Air source heat pump installation costs in the UK: what to expect in 2026
Working out what an air source heat pump will actually cost is one of the first questions most homeowners have, and the honest answer is "it depends" — but there are useful benchmarks worth knowing before getting quotes.
As a general guide, installed air source heat pump costs in the UK commonly fall somewhere around £8,000-£15,000, with the exact figure driven mainly by property size, heat output required, and how much the existing heating system needs adapting. For a typical 3-bed semi, prices commonly sit around £8,000-£14,000; a larger 4-bed detached property, needing a bigger unit and more radiator or underfloor pipework changes, commonly runs around £12,000-£18,000. These are broad market ranges rather than a single "correct" price, and your actual quote depends heavily on your specific property, so treat any figure — including these — as a starting point for comparison rather than a guarantee.
What's normally included in a quoted price is worth checking carefully, since this is where quotes can look different for reasons that have nothing to do with quality. A properly itemised quote should cover the heat pump unit itself, a hot water cylinder (heat pumps typically need one, since they don't heat water instantly the way a combi boiler does), indoor controls and thermostats, all necessary pipework, commissioning (getting the system running and calibrated correctly), and MCS certification paperwork if you're claiming the Boiler Upgrade Scheme grant. What's sometimes not included, and worth asking about explicitly, is upgrading radiators — heat pumps generally run at lower flow temperatures than a gas boiler, and older, smaller radiators sized for a boiler system sometimes need replacing with larger ones to heat a room adequately at the lower temperature a heat pump supplies.
After applying the £7,500 Boiler Upgrade Scheme grant (or £9,000 for eligible oil/LPG off-grid homes, as of the 21 July 2026 enhanced rate), net cost for many households commonly falls somewhere in the region of £500-£10,500, depending heavily on the base installation price before the grant is deducted. Because the range before the grant is already wide, the range afterwards is wide too — this is genuinely a "get quotes for your specific property" situation rather than one where a single average figure is meaningfully useful for budgeting.
Running costs, once installed, come down largely to a heat pump's efficiency, commonly expressed as SCOP — Seasonal Coefficient of Performance. Unlike COP, which is a single lab-test snapshot, SCOP measures average efficiency across a full UK heating season, accounting for the fact that a heat pump works harder, and less efficiently, on the coldest days than on a mild one. A SCOP of 4.0, for example, means that on average across the season, the system delivers roughly four units of heat for every one unit of electricity it consumes — a genuinely efficient outcome compared with resistive electric heating, which delivers close to one unit of heat per unit of electricity. A higher SCOP directly reduces your running costs relative to your electricity price, all else being equal, so it's a genuinely useful number to compare between quotes rather than just looking at the unit's rated capacity.
One factor that meaningfully affects achievable SCOP is the temperature the heating system runs at. Heat pumps generally achieve a higher SCOP, and so run more cheaply, when paired with a heating system that operates at lower flow temperatures — underfloor heating is a classic example, since it heats a large surface area gently rather than needing a small radiator to run very hot. This is one reason underfloor heating and heat pumps are commonly recommended together, particularly in a new build or a full renovation where installing underfloor heating is practical.
When comparing quotes, ask each installer for the manufacturer's stated SCOP for the specific model and flow temperature they're proposing for your home, rather than a generic marketing figure — SCOP varies with the actual operating conditions, so the number that matters is the one calculated for your system as designed, not a headline figure from a spec sheet. Getting at least two or three quotes from MCS-certified installers, each covering the same basic scope (unit, cylinder, pipework, any radiator upgrades), is the most reliable way to see whether a given price reflects the actual job or an incomplete specification that will need extras added later.
Frequently asked questions
Installed costs commonly range around £8,000-£15,000 depending on property size, with roughly £8,000-£14,000 typical for a 3-bed semi and £12,000-£18,000 for a larger 4-bed detached home, before any Boiler Upgrade Scheme grant is deducted.
A proper quote should include the heat pump unit, hot water cylinder, indoor controls, pipework, commissioning and MCS certification paperwork; radiator upgrades are sometimes quoted separately, so it is worth confirming explicitly whether these are included.
SCOP (Seasonal Coefficient of Performance) measures a heat pump's average efficiency across a full heating season rather than a single test snapshot; a SCOP of 4.0 means roughly four units of heat are delivered per unit of electricity used, and a higher SCOP generally means lower running costs.
Generally yes — heat pumps typically achieve a higher SCOP when paired with a heating system that runs at a lower flow temperature, and underfloor heating, which warms a large surface area gently, commonly allows lower flow temperatures than smaller radiators.