In Lambeth the average household spends £564 a year on heating — 41% lower than the UK average of £960. Typical homes are 67.0 m² with 3.4 rooms. The local population is around 48,003 residents (Census 2021). Switching to an air-source heat pump could save up to £226 a year for an average home after the £7,500 Boiler Upgrade Scheme grant.


Areas covered

Stockwell district:, Brixton, Stockwell, Clapham, (part), Oval, (part)

See more in the SW area hub.

Typical air-source heat-pump installation costs range from about £6,000 at the low end to roughly £18,000 at the high end. Most homes fall somewhere between £7,000 and £15,000. These prices are before the £7,500 BUS grant (in addition, qualifying rural and island homes in Scotland may receive a further £1,500 uplift under the Home Energy Scotland scheme, for up to £9 000 of grant funding).

Installation costs in Lambeth are around 20% higher than the UK average.

CategoryNational cost range Adjusted for SW9 (×1.20) Net after £7,500 BUS grant
Small flats / simple installs £ 6,000 – £ 7,000 £ 7,200 – £ 8,400 from ~£ 1,000*
2–3-bed semis / moderate upgrades £ 8,000 – £ 12,000 £ 9,600 – £ 14,400 £ 2,100 – £ 6,900
Large detached / extensive work £ 13,000 – £ 18,000 £ 15,600 – £ 21,600 £ 8,100 – £ 14,100

* Minimum net costs rarely fall below £1,000 after grant, since most installs incur at least minor extra work.

Lower end
  • Minimal groundwork or plumbing modification required
  • Well-insulated homes that only need a compact ASHP unit
Mid end
  • Moderate radiator or underfloor-heating upgrades
  • Typical pump size (8–12 kW)
Upper end
  • Large detached houses or older properties needing major pipework
  • Extensive insulation or radiator replacement
  • Multi-zone controls and bespoke system design

Heat pump FAQs

How much does a heat pump cost here?

About £5,300 for a typical 3-bedroom home after the £7,500 grant.

How much can I save on heating bills?

Roughly £226 per year for the average home at current price-cap rates.

  • £564 Average Heating Cost UK avg £960
  • 67.0 m² Median Floor Area UK avg 84.7 m²
  • 3.4 Average Rooms UK avg 4.4

Local energy snapshot

Latest tariff window: 2025Q4

Ofgem region & price cap

London · 25.63p/kWh · 46.06p/day

PV potential (south-facing)

991 kWh per kWp/year

Dwelling mix

House 12.4% Flat 73.5% Bungalow 0.5% Detached 7.5% Semi-detached 8.7% Terraced 75.2%

EPC certificates

16,223 on record

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Also in Your Area: Solar Panel Potential

Heat pumps increase electricity usage. Solar panels can offset your higher bills.

Without heat pump:

Solar saves ~£805/year
Payback: 12.7 years

With heat pump:

Solar saves ~£960/year
Payback: 10.6 years

  • Typical system 5 kW
  • Installation cost ~£10,200
  • Annual generation 4,953 kWh

See detailed solar data for SW9 →

Data from our sister site, Solar By Postcode UK

Compare nearby areas: SW6 (Hammersmith and Fulham) · SW7 (Westminster, Kensington and Chelsea) · SW8 (Wandsworth, Lambeth) · SW10 (Hammersmith and Fulham, Kensington and Chelsea) · SW11 (Wandsworth) · SW12 (Wandsworth, Lambeth)

Heat Pump Installation & Ownership Guide

Timeline, planning rules, maintenance and what to expect
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Official Heat Pump Resources & Data Sources

BUS, Ofgem, planning rules, MCS and the data behind the numbers
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