In Hillingdon, Three Rivers, Harrow the average household spends £1,033 a year on heating — 8% higher than the UK average of £960. Typical homes are 89.0 m² with 4.4 rooms. The local population is around 47,084 residents (Census 2021). Switching to an air-source heat pump could save up to £413 a year for an average home after the £7,500 Boiler Upgrade Scheme grant.


Areas covered

Pinner, Eastcote (north and east), Hatch End, Rayners Lane, (north), Carpenders Park, (part)

See more in the HA 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 Hillingdon, Three Rivers, Harrow are slightly above the UK average.

CategoryNational cost range Adjusted for HA5 (×1.05) Net after £7,500 BUS grant
Small flats / simple installs £ 6,000 – £ 7,000 £ 6,300 – £ 7,350 from ~£ 1,000*
2–3-bed semis / moderate upgrades £ 8,000 – £ 12,000 £ 8,400 – £ 12,600 from ~£ 1,000*
Large detached / extensive work £ 13,000 – £ 18,000 £ 13,650 – £ 18,900 £ 6,150 – £ 11,400

* 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 £3,700 for a typical 3-bedroom home after the £7,500 grant.

How much can I save on heating bills?

Roughly £413 per year for the average home at current price-cap rates.

  • £1,033 Average Heating Cost UK avg £960
  • 89.0 m² Median Floor Area UK avg 84.7 m²
  • 4.4 Average Rooms UK avg 4.4

Local energy snapshot

Latest tariff window: 2025Q4

Ofgem region & price cap

Eastern · 26.53p/kWh · 48.25p/day

PV potential (south-facing)

993 kWh per kWp/year

Dwelling mix

House 51.6% Flat 33.6% Bungalow 7.5% Detached 25.3% Semi-detached 40.2% Terraced 30.4%

EPC certificates

10,131 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 ~£989/year
Payback: 12.3 years

With heat pump:

Solar saves ~£1,186/year
Payback: 10.3 years

  • Typical system 6 kW
  • Installation cost ~£12,200
  • Annual generation 5,955 kWh

See detailed solar data for HA5 →

Data from our sister site, Solar By Postcode UK

Compare nearby areas: HA2 (Harrow) · HA3 (Brent, Harrow) · HA4 (Hillingdon, Harrow) · HA6 (Hillingdon, Three Rivers) · HA7 (Hertsmere, Barnet, Brent, Harrow) · HA8 (Barnet, Brent, Harrow)

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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