In Hertsmere, North Hertfordshire, St Albans, Welwyn Hatfield the average household spends £998 a year on heating — 4% higher than the UK average of £960. Typical homes are 78.0 m² with 4.5 rooms. The local population is around 28,432 residents (Census 2021). Switching to an air-source heat pump could save up to £399 a year for an average home after the £7,500 Boiler Upgrade Scheme grant.
Areas covered
St Albans (east), Blackmore End, Colney Heath, Jersey Farm, Marshalswick, Oaklands, Sandridge, Smallford, Tyttenhanger, Wheathampstead
See more in the AL 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 Hertsmere, North Hertfordshire, St Albans, Welwyn Hatfield are slightly above the UK average.
| Category | National cost range | Adjusted for AL4 (×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 £399 per year for the average home at current price-cap rates.
- £998 Average Heating Cost UK avg £960
- 78.0 m² Median Floor Area UK avg 84.7 m²
- 4.5 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
6,899 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 ~£824/year
Payback: 12.4 years
Solar saves ~£988/year
Payback: 10.3 years
- Typical system 5 kW
- Installation cost ~£10,200
- Annual generation 4,962 kWh
See detailed solar data for AL4 →
Data from our sister site, Solar By Postcode UK
Compare nearby areas: AL1 (St Albans) · AL2 (Hertsmere, St Albans) · AL3 (Central Bedfordshire, St Albans, Dacorum) · AL5 (Central Bedfordshire, St Albans) · AL6 (North Hertfordshire, St Albans, East Hertfordshire, Welwyn Hatfield) · AL7 (Welwyn Hatfield)
Heat Pump Installation & Ownership Guide
Timeline, planning rules, maintenance and what to expect
Heat Pump Installation & Ownership Guide
Timeline, planning rules, maintenance and what to expect
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