In Wealden, Lewes, Horsham, Mid Sussex the average household spends £1,308 a year on heating — 36% higher than the UK average of £960. Typical homes are 116.0 m² with 5.2 rooms. The local population is around 20,487 residents (Census 2021). Switching to an air-source heat pump could save up to £523 a year for an average home after the £7,500 Boiler Upgrade Scheme grant.


Areas covered

Ansty, Ardingly, Balcombe, Bolney, Chelwood Gate, Cuckfield, Danehill, Handcross, Hickstead, Horsted Keynes, Wivelsfield, Wivelsfield Green

See more in the RH 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 Wealden, Lewes, Horsham, Mid Sussex are around 15% higher than the UK average.

CategoryNational cost range Adjusted for RH17 (×1.15) Net after £7,500 BUS grant
Small flats / simple installs £ 6,000 – £ 7,000 £ 6,900 – £ 8,050 from ~£ 1,000*
2–3-bed semis / moderate upgrades £ 8,000 – £ 12,000 £ 9,200 – £ 13,800 £ 1,700 – £ 6,300
Large detached / extensive work £ 13,000 – £ 18,000 £ 14,950 – £ 20,700 £ 7,450 – £ 13,200

* 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 £4,767 for a typical 3-bedroom home after the £7,500 grant.

How much can I save on heating bills?

Roughly £523 per year for the average home at current price-cap rates.

  • £1,308 Average Heating Cost UK avg £960
  • 116.0 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

South East · 26.92p/kWh · 47.60p/day

PV potential (south-facing)

1,033 kWh per kWp/year

Dwelling mix

House 75.3% Flat 14.1% Bungalow 9.6% Detached 48.4% Semi-detached 30.9% Terraced 19.1%

EPC certificates

5,384 on record

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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 ~£1,039/year
Payback: 11.7 years

With heat pump:

Solar saves ~£1,249/year
Payback: 9.8 years

  • Typical system 6 kW
  • Installation cost ~£12,200
  • Annual generation 6,198 kWh

See detailed solar data for RH17 →

Data from our sister site, Solar By Postcode UK

Compare nearby areas: RH14 (Waverley, Horsham, Chichester) · RH15 (Lewes, Mid Sussex) · RH16 (Lewes, Mid Sussex) · RH18 (Wealden, Mid Sussex) · RH19 (Wealden, Tandridge, Mid Sussex) · RH20 (Horsham, Chichester)

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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