In Welwyn Hatfield the average household spends £1,073 a year on heating — 12% higher than the UK average of £960. Typical homes are 84.0 m² with 5.2 rooms. The local population is around 13,596 residents (Census 2021). Switching to an air-source heat pump could save up to £429 a year for an average home after the £7,500 Boiler Upgrade Scheme grant.


Areas covered

Welwyn Garden City (west), Lemsford

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 Welwyn Hatfield are slightly above the UK average.

CategoryNational cost range Adjusted for AL8 (×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 £429 per year for the average home at current price-cap rates.

  • £1,073 Average Heating Cost UK avg £960
  • 84.0 m² Median Floor Area UK avg 84.7 m²
  • 5.2 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)

994 kWh per kWp/year

Dwelling mix

House 60.5% Flat 31.9% Bungalow 5.9% Detached 17.4% Semi-detached 24.4% Terraced 55.1%

EPC certificates

3,685 on record

Ready to get started?

Blue Ape Renewables will handle your free quote and £7,500 grant application

Get Free Quote & Grant Help →

MCS certified • Grant application handled • 4.8★ Trustpilot • Octopus Energy partner

Also in Your Area: Solar Panel Potential

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

Without heat pump:

Solar saves ~£826/year
Payback: 12.3 years

With heat pump:

Solar saves ~£990/year
Payback: 10.3 years

  • Typical system 5 kW
  • Installation cost ~£10,200
  • Annual generation 4,972 kWh

See detailed solar data for AL8 →

Data from our sister site, Solar By Postcode UK

Compare nearby areas: AL5 (Central Bedfordshire, St Albans) · AL6 (North Hertfordshire, St Albans, East Hertfordshire, Welwyn Hatfield) · AL7 (Welwyn Hatfield) · AL9 (East Hertfordshire, Welwyn Hatfield) · AL10 (Welwyn Hatfield)

Heat Pump Installation & Ownership Guide

Timeline, planning rules, maintenance and what to expect
Loading the guide…

Official Heat Pump Resources & Data Sources

BUS, Ofgem, planning rules, MCS and the data behind the numbers
Loading official links…