Flat install eligibility checklist
Step 1: Check your existing heating. Individual combi boiler in your flat = installable. Communal heating system (heat-interface unit in your flat connected to central plant) = NOT individually installable.
Step 2: Check your lease. Most modern leases require freeholder written consent for any external alteration.
Step 3: Check freeholder policy. Some freeholders (Rendall & Rittner, Trinity Estates, Mainstay) have established policies for heat pumps; others require new precedent.
Step 4: Check planning. Most flats are under permitted development since 2024; conservation areas + listed buildings are exceptions.
Step 5: Check outdoor unit space. Balcony, external wall, or roof (with consent). Sound + visibility considerations.
Outdoor unit placement options
Balcony mount: most common for modern apartments. 5 kW slim units fit comfortably. Acoustic considerations — must comply with MCS 020 (42 dB at neighbour's window).
Shared external wall: requires explicit freeholder consent + neighbouring flat consent (often).
Flat roof / building rooftop: works for top-floor flats but requires roof access agreements with freeholder.
Light well / shared courtyard: sometimes possible with full freeholder + neighbour consent. Sound bounces in confined spaces.
Internal plant rooms: very rare in UK residential flats but technically possible.
Leasehold consent process
Submit a formal alteration request to the freeholder (or managing agent).
Include: heat pump specification, outdoor unit placement plans, acoustic statement, installer credentials.
Pay consent fee (typically £100–£500).
Wait 4–8 weeks for decision.
Some freeholders charge an annual 'alteration retention' fee.
Some require professional indemnity insurance documentation from the installer.
FAQ
Can I install a heat pump if my building has communal heating?
Generally no. Communal heating systems (one central boiler/biomass plant serving all flats via heat-interface units) cannot be individually replaced with heat pumps without coordinating across all flats. Speak to your freeholder/management about whole-building decarbonisation plans.
Will my freeholder definitely say no?
Modern freeholders are increasingly heat-pump-friendly because of regulatory direction (rental EPC requirements, net-zero targets). Smaller traditional freeholders may take longer. Submitting a proper alteration request with proper specifications typically gets approval, though consent fees apply.
Why is flat installation cheaper than house installation?
Smaller heat-pump capacity (3–5 kW vs 8–14 kW), modern plumbing, minimal radiator upgrades, and fewer pipe runs. Flat installs are the cheapest UK heat-pump retrofit type.
Does the BUS grant apply to flats?
Yes — £7,500 BUS grant applies to flats meeting standard eligibility (owner-occupier or private landlord, replacing fossil-fuel system, valid EPC). Communal-system flats are excluded because the heat pump must replace 100% of the flat's heating, which isn't possible without whole-building coordination.
Sources
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