Answer first
Ground-floor flats with suitable private outdoor space are often the simplest. Upper flats may need agreement for common walls, roofs or ground, a compliant sound position and a safe route for pipework and maintenance.
Do not order equipment from floor area alone. Confirm title and permissions, calculate heat loss, identify cylinder or hot-water strategy, complete the MCS sound assessment and ask the planning authority where permitted-development conditions are uncertain.
Scottish domestic permitted-development rights limit an installation to one ASHP on or within the curtilage
View sourceCurrent MCS 020 calculated sound limit at assessment positions
View sourceTitle, common ownership and siting determine practical permission
View sourceAsk FLO to assess a flat before you make assumptions
Tell FLO about the property, current heating and the point you need resolved. A £0 home survey can turn the general answer into a room-by-room design and written quote.
Resolve ownership before design goes too far
A wall, roof, garden or access route can be common property even when it looks attached to one flat. Check title documents and obtain the necessary owner, factor or landlord agreement.
Planning permission does not replace private consent, and private consent does not replace planning. Both need to be resolved where applicable.
Find a serviceable, quiet outdoor position
The unit needs airflow, drainage, maintenance access and a short practical route to indoor equipment. Balconies and roofs require structural, vibration and safe-access checks.
The MCS sound calculation considers the declared sound power, distance, reflective surfaces, barriers and assessment positions. Dense flats can have several sensitive windows, so early siting work matters.
Plan hot water and internal space
A flat with a combi boiler may not have a cylinder cupboard. Options depend on demand, electrical capacity, layout and the heat-pump type; a standard outdoor-unit assumption may not fit.
Radiators and pipework are still designed room by room. Compact homes can have modest heat loads but awkward distribution routes, so low load does not mean zero design work.
Consider the building as well as the flat
Shared fabric, stairwells, unheated neighbours and common repair plans can affect heat loss and installation sequencing. A communal system may sometimes be more appropriate, but that is a different project with ownership and metering questions.
Where an air-to-water solution is impractical, ask for an honest explanation and consider alternatives rather than forcing an unsuitable unit onto a façade or balcony.
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Questions people also ask
Do flats automatically need planning permission?+
Not always, but Scottish permitted-development limits, conservation status, listed-building status, siting and MCS 020 compliance must all be checked.
Can I put a heat pump on a balcony?+
Only after checking ownership, structure, airflow, drainage, vibration, sound, maintenance access and relevant permissions.
Can a flat get Home Energy Scotland funding?+
Eligibility depends on the applicant, property and current scheme rules; technical suitability and permissions still need evidence.
Evidence used for this answer
Figures are explained in context and links go to the independent source. Prices, tariffs, scheme rules and standards can change, so check the source again before making a financial or technical decision.
- Scottish Government: householder permitted development rightsOfficial Scottish limits and conditions for domestic air-source heat pumps, including siting, designated places and MCS 020.
- MCS 020: air-source heat-pump sound calculation standardCurrent permitted-development sound assessment method for air-source heat-pump installations.
- MCS heat-pump design standardTechnical requirements for heat loss, equipment selection, domestic hot water and system design.
- Home Energy Scotland Grant and Loan: terms and eligible costsCurrent Scottish grant and loan limits, eligible heat-pump costs, application conditions and rural uplift rules.