How Much Does a Heat Pump Cost in London? (2026 Price Guide)

Air Source Heat Pump Costs in London

An air source heat pump (ASHP) is the most common choice for London homes. It extracts heat from outside air and delivers it through your radiators or underfloor heating, even at temperatures well below zero.

• Typical installation cost: £8,000 – £14,000
• After BUS grant (£7,500): £500 – £6,500
• After BUS + 0% VAT: same as above (VAT is already zero)

The range reflects differences in property size, system complexity and whether additional work such as radiator upgrades or a new hot water cylinder is needed. A straightforward swap in a well-insulated three-bedroom home sits towards the lower end; larger properties requiring extensive emitter upgrades sit towards the upper end.

Ground Source Heat Pump Costs in London

Ground source heat pumps (GSHPs) extract heat from the ground via buried pipes. They are more efficient than ASHPs but significantly more expensive due to the groundwork involved.

• Typical installation cost: £15,000 – £30,000
• After BUS grant (£7,500): £7,500 – £22,500

GSHPs suit properties with sufficient garden space for horizontal trenches or borehole access. In London, where garden space is limited, ASHPs are far more common. However, for larger detached properties in outer London or the Home Counties, a GSHP can deliver superior efficiency and lower running costs over the long term.

What Affects the Price?

Several factors influence the final cost of a heat pump installation in London:

• Property size and heat loss: Larger homes with higher heat demand require bigger (more expensive) heat pumps and potentially more emitters.
• Existing heating system: If you currently have a combi boiler with no hot water cylinder, you'll need one installed for a heat pump — adding £1,000–£2,000 to the cost.
• Radiator upgrades: Heat pumps run at lower flow temperatures (35–55°C vs 60–80°C for gas boilers). Existing radiators may be undersized. Budget £1,500 – £4,000 for a full upgrade if needed.
• Hot water cylinder: Most heat pump systems require an unvented hot water cylinder. If you don't already have one, factor in £1,000–£2,000.
• Electrical supply: Some installations require an upgraded consumer unit or dedicated circuit, adding £300–£800.
• Insulation level: Poorly insulated homes may need fabric improvements before a heat pump can work efficiently. We recommend addressing insulation first.
• Water treatment: In hard-water areas like London, a scale inhibitor or water softener protects the heat exchanger. See our water treatment guide for details.

The Boiler Upgrade Scheme: £7,500 Off Your Installation

The Boiler Upgrade Scheme (BUS) is the government's flagship grant for heat pump adoption. Here's what you need to know:

• Standard grant: £7,500 for both air source and ground source heat pumps
• Off-gas uplift: £9,000 for homes currently heated by oil or LPG (until 31 March 2027)
• No income test: Every homeowner in England and Wales is eligible regardless of income
• Paid at source: Your our MCS-certified partner claims the grant and deducts it from your invoice — you never handle the money or the paperwork

For a detailed breakdown of all available grants, read our grants and funding guide.

0% VAT Until 31 March 2027

Energy-saving materials, including heat pumps, solar panels, batteries, insulation and heating controls, currently attract 0% VAT. This temporary relief ends on 31 March 2027, when the rate reverts to 5%.

On a £12,000 ASHP installation, that's the difference between paying £0 and £600 in VAT. Combined with the BUS grant, the window between now and March 2027 represents the maximum financial benefit available.

Read our full 0% VAT deadline guide for worked examples and timeline advice.

Warm Homes Loan: Spread the Cost from £55/Month

The Warm Homes Loan Scheme (WHLS), live since 27 October 2026, offers no- and low-interest loans for energy upgrades:

• Air source heat pump loans up to £20,000
• Ground source heat pump loans up to £35,000
• No income thresholds — available to most homeowners
• Repayment terms up to 30 years with some lenders

Worked example: Your ASHP quote is £12,000. The BUS grant of £7,500 is deducted at source, leaving £4,500 to finance. Through the Warm Homes Loan at no/low interest over ten years, your monthly repayment works out at approximately £55 a month — often less than the annual saving on your heating bills.

See our finance options page for more detail on loan products and eligibility.

Running Costs: Heat Pump vs Gas Boiler

A well-designed heat pump delivers around three units of heat for every unit of electricity consumed (a coefficient of performance, or COP, of 3+). This means running costs are typically lower than a gas boiler, even at current electricity prices.

• Gas boiler annual running cost (typical 3-bed London home): £900–£1,400
• Heat pump annual running cost (same home, standard tariff): £700–£1,100
• Heat pump with time-of-use tariff: £500–£900
• Typical annual saving: £200 – £500 versus an older gas boiler

Savings are significantly higher for homes replacing oil, LPG or electric storage heaters, where annual savings can exceed £800–£1,200.

Payback Period Calculation

With the BUS grant and 0% VAT, the net cost of an ASHP in London can be as low as £500–£6,500. At annual savings of £200–£500 versus a gas boiler, the payback period ranges from:

• Best case (off-gas, high savings, low net cost): 1–3 years
• Typical case (on-gas, moderate savings): 7–12 years
• Conservative case (higher net cost, lower savings): 12–20 years

Heat pumps also add value to your property, reduce carbon emissions and future-proof your home against rising gas prices and eventual gas boiler phase-out.

When a Heat Pump Isn't Suitable

Heat pumps are not the right solution for every property. Consider alternatives if:

• Poor insulation: If your home has uninsulated solid walls, single glazing or significant draughts, invest in fabric improvements first. A heat pump in a leaky home will struggle to maintain comfort and will cost more to run.
• Listed building constraints: Grade I and II listed buildings may face planning restrictions on external units. Internal solutions exist but are more complex and expensive. Consult your conservation officer early.
• No external space: Flats without balcony or external wall space may not accommodate an ASHP outdoor unit. Communal ground source systems or district heating may be alternatives.
• Very high temperature requirements: Some industrial processes or specialist applications need temperatures beyond what heat pumps can deliver efficiently.

A professional heat loss survey and site assessment will confirm whether a heat pump is suitable for your specific property. We offer free, no-obligation surveys — get in touch to arrange one.

How to Get an Accurate Quote

Online estimates are useful starting points, but only a site survey can produce an accurate quotation. Here's what a proper heat pump quote should include:

• Room-by-room heat loss calculation (MCS MIS 3005 requirement)
• System design showing heat pump model, cylinder specification, emitter schedule and control strategy
• Full scope of works including any radiator upgrades, pipework changes, electrical work and making good
• BUS grant confirmation with the voucher amount clearly deducted
• VAT position confirming 0% treatment where applicable
• Commissioning and handover including MCS certificate and Building Control notification

We provide detailed, transparent quotations following our 10/60/30 payment structure with no retention. Request your free survey and quote today.