In Sutton, Merton the average household spends £655 a year on heating — 32% lower than the UK average of £960. Typical homes are 67.0 m² with 3.8 rooms. The local population is around 39,689 residents (Census 2021). Switching to an air-source heat pump could save up to £262 a year for an average home after the £7,500 Boiler Upgrade Scheme grant.
Areas covered
Morden, Morden Park, Lower Morden, Cannon Hill, St. Helier (North), Rosehill
See more in the SM 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 Sutton, Merton are around 20% higher than the UK average.
| Category | National cost range | Adjusted for SM4 (×1.20) | Net after £7,500 BUS grant |
|---|---|---|---|
| Small flats / simple installs | £ 6,000 – £ 7,000 | £ 7,200 – £ 8,400 | from ~£ 1,000* |
| 2–3-bed semis / moderate upgrades | £ 8,000 – £ 12,000 | £ 9,600 – £ 14,400 | £ 2,100 – £ 6,900 |
| Large detached / extensive work | £ 13,000 – £ 18,000 | £ 15,600 – £ 21,600 | £ 8,100 – £ 14,100 |
* 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 £5,300 for a typical 3-bedroom home after the £7,500 grant.
How much can I save on heating bills?
Roughly £262 per year for the average home at current price-cap rates.
- £655 Average Heating Cost UK avg £960
- 67.0 m² Median Floor Area UK avg 84.7 m²
- 3.8 Average Rooms UK avg 4.4
Local energy snapshot
Latest tariff window: 2025Q4
Ofgem region & price cap
London · 25.63p/kWh · 46.06p/day
PV potential (south-facing)
999 kWh per kWp/year
Dwelling mix
EPC certificates
7,739 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.
Solar saves ~£649/year
Payback: 12.5 years
Solar saves ~£774/year
Payback: 10.5 years
- Typical system 4 kW
- Installation cost ~£8,100
- Annual generation 3,994 kWh
See detailed solar data for SM4 →
Data from our sister site, Solar By Postcode UK
Compare nearby areas: SM1 (Sutton) · SM2 (Reigate and Banstead, Epsom and Ewell, Sutton) · SM3 (Epsom and Ewell, Sutton, Merton) · SM5 (Reigate and Banstead, Sutton) · SM6 (Sutton) · SM7 (Reigate and Banstead, Sutton)
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