The UK’s housing stock leaks heat at a rate of about 8 cubic metres per second, enough to heat a small town. Yet the retrofit policy needed to fix this remains stuck in committee rooms and consultation documents. Last week’s CIOB retrofit discussion, as reported by Construction Management Magazine, brought together policymakers, builders, and housing associations. The verdict: the UK has a plan but no delivery system.
What a typical 3-bed semi faces
A 1980s semi-detached house in Manchester uses about 12,000 kWh of gas a year for heating. At the October 2024 price cap of £0.06 per kWh, that’s £720, before standing charges. Adding cavity wall insulation (typically £1,500–£2,500) and loft insulation (around £500–£800) could cut that bill by 30–40%, saving £200–£300 annually. The Great British Insulation Scheme closed on 31 March 2026. It funded insulation measures only and never covered windows or glazing. The reason? Homeowners don’t know it exists, or they can’t find a certified installer within 20 miles.
The installer gap costs you money
The CIOB discussion surfaced a brutal number: the UK needs 50,000 new retrofit installers by 2030 to meet net-zero targets. We have about 12,000 today. That shortage adds a premium of 15–20% to heat pump installations, pushing a typical air-source heat pump from £7,000 to over £8,500 after the Boiler Upgrade Scheme grant. The Department for Energy Security and Net Zero has pledged £1.5bn for skills, but the money won’t reach training centres until 2026. Homeowners in 2025 are paying the price of a delayed pipeline.
Grants exist, but they’re a maze
The Great British Insulation Scheme closed on 31 March 2026. It funded insulation measures only and never covered windows or glazing. Each has different eligibility rules, income thresholds, and application windows. Ofgem administers three of them; local councils handle two; the Department for Levelling Up runs one. No single portal exists. The Energy Saving Trust has called for a ‘one-stop shop’ since 2021. It hasn’t arrived. For a homeowner on a standard variable tariff, the result is confusion, and inaction.
But the catch goes deeper. Even when a household qualifies for ECO4 (for low-income homes), the scheme only covers 100% of costs if you’re on certain benefits. A self-employed plumber earning £28,000 a year in Birmingham falls through the gap: too rich for full ECO4, too stretched to pay £10,000 for external wall insulation. The government’s own impact assessment, seen by the i Paper, estimates that 2.3 million homes in that ‘missing middle’ will remain untreated by 2030.
What homeowners should do now
First, check your EPC rating via gov.uk. If it’s D or below, you’re losing money. The Great British Insulation Scheme closed on 31 March 2026. It funded insulation measures only and never covered windows or glazing. Third, if you’re planning a heat pump, book an installer now, even if installation is six months away: lead times are stretching. The Boiler Upgrade Scheme grant of £7,500 (from October 2024) is available, but only until March 2028 or until the £1.8bn fund runs out, whichever comes first. Ofgem’s data shows the fund is being drawn down at roughly £150m a quarter, so it will last until early 2028 at current rates. Don’t wait until 2027.
Frequently Asked Questions
The 2028 deadline requiring all private rentals to have an EPC rating of C or above is still official policy, but the CIOB discussion highlighted that only 40% of rentals currently meet that standard. A delay is likely, though the government has not confirmed one. Homeowners should still plan upgrades now to avoid a last-minute rush and higher installer costs.
Use the TrustMark website or the National Insulation Association's finder tool. Check for PAS 2035 certification, which is now mandatory for government-funded work. Avoid cold-callers offering 'free insulation', they may not meet standards and can invalidate your home insurance.
