Retrofit isn’t optional – it’s the only way to fix Britain’s leaky homes

The IWFM 2026 Sustainability Survey puts retrofit at the top of the corporate agenda. For the first time, facilities managers rank refurbishment and building upgrades above new-build energy efficiency. That shift matters to every homeowner in Britain – because the same logic applies to your house.

As Facilitate Magazine reports, the survey of 500+ professionals found that 68% now prioritise retrofit over other sustainability measures. The reason is simple: the UK’s existing building stock – 29 million homes, most built before 1990 – accounts for 20% of national emissions. You can’t reach net zero without fixing them.

Who qualifies – and who doesn’t

The survey’s findings mirror government policy. The Social Housing Decarbonisation Fund and Home Upgrade Grant already target low-income and off-gas-grid homes. But the next wave – the Great British Insulation Scheme – is open to any household with an EPC below C, even those on average incomes. Ofgem figures show the scheme has reached 340,000 homes since 2023, but applications remain slow in some regions.

The catch is timing. The Boiler Upgrade Scheme, which offers £7,500 off a heat pump, closes to new applications when the current budget runs out – typically by March 2026. The Future Homes Standard, due in 2025, will ban gas boilers in new builds but does nothing for the 23 million existing homes that still burn gas. Retrofit is the only game in town.

What it costs a typical 3-bed semi

A full retrofit – cavity wall insulation, loft top-up to 270mm, draught-proofing, double glazing, and a heat pump – runs £15,000–£25,000 depending on the property. But you don’t need to do it all at once. The Energy Saving Trust estimates that cavity wall insulation alone saves £290 a year on gas bills. Loft insulation adds another £180. Combined with a smart thermostat, you’re looking at a payback period of 4–6 years for the cheapest measures.

The survey highlights that ‘fabric first’ – improving the building envelope before installing new heating – is the most cost-effective route. That aligns with the government’s own advice: insulate first, heat later. A heat pump in a draughty home will cost more to run than a gas boiler. But in a well-insulated one, it can cut heating bills by 30%.

Yet the IWFM survey also flags a barrier: skills. There are not enough trained retrofit assessors or installers. The government’s target of 600,000 heat pump installations a year by 2028 looks ambitious when current capacity is below 50,000. Homeowners may face waiting lists of 6–12 months for a full survey and quote.

What this misses – and what you should do now

The survey focuses on commercial and public sector buildings. For homeowners, the timeline is less clear. The government has not confirmed a mandatory EPC C target for owner-occupiers, though the 2024 Conservative manifesto proposed one by 2035. Labour has not committed to a date. But the direction is unmistakable: every major party wants higher standards, and the cost of inaction – higher energy bills, lower property values – will only grow.

Start with a free EPC assessment. Most homes rated D or below can move to C for under £5,000 using insulation and draught-proofing alone. The Great British Insulation Scheme closed on 31 March 2026. It funded insulation measures only and never covered windows or glazing. For heat pumps, apply to the Boiler Upgrade Scheme before March 2026. And if you’re planning a major renovation, include retrofit measures now: adding insulation later is far more expensive.

The IWFM survey confirms what energy analysts have said for years. Retrofit is not a niche activity. It is the central challenge of UK energy policy. For homeowners, the question is not whether to act, but when. Acting now locks in lower bills, higher EPC ratings, and a warmer home. Waiting means higher costs, tighter deadlines, and a scramble for limited installer capacity.