Commercial heat pump grants in London: funding routes and local context

Serving London and the wider Greater London area, including Croydon, Bromley, Dartford.

Why commercial heat pumps make sense for London businesses

London carries the largest concentration of commercial floorspace in the UK and, with it, the largest commercial heating bill. The capital’s offices, hotels, care homes, hospitals, and light-industrial buildings burn an enormous quantity of gas every winter, and for most of them the boiler is the single biggest source of carbon on site. With the Greater London Authority committed to a 2030 net zero target, one of the most ambitious of any major authority in the country, the pressure on commercial landlords and occupiers to get off gas heat is sharper here than almost anywhere else.

A commercial heat pump moves heat rather than burning fuel, delivering three to four units of heat for every unit of electricity. For a London business that means removing on-site combustion entirely, stabilising heating costs against a volatile gas market, and producing the kind of auditable Scope 1 reduction that London’s corporate tenants, public bodies, and institutional landlords increasingly demand. The case is strongest where an ageing gas boiler is nearing failure and the building runs year-round, which describes a large share of the capital’s commercial estate.

London’s commercial geography and where heat pumps fit

Park Royal, straddling the boundary of Ealing, Brent, and Hammersmith and Fulham, is the largest industrial estate in Europe and a natural focus for commercial heat decarbonisation. The estate hosts food production, cold storage, logistics, and light manufacturing, much of it with significant year-round heat and hot-water demand. Buildings here often suit cascaded air-source systems that can be sited in an external louvred compound, and the food and process tenants are exactly the kind of operations that can recover waste heat from refrigeration to lift overall efficiency.

The Greenwich Peninsula and the wider Stratford and Olympic Park districts represent a different opportunity: large mixed-use developments and campuses where a central energy centre and an ambient heat network can serve multiple buildings at once. Schemes of this scale are the kind the Green Heat Network Fund supports (England and Wales; Round 12 closed on 25 September 2026, so check gov.uk for the next round). The Old Kent Road industrial area, earmarked for major regeneration, and Brent Cross, with its town-centre redevelopment, fall into the same category, building stock being renewed at a pace that makes low-carbon heat planning sensible from the outset rather than as a retrofit afterthought.

Across the core boroughs, the office, hotel, and care-home estate is where most retrofit heat pump work happens. High daytime occupancy, year-round hot-water demand in hospitality and care, and the planning pressure of conservation areas all shape the design. For listed and conservation-area buildings, of which London has more than any other UK city, the siting and acoustic design of external plant has to be handled carefully, which is where an acoustic assessment (BS 4142 is the usual method) and early engagement with the borough planning team are worth the effort.

The Greater London Authority’s net zero target and what it means for your project

The Greater London Authority’s 2030 net zero ambition is supported by the London Environment Strategy and the London Plan, which together push decarbonisation across the capital’s buildings. The London Plan expects new major commercial development to be highly energy-efficient and to move away from fossil-fuel heating, and the London Energy Efficiency Fund provides finance to public buildings pursuing exactly this kind of work. For a commercial building owner or occupier, three things follow.

First, the policy direction is towards lower-carbon heat in commercial buildings, and acting early can protect asset value and tenant demand rather than waiting to be forced. Second, the public-sector estate, the boroughs’ own buildings, NHS sites, schools, and universities, should note that the Public Sector Decarbonisation Scheme is for public bodies, but Phase 4 closed to new applications in November 2024 with no open window or confirmed successor, so check gov.uk. Third, the capital’s mature supply chain and heat-network activity make multi-building ambient-loop schemes more achievable here than in most regions.

Local cost and grid context: what London businesses face

Indicatively, a London SME with 50 to 250 staff spends meaningfully more on energy than the national average, around £95,000 a year is a reasonable mid-band figure for a single site, and large industrial or hospitality operations spend several times that. Those high baseline bills are part of why heat pump economics tend to work well in the capital: the more heat you currently buy, the more a good SCOP saves you.

The harder constraint in London is electrical supply. A large heat pump adds significant load, and parts of the capital’s distribution network are capacity-constrained, so a DNO supply upgrade can be the longest-lead item in the whole project. An installer should confirm available capacity at feasibility and, where supply is tight, look at hybrid designs, phasing, or demand management to keep the project moving. Space is the other London-specific pressure: plant rooms are small and external siting is contested, which makes careful acoustic and visual design essential, particularly in the conservation areas that blanket much of inner London.

An illustrative London scenario: Park Royal cold store

Consider a cold-storage and distribution facility at Park Royal running an ageing pair of gas boilers for space heating and process hot water alongside its refrigeration plant. The boilers are near end of life, the operator has a corporate net-zero commitment, and the building runs year-round. A 320 kW cascaded air-source heat pump, sited in an external louvred compound and designed to recover waste heat from the refrigeration circuit, replaces the gas plant. Flow temperatures are kept low where the emitters allow, lifting the SCOP and holding running cost close to the previous gas cost.

The expected outcome is on-site combustion cut by around 80 percent (indicative), a substantial annual carbon saving for the operator’s Scope 1 reporting, and plant cost that may qualify for capital allowances. Capital allowances are a tax relief on qualifying plant; it applies to the cost the business itself funds, so confirm treatment with an accountant. The old boilers would be kept live through commissioning so the cold store is never without heat, and the changeover planned outside the peak winter weeks. Every figure in an installer’s proposal should come from twelve months of the building’s actual consumption data, not an estimate.

Location guides across London and the surrounding region

This guide covers commercial heat pump considerations across all of Greater London’s postcode areas, from the EC and WC business districts through the E, N, and SE boroughs to the SW and W residential-commercial corridors. Beyond the capital itself, many businesses run multi-site portfolios reaching into the surrounding home counties, so the same points apply across Croydon, Bromley, Dartford, Watford, and Slough, and out towards Reading, Luton, and Brighton. Each of these has its own local authority with its own climate strategy, which is worth checking wherever the buildings sit.

If you manage estate or energy across several London sites, ask an installer to treat them as a programme rather than one building at a time, prioritising the buildings where the gas boiler is closest to failure and the heat pump case is strongest.

Funding and next steps for London heat pump projects

The route that fits depends on what you are. London’s public bodies, boroughs, NHS trusts, schools, and universities should note that the Public Sector Decarbonisation Scheme is for public bodies, but Phase 4 closed to new applications in November 2024 with no open window or confirmed successor, so check gov.uk. The Industrial Energy Transformation Fund is closed, with no successor planned, so industrial and data-centre sites should not plan around it. Large campus and mixed-use schemes may be candidates for the Green Heat Network Fund (England and Wales; Round 12 closed on 25 September 2026, so check gov.uk for the next round). Smaller systems up to 45 kWth may qualify for the Boiler Upgrade Scheme in England and Wales, which is not limited to homes; confirm eligibility with the installer or Ofgem. Every business paying UK tax can look at capital allowances such as the Annual Investment Allowance (£1m a year), which are tax reliefs on qualifying plant and machinery; they apply to the cost the business itself funds, so confirm treatment with an accountant. Our grants and funding guide sets out each route and who it suits, and our cost page explains what drives the capital and running-cost figures.

A good installer will start from your consumption data, model running cost and carbon, flag any DNO supply constraint early, and tell you whether a heat pump is the right move for your building yet. This guide sets out what to ask. Send an enquiry and we reply by email. This site is not an installer and gives no price.