In Wiltshire the average household spends £1,087 a year on heating — 13% higher than the UK average of £960. Typical homes are 113.0 m² with 5.1 rooms. The local population is around 24,803 residents (Census 2021). Switching to an air-source heat pump could save up to £435 a year for an average home after the £7,500 Boiler Upgrade Scheme grant.


Areas covered

Calne, Heddington, Hilmarton

See more in the SN 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 Wiltshire are around 10% higher than the UK average.

CategoryNational cost range Adjusted for SN11 (×1.10) Net after £7,500 BUS grant
Small flats / simple installs £ 6,000 – £ 7,000 £ 6,600 – £ 7,700 from ~£ 1,000*
2–3-bed semis / moderate upgrades £ 8,000 – £ 12,000 £ 8,800 – £ 13,200 £ 1,300 – £ 5,700
Large detached / extensive work £ 13,000 – £ 18,000 £ 14,300 – £ 19,800 £ 6,800 – £ 12,300

* 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 £4,233 for a typical 3-bedroom home after the £7,500 grant.

How much can I save on heating bills?

Roughly £435 per year for the average home at current price-cap rates.

  • £1,087 Average Heating Cost UK avg £960
  • 113.0 m² Median Floor Area UK avg 84.7 m²
  • 5.1 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)

988 kWh per kWp/year

Dwelling mix

House 76.5% Flat 13.7% Bungalow 9.1% Detached 30.7% Semi-detached 32.4% Terraced 35.5%

EPC certificates

7,127 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 ~£820/year
Payback: 12.4 years

With heat pump:

Solar saves ~£983/year
Payback: 10.4 years

  • Typical system 5 kW
  • Installation cost ~£10,200
  • Annual generation 4,941 kWh

See detailed solar data for SN11 →

Data from our sister site, Solar By Postcode UK

Compare nearby areas: SN8 (Wiltshire, Swindon, West Berkshire) · SN9 (Wiltshire) · SN10 (Wiltshire) · SN12 (Wiltshire) · SN13 (Wiltshire) · SN14 (Wiltshire, South Gloucestershire)

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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