What Does the Warm Homes Plan Fund?

What Warm Homes Plan funding actually pays for

When people ask what Warm Homes Plan funding covers, they are usually picturing a single grant for a single product. The reality is more useful than that. The Warm Homes Plan is the government’s flagship home-energy programme, a major multi-year investment aimed at upgrading millions of homes, and it funds a spread of measures rather than one item. The measures span insulation, air source heat pumps, solar PV, batteries and smart controls, primarily for homes, with some scope for community and smaller commercial buildings still under consultation.

The important nuance is that the Warm Homes Plan does not pay for those measures directly through one cheque. It funds them through several separate schemes, each with its own scope: the Energy Company Obligation (ECO4), the Great British Insulation Scheme, the Boiler Upgrade Scheme, the council-delivered Warm Homes: Local Grant, and a new finance route layered on top. So “what does it fund?” is really two questions: which physical measures are on the table, and which scheme pays for which. This guide covers both, with figures kept illustrative because the amount that reaches any one home depends on the property and the live scheme rules.

The measures on the table

Insulation

Insulation is the foundation of almost every funded package, and for good reason: it is among the most cost-effective ways to cut heat loss, and it makes everything else work better. Funded insulation can include loft, cavity wall, solid wall, room-in-roof and underfloor insulation. The Great British Insulation Scheme funds a single insulation measure, while ECO4 can bundle insulation with heating measures as part of a whole-house package. Insulation almost always lowers bills, which is why schemes treat it as the first move rather than an afterthought.

Heat pumps

Heat pumps are the headline low-carbon heating measure. The Boiler Upgrade Scheme pays 7,500 pounds towards an air source or ground source heat pump, with separate grant amounts available for some other low-carbon systems such as biomass boilers, for homes in England and Wales replacing a fossil-fuel system; check current rates on gov.uk. ECO4 and the Local Grant can also fund heat pumps as part of a wider package for eligible homes. It is worth being honest about cost here: a typical air source heat pump install runs in the region of 8,000 to 14,000 pounds, so the 7,500 pound grant covers a large slice but rarely all of it.

Solar PV, batteries and controls

Solar PV, battery storage and smart heating controls round out the list. Under ECO4, solar PV can be funded for eligible fuel-poor homes, and a funded package commonly includes smart controls so the heating system runs efficiently. Batteries and solar are also where the business and landlord route comes in, since these qualify as plant for capital allowances even where the domestic grant schemes do not apply.

How the measures are chosen

A common worry is that a funded scheme will simply install the cheapest thing. Reputable schemes do the opposite. Government-funded retrofit is fabric-first and follows a whole-house assessment under the PAS 2035 framework. In practice that means a qualified retrofit assessor surveys the property, a retrofit coordinator plans the measures in the right order, typically insulation before heating, and the completed work is documented and lodged with TrustMark.

This sequence is not bureaucracy for its own sake; it is what makes the outcome work. Insulating before a heat pump goes in is what lets the heat pump run efficiently and the bills come down. A funded home package therefore tends to combine insulation, a heat pump and smart controls, with an installed value in the region of 5,000 to 25,000 pounds depending on the property. Under ECO4 specifically, whole-house retrofit packages frequently exceed 15,000 pounds in installed value at no cost to eligible households. As an illustrative composite, a poorly insulated 1960s home on a means-tested benefit might receive cavity wall and loft insulation, an air source heat pump and controls as one bundled package, with the fabric work done before the heating. Every figure here is illustrative and depends on the home and the scheme rules at the time.

Which scheme funds which measure

Lining the measures up against the schemes makes the picture concrete:

• ECO4 can fund insulation, first-time central heating, heating upgrades, heat pumps and solar PV, at no cost, for eligible fuel-poor homes in EPC band D to G on qualifying benefits.
• The Great British Insulation Scheme funds a single insulation measure, with a General Group open to mid-band homes that needs no benefit at all.
• The Boiler Upgrade Scheme funds the heat pump itself, with the grant deducted from your MCS-certified installer’s invoice so you only pay the balance.
• The Warm Homes: Local Grant funds an insulation plus low-carbon heating package for lower-income households in England, delivered through your council.

These routes can also be combined. A household might use the Boiler Upgrade Scheme for the heat pump and ECO4 or the Great British Insulation Scheme for the insulation, so the fabric work is funded separately and the heating runs efficiently.

Where grants stop and finance or tax relief begins

The Warm Homes Plan does not pretend grants cover everything. Where a grant covers most but not all of a job, the programme introduces a multi-billion-pound finance route offering low or zero-interest loans for households who do not qualify for grants, designed to bridge the gap between a generous grant and the full install cost. For businesses and commercial landlords, the domestic schemes largely do not apply, so the main route is capital allowances: the 100 percent Annual Investment Allowance lets a business write off qualifying plant such as solar PV, heat pumps and batteries, worth up to a 25 percent effective tax saving in year one.

Our cost guide sets out where grants end and finance or tax relief takes over, and the grants and funding guide details each scheme in turn. If you want to picture the impact of a particular measure on your home, the savings calculator is a useful starting point, and you can tell us about your home for a steer on which measures and schemes fit. For the detail on the council-delivered package route, see our Warm Homes: Local Grant page. Everything here is general guidance; what the Warm Homes Plan funds for your home depends on your property, your eligibility and the live scheme rules at the time you apply, so confirm the specifics on the relevant gov.uk page before committing.