A shared ground loop cuts your heat pump installation cost by roughly half
A shared ground loop heat pump system is a single buried pipe network that serves two or more homes, with each property containing its own indoor heat pump unit. The primary cost saving comes from sharing the most expensive part of a ground source heat pump installation: the ground works, which include drilling or trenching.
The trade-off is significant. You need agreement from neighbours, a legal easement for the land, and a single owner, often a managing company or housing association, for the external loop. The Energy Systems Catapult describes these systems as a viable route to lower upfront costs, but only where multiple households can coordinate (Energy Systems Catapult, 2026).
A shared ground loop costs £8,000–£12,000 per home
The shared loop cost covers your share of the ground array and your indoor heat pump unit, while the dedicated system cost includes a full private borehole or trench. The Energy Saving Trust gives median figures for a 3–4 bedroom home: a dedicated ground source heat pump installation costs £18,000–£28,000, whereas a shared ground loop system costs £8,000–£12,000 per home (Energy Saving Trust, 2026).
Additional costs include legal fees for the shared-loop agreement, typically £500–£1,500 per household, and ongoing maintenance of the communal loop, often £100–£200 per year per home. These figures assume a shared loop serves 3–6 homes on a single plot of communal land.
Quick numbers dedicated vs shared ground loop heat pump for a typical UK semi-detached home
| Cost or performance metric | Dedicated ground source | Shared ground loop | Gas boiler (reference) |
|---|---|---|---|
| Cost per home (installed) | £18,000–£28,000 | £8,000–£12,000 | £2,500–£4,000 |
| Annual running cost (based on 2026 Ofgem price cap) | £600–£800 | £600–£800 | £900–£1,200 |
| Typical Coefficient of Performance (COP) | 3.5–4.5 | 3.5–4.5 | 0.85–0.95 (efficiency) |
| Annual CO2 saving vs gas boiler | 1.6 tonnes | 1.6 tonnes | N/A |
| Grant available (Boiler Upgrade Scheme 2026) | £7,500 | £7,500 per home | None |
Running costs are based on the January 2026 Ofgem price cap of 24.5p/kWh for electricity and 6.0p/kWh for gas (Ofgem, 2026). The heat pump COP of 3.5–4.5 means it delivers 3.5 to 4.5 kWh of heat for every 1 kWh of electricity used.
The shared ground loop uses a single external pipe network
Each home has its own heat pump unit, typically 5–8 kW in capacity, which draws heat from the shared brine loop. The loop itself is sized for the total heat demand of all connected homes and is usually installed as a horizontal trench or vertical borehole array on communal land.
Performance is identical to a dedicated system because the ground temperature is the same. The MCS 022 standard confirms that the Coefficient of Performance (COP) for a shared ground loop heat pump is typically 3.5–4.5, matching that of a private ground source system (MCS, 2026). The indoor unit functions exactly as a standard heat pump would, with no special controls or setup for the shared loop.
You can get the £7,500 Boiler Upgrade Scheme grant for a shared ground loop
The Boiler Upgrade Scheme (BUS) pays £7,500 per home for a ground source heat pump, and this includes shared-loop installations. Eligibility requires that each home has its own MCS-certified heat pump installation, and the shared ground loop must be designed and installed by an MCS-certified contractor.
The grant is applied per property, not per loop. So if four homes share a loop, each can claim £7,500, bringing the total possible grant to £30,000 for that loop. The Department for Energy Security and Net Zero (DESNZ) guidance confirms that the BUS applies to shared ground loops as long as each heat pump unit is separately MCS-registered (GOV.UK, 2026).
A shared ground loop heat pump saves roughly 3,000 kWh of gas per year per home compared to a gas boiler
Based on a typical UK home using 12,000 kWh of gas annually for heating and hot water, the heat pump uses approximately 3,000 kWh of electricity to deliver the same heat. This represents a saving of 9,000 kWh of primary energy per year.
Annual CO2 saving works out at roughly 1.6 tonnes per home, using the 2026 grid carbon intensity of 0.18 kgCO2/kWh (DESNZ, 2026). The carbon saving is identical to a dedicated ground source heat pump because the electricity consumption per unit of heat delivered is the same.
You need an MCS-certified installer for the grant
MCS certification is mandatory for the heat pump unit in each home. The shared ground loop itself does not need MCS certification, but the installer of the loop must be MCS-registered for the overall system. TrustMark is also required for any BUS-funded installation (TrustMark, 2026).
The shared-loop agreement must cover several key points: ownership of the loop, maintenance responsibilities, cost-sharing for repairs, and what happens if a neighbour sells or moves. Legal advice is strongly recommended, as the agreement becomes a covenant on the property title. Without a clear written agreement, a neighbour’s sale could leave you responsible for the entire loop’s upkeep. guide to heat pump installation costs UK
Finding an MCS-certified installer for a shared ground loop system can be more difficult than for a standard heat pump. Not all installers have experience with communal ground arrays. The MCS installer directory allows you to filter by system type (MCS, 2026). Boiler Upgrade Scheme eligibility requirements
Frequently Asked Questions
A shared ground loop heat pump costs £8,000–£12,000 per home, roughly half the £18,000–£28,000 for a dedicated ground source system, according to the Energy Saving Trust (2026).
A shared ground loop is a single buried pipe network serving multiple homes, each with its own indoor heat pump unit. The Energy Systems Catapult says it cuts upfront costs by sharing the expensive ground works.
Permitted development rights often cover ground source heat pumps, but a shared loop may need planning permission if it involves communal land. Check with your local planning authority, as requirements vary by area.
A shared ground loop saves £10,000–£16,000 per home versus a dedicated ground source heat pump, based on Energy Saving Trust median figures for a 3–4 bedroom UK home.
Annual running costs for a shared ground loop heat pump are £600–£800 per home under the 2026 Ofgem price cap, plus £100–£200 for communal loop maintenance.
