Heat Pump Installation in London — 2026
London has the UK's largest MCS installer pool (320+) but also the highest labour costs. Average installation £14,500 — £7,000 after the £7,500 BUS grant. Plus borough-level grants, planning quirks, and conservation area rules.
London heat pump cost — what to expect
| Property type | Pump size | Installed cost | Net after BUS |
|---|---|---|---|
| 1-bed flat (40-55 m²) | 4-5 kW | £10,500-£12,500 | £3,000-£5,000 |
| 2-bed terrace (70 m²) | 6-7 kW | £12,500-£14,500 | £5,000-£7,000 |
| 3-bed semi (95 m²) | 8-10 kW | £14,000-£17,000 | £6,500-£9,500 |
| 4-bed detached (140 m²) | 11-14 kW | £17,000-£21,500 | £9,500-£14,000 |
| 5+ bed period property | 14-20 kW | £20,000-£35,000 | £12,500-£27,500 |
Cost by London borough
Within London, prices vary by ~£2,000 between cheapest and most expensive boroughs. Drivers: parking restrictions, conservation areas, average property size, and Victorian solid-wall stock.
| Borough | Avg cost (8 kW ASHP) | Key factor |
|---|---|---|
| Kensington & Chelsea | £17,500 | Period stock, conservation areas, parking |
| Westminster | £17,000 | Listed buildings, planning complexity |
| Hampstead, Highgate | £16,500 | Solid-wall Victorian + conservation |
| Camden, Islington | £15,500 | Conservation areas in pockets |
| Hackney, Tower Hamlets | £14,000 | Modern flats easier; older terraces harder |
| Wandsworth, Lambeth | £14,500 | Mix of stock |
| Greenwich, Lewisham | £13,500 | Suburban semis, easier access |
| Outer London (Croydon, Bromley, Enfield) | £13,000 | Suburban, easier installs |
| Hillingdon, Hounslow, Havering | £12,500 | Newer stock, easier access |
London-specific things to know
Planning permission in conservation areas
About 40% of London properties are in an Article 4 conservation area where the standard "permitted development" rules for heat pumps don't apply. You need full planning permission (~£250 fee + 8 weeks). Boroughs most affected: K&C, Westminster, Camden, Islington, Camden, Hackney, Wandsworth.
Listed buildings
London has the UK's largest stock of Grade I and II listed buildings. Heat pumps in listed properties need Listed Building Consent (separate from planning permission). Allow 12-16 weeks for both decisions. Internal positioning often used to satisfy planners.
The 1-metre rule (now removed)
Until May 2025, heat pumps had to be 1m+ from any property boundary. This rule was scrapped — heat pumps can now be installed against fences and walls under permitted development. London terraced houses benefit hugely from this change.
Parking suspension & scaffolding fees
Inner London installers often need parking suspension (£60-£200/day per bay) and scaffolding for upper-floor pipework. These add £500-£1,500 to total cost on top of the headline quote.
GLA & borough top-up grants
- Greater London Authority (GLA) — currently piloting £1,000-£1,500 heat pump top-ups in select boroughs
- Camden — Renewable Energy Grant (£500-£1,500 for verified installs)
- Islington — Green Homes Grant Plus (up to £2,000)
- Hackney — Hackney Green Communities Fund
- Lambeth — Lambeth Zero scheme (heat pump + insulation packages)
How many MCS installers operate in London?
As of May 2026, the MCS database lists 320+ certified installers operating in Greater London, the highest density in the UK. Caveat: maybe 50-60 actually do high volumes; the rest are smaller firms. For quotes, prioritise installers who have done 100+ installs in the past 24 months.
How to find a good London heat pump installer
- Search mcscertified.com for MCS firms in your postcode
- Filter by installation volume (ask: "how many heat pumps did you commission in 2025?")
- Get 3 quotes — never sign with the first
- Check Trustpilot + Google reviews (look for 4.5+ stars, 50+ reviews)
- Confirm they handle BUS submission for you
- Ask for references in your specific borough (planning experience matters)