Grants and funding for solar panels for housing associations

Funding for social-housing solar has never been stronger, but it is also more competitive and more tightly time-bound than most landlords are used to. The money is real, the deadlines are hard, and the rules around match funding, PAS 2035 compliance, and grant defrayal are unforgiving. This page sets out the routes that matter in 2026 and how they fit together.

The Warm Homes Plan: the umbrella over everything

The £13.2bn Warm Homes Plan, confirmed at the 2025 Spending Review, is the government-wide programme that funds home decarbonisation across 2025-26 to 2029-30. It covers insulation grants, low-income household upgrades, low and zero-interest loans for solar, batteries and heat pumps, and crucially for social landlords, the Warm Homes: Social Housing Fund. It also funds retrofit-skills training to grow the supply chain. Think of it as the framework the specific funds sit within, not a fund you apply to directly.

Warm Homes: Social Housing Fund: the flagship

This is the main event for registered providers and local-authority landlords in England. Wave 3 of the Warm Homes: Social Housing Fund, the successor to the Social Housing Decarbonisation Fund, has £1.29bn-plus confirmed for 2025 to 2028 (with a later £100m uplift) and aims to upgrade around 100,000 homes. It targets existing social homes at EPC band D to G. There are two routes: a Challenge Fund for landlords with a minimum of around 100 eligible properties, and Strategic Partnerships for delivery at real scale (around 4,000 homes). It is match funding, not full cost, the landlord contributes alongside the grant. The delivery window runs to September 2028, and grant must be spent by 31 March 2028, so defrayal sequencing matters as much as the bid itself.

What funders want to see is a fabric-first, PAS 2035-compliant programme with credible archetype modelling, a clear tenant-benefit plan, and a realistic delivery schedule that spends the money on time. We build exactly that: bid-ready packages with the SAP and EPC uplift modelled per house type and the delivery batched so grant is defrayed before the deadline.

ECO4 and ECO4 Flex: topping up the lowest-rated homes

The Energy Company Obligation funds whole-house retrofit for low-income and fuel-poor households in properties rated EPC D or below, paid for by obligated energy suppliers rather than the landlord. ECO4 Flex lets local authorities refer fuel-poor or vulnerable households who fall outside standard means-tested criteria, which can bring more of a landlord's stock into scope. ECO4 runs to 31 December 2026 and requires PAS 2030/2035 and TrustMark certification. It blends well with the Warm Homes Fund as a way of covering measures on the very lowest-rated social homes, and it is most useful when stacked rather than used alone.

Smart Export Guarantee: ongoing income, not a grant

The Smart Export Guarantee is not capital funding, it is an ongoing income stream from exported electricity, currently 4 to 15p/kWh, that can subsidise the wider programme over the system's life. It applies to MCS-certified installs and is mandatory for licensed suppliers with 150,000-plus customers. The key decision is who registers and benefits from it. On dwelling-level installs the most tenant-friendly model lets residents self-consume the generation (the bill saving) while the landlord, or a split-benefit partner such as Octopus Tenant Power, takes only the surplus export. That income, modest per home but meaningful at portfolio scale, is part of how a programme pays for itself.

Affordable Homes Programme: for new build and regeneration

Where the work is new build or regeneration rather than retrofit, the Affordable Homes Programme is the route. Administered by Homes England (and the GLA in London), it funds new affordable and social homes built to the Future Homes Standard, where rooftop solar is effectively standard. Designed-in PV costs far less than retrofit, often around 40% cheaper, and pairs naturally with air-source heat pumps and a fabric-first envelope. If you are building or regenerating, get solar onto the drawings at design stage and fund it through this programme rather than retrofitting later.

How the routes stack, and the pitfalls

These funds are designed to be combined. A typical programme uses the Warm Homes: Social Housing Fund as the core capital, ECO4 to cover the lowest-rated homes, SEG income to subsidise over the system's life, and the Affordable Homes Programme for any new-build strand. The mistakes we see most often are bidding without a deliverable defrayal schedule (the money has to be spent on time, not just won), underestimating the PAS 2035 retrofit-coordinator overhead, and assuming direct award is allowed when compliant procurement through a framework like Fusion21 or Procurement for Housing is effectively required under the Procurement Act 2023. We handle the modelling, the compliance, and the procurement route so the funding actually lands and gets spent.