Warm Homes Loan Scheme: Cheap Solar Loans Expected September 2026

Cheap government-backed loans for solar panels are closer than almost anyone reported. The Department for Energy Security and Net Zero (DESNZ) published the official rules of the Warm Homes Loan Scheme in June 2026, closed its first application window for lenders on 17 July 2026, and expects the first loans to be available to the public in September 2026, once approvals are secured.

That is months earlier than the "2027" timeline widely quoted when the Warm Homes Plan was announced in January. And the published Scheme Rules contain concrete numbers nobody had until now: a £15,000 loan cap for solar PV, another £15,000 for battery storage, no income-based eligibility thresholds, and landlords included.

Here is everything the official documents actually say, what is confirmed versus expected, and whether it is worth waiting for.

What Is the Warm Homes Loan Scheme?

The Warm Homes Loan Scheme (WHLS) is the lending arm of the government's £15 billion Warm Homes Plan. While the plan's grants target low-income households, the loan scheme targets everyone else: the "able to borrow" majority who could repay a loan but are put off by today's borrowing costs.

It works through banks and lenders, not a government portal. The government has committed £300 million of grant capital that participating lenders draw down, and the Scheme Rules are explicit about where that money goes: "the grant must be passed on to borrowers by reducing the nominal interest rate". The wider plan allocates up to £1.7 billion to low and zero-interest consumer loans as the programme scales.

The Key Facts From the Official Scheme Rules

Loan products can be unsecured personal loans, point-of-sale finance arranged through your installer, or loans secured against the property. Leasing and subscription products are excluded from the first phase.

Will the Loans Be 0% Interest?

Not necessarily, and this is where the headlines got ahead of the documents. The Warm Homes Plan talks about "low and zero-interest" loans, but the Scheme Rules leave pricing decisions with each lender. The government subsidy must reduce the rate you are offered, and it only applies to terms of three years or longer, but the actual APR will depend on which lenders join and how they price their products.

Realistically, expect rates meaningfully below today's 6 to 10% unsecured loan market, with some lenders potentially reaching 0% on shorter terms. We will know actual rates when products launch, since lender product approval only opened in July and August 2026.

Who Qualifies?

The eligibility rules are broader than any solar support scheme the UK has run before:

• Owner-occupiers of existing homes, with no income caps and no requirement to be on benefits
• Private landlords, borrowing personally, including for multiple properties (one loan per property)
• No minimum EPC rating and no property-type restrictions at scheme level
• Standard credit and affordability checks still apply, run by the lender as with any loan

That last point matters: this is a normal, FCA-regulated loan with a subsidised rate, not a grant. If you would not pass a credit check for a personal loan, the scheme does not change that. If your household is on a qualifying benefit, check the grant route first, because free is better than cheap.

What Can You Borrow For?

The eligible measures list covers most of a modern home energy setup:

• Roof-top solar PV systems, up to £15,000 including scaffolding, grid connection and installation costs
• Battery storage, up to £15,000, standalone or with solar
• An EV chargepoint, if installed as part of a solar or battery installation
• Heat pumps (up to £20,000 for air source, £35,000 ground source, stacking with the Boiler Upgrade Scheme grant), plus domestic wind and micro-hydro

Roof repairs and insulation are not covered, though lenders can offer separate ordinary finance for those. A typical £6,600 to £8,500 4kW solar installation sits comfortably inside the cap, as does a full solar-plus-battery system.

The Timeline: What Happens When

DESNZ stresses the timings are indicative. But lenders have applied, the rulebook is published, and the machinery is visibly moving, which puts "autumn 2026" on much firmer ground than the vague "2027" that circulated in January.

Should You Wait for It?

If the scheme launches on time, it is roughly six weeks away, so this is a genuine question for anyone quoted for solar right now. Our take:

• Paying cash, or offered genuine 0% APR today? Do not wait. E.ON Next, So Energy and BOXT already offer 0% finance over 2 to 3 years, and a system installed in August starts cutting bills in August. The scheme cannot beat 0%.
• Only offered 7 to 10% APR, or need a longer term? Waiting a few weeks could save real money. The subsidy applies to terms of 3 years and longer, exactly where today's market is expensive.
• A landlord? This is the first mainstream scheme built to include you, with one loan available per property. Get quotes lined up now.

Either way, the sensible preparation is identical: get 3 or more quotes from MCS-certified installers so you know your number before the loans arrive. Every WHLS loan will require an MCS installer anyway.

The Bottom Line

The Warm Homes Loan Scheme is the most significant change to how the UK pays for solar since 0% VAT arrived in 2022. It will not make solar free, and the exact rates are still unknown. But cheaper borrowing over longer terms, with landlords included and no income tests, removes the biggest barrier for the millions of households who want solar and simply do not have £7,000 in the bank. September is close. Get your quotes ready.

For the full scheme background and updates as details land, see our Warm Homes Plan loans guide. To compare everything available today, from 0% supplier deals to green loans, start with the solar panel finance guide.

Sources

• DESNZ, Warm Homes Loan Scheme: Scheme Rules (June 2026), gov.uk
• DESNZ, Warm Homes Loan Scheme: apply to participate as a lender, Phase 1, gov.uk
• DESNZ, Warm Homes Plan policy paper, gov.uk
• MoneySavingExpert, Warm Homes Plan coverage, January 2026