimate and basis before applying.
Related guides
Sources and further reading
How this guide was prepared
This guide was written by the Local AC Installers Editorial Team. We compare official guidance, legislation and established consumer information, separate general information from project-specific advice, and show publication dates and sources. We do not accept installer accreditation claims at face value.