In Hillingdon, Three Rivers, Watford, Buckinghamshire the average household spends £1,123 a year on heating — 17% higher than the UK average of £960. Typical homes are 88.0 m² with 5.0 rooms. The local population is around 43,007 residents (Census 2021). Switching to an air-source heat pump could save up to £449 a year for an average home after the £7,500 Boiler Upgrade Scheme grant.
Areas covered
Rickmansworth, Chorleywood, Croxley Green, Loudwater, Mill End, Maple Cross, Sarratt, Batchworth, Chenies, Harefield, (part), West Hyde, Heronsgate, Chandler's Cross
See more in the WD 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, Watford, Buckinghamshire are slightly above the UK average.
| Category | National cost range | Adjusted for WD3 (×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 |
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|---|---|
| Mid end |
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| Upper end |
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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 £449 per year for the average home at current price-cap rates.
- £1,123 Average Heating Cost UK avg £960
- 88.0 m² Median Floor Area UK avg 84.7 m²
- 5.0 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)
992 kWh per kWp/year
Dwelling mix
EPC certificates
9,905 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.
Solar saves ~£989/year
Payback: 12.3 years
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 WD3 →
Data from our sister site, Solar By Postcode UK
Compare nearby areas: WD4 (Three Rivers, Dacorum, Watford) · WD5 (Three Rivers, St Albans, Watford) · WD6 (Hertsmere, Barnet)
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
Official Heat Pump Resources & Data Sources
BUS, Ofgem, planning rules, MCS and the data behind the numbers