Sixty per cent of UK homes have an EPC rating of D or below, according to the Energy Saving Trust. That means millions of households leak heat through draughty lofts, single-glazed windows, and uninsulated cavity walls. The government’s new Warm Homes Plan, announced on 28 February 2025, commits £3.8bn over a decade to fix this, the biggest single investment in domestic energy efficiency in a generation.
As reported by The Independent, the plan targets 300,000 homes a year by 2028, with a mix of grants, low-interest loans, and mandated minimum standards for landlords. But the devil is in the detail, and the delivery.
Who qualifies, and who doesn’t
The Warm Homes Plan funnels most of its £3.8bn through local authorities. That means eligibility depends on where you live, not just your income. Households on means-tested benefits or with a household income below £31,000 will get first priority for free insulation and heat pump installations. Owner-occupiers earning more than that can apply for a low-interest loan, typically at 3% APR, capped at £15,000 per property. Landlords with EPC ratings below C must upgrade by 2030 or face fines of up to £30,000 per property.
The catch is timing. The first wave of grants opens in April 2025 for social housing and low-income households. Owner-occupiers can apply from October 2025. But local authorities have not yet published their delivery plans, and some have already warned of staffing shortages.
What it costs a typical 3-bed semi
A typical 3-bed semi in the Midlands uses around 12,000 kWh of gas and 3,000 kWh of electricity a year, according to Ofgem’s typical domestic consumption values. With the current price cap at £1,738 a year, that household faces annual bills of roughly £2,100. The government estimates the Warm Homes Plan could reduce that by £400 to £500 a year, mainly through loft insulation (saving £200-£300) and a heat pump (saving £200-£300 on gas).
But the upfront cost remains steep. A full retrofit, insulation, double glazing, heat pump, solar panels, can cost £25,000 to £40,000. The grants cover up to 80% for low-income households, but only 50% for others. The loan option caps at £15,000, which leaves a gap of £10,000 to £25,000 for most owner-occupiers.
The EPC impact, and the rental deadline
EPC ratings measure energy efficiency from A (most efficient) to G. Moving from a D to a C typically saves £500 a year on bills and adds 5% to property value, according to the Building Research Establishment. The Warm Homes Plan offers grants specifically for measures that lift a home from D to C: cavity wall insulation (£800 grant), loft insulation (£400), and double glazing (£2,500).
For landlords, the 2030 deadline is non-negotiable. The government will enforce minimum C ratings for all new tenancies from 2028, with all existing tenancies requiring C by 2030. Landlords can apply for grants of up to £10,000 per property, but they must act before 2027 to secure the funding.
What to do now
Households on standard variable tariffs can check eligibility through the Energy Saving Trust’s online tool from April 2025. Local authority websites will list approved installers from March 2025. For owner-occupiers, the smartest move is to get an EPC assessment first, cost £60-£120, to identify the cheapest upgrades that lift your rating to C. Then apply for the grant before the October 2025 wave opens. Landlords with D-rated properties should start quoting for works now; installers are already booking into 2026.
Frequently Asked Questions
Owner-occupiers can apply from October 2025 through their local authority. Low-income households and social housing tenants get priority from April 2025.
No. Grants cover up to 80% for low-income households, but only 50% for others. The maximum grant is £7,500 for a heat pump installation, which typically costs £10,000 to £14,000.
