In Runnymede, Windsor and Maidenhead, Spelthorne the average household spends £795 a year on heating — 17% lower than the UK average of £960. Typical homes are 77.0 m² with 4.3 rooms. The local population is around 26,696 residents (Census 2021). Switching to an air-source heat pump could save up to £318 a year for an average home after the £7,500 Boiler Upgrade Scheme grant.


Areas covered

Staines-upon-Thames, Egham Hythe, Laleham

See more in the TW 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 Runnymede, Windsor and Maidenhead, Spelthorne are around 15% higher than the UK average.

CategoryNational cost range Adjusted for TW18 (×1.15) Net after £7,500 BUS grant
Small flats / simple installs £ 6,000 – £ 7,000 £ 6,900 – £ 8,050 from ~£ 1,000*
2–3-bed semis / moderate upgrades £ 8,000 – £ 12,000 £ 9,200 – £ 13,800 £ 1,700 – £ 6,300
Large detached / extensive work £ 13,000 – £ 18,000 £ 14,950 – £ 20,700 £ 7,450 – £ 13,200

* 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 £4,767 for a typical 3-bedroom home after the £7,500 grant.

How much can I save on heating bills?

Roughly £318 per year for the average home at current price-cap rates.

  • £795 Average Heating Cost UK avg £960
  • 77.0 m² Median Floor Area UK avg 84.7 m²
  • 4.3 Average Rooms UK avg 4.4

Local energy snapshot

Latest tariff window: 2025Q4

Ofgem region & price cap

Southern · 26.48p/kWh · 44.62p/day

PV potential (south-facing)

998 kWh per kWp/year

Dwelling mix

House 43.9% Flat 47% Bungalow 5.5% Detached 15.3% Semi-detached 40.6% Terraced 38.6%

EPC certificates

8,450 on record

Ready to get started?

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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 ~£828/year
Payback: 12.3 years

With heat pump:

Solar saves ~£992/year
Payback: 10.3 years

  • Typical system 5 kW
  • Installation cost ~£10,200
  • Annual generation 4,990 kWh

See detailed solar data for TW18 →

Data from our sister site, Solar By Postcode UK

Compare nearby areas: TW15 (Hounslow, Spelthorne) · TW16 (Elmbridge, Spelthorne) · TW17 (Elmbridge, Spelthorne) · TW19 (Hounslow, Hillingdon, Runnymede, Windsor and Maidenhead, Spelthorne) · TW20 (Runnymede)

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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