Nearly 6 million UK households are in fuel poverty this winter, according to the latest National Energy Action figures. That is one in five homes, and the number is rising as the price cap hovers near £1,800 a year.
Nesta, the UK innovation agency for social good, has published a blueprint for cutting £130 off that bill. The report, as reported by Nesta, lands as Greater Manchester mayor Andy Burnham prepares his own energy announcement. It is a rare moment of cross-party consensus: the quickest route to cheaper bills runs through the fabric of the home itself.
Where the £130 comes from
Nesta’s model breaks the saving into three chunks. Draught-proofing doors, windows and floorboards saves about £45 a year. Topping up loft insulation from 100mm to 270mm, the current building regs minimum, saves another £40. Smart thermostat optimisation, including automated scheduling and zone control, saves £45.
The catch is that these measures deliver only if the home is already reasonably airtight. A 1960s semi with single glazing and no cavity fill will lose the gains through the walls. Nesta’s figures assume a typical 3-bed semi with 12,000 kWh annual gas use and 3,000 kWh electricity, the median for England and Wales, per Ofgem’s latest Typical Domestic Consumption Values.
Energy Saving Trust puts the cost of professional draught-proofing at £200–£300 for a 3-bed semi. Loft insulation for the same property costs £300–£500 if you pay a contractor, or about £150 for DIY rolls from B&Q. Smart thermostats start at £80 for a basic Hive or Nest model. Total upfront spend: £580–£880. Payback period: 4.5 to 6.8 years, well within the average 12-year stay of a UK homeowner.
Who qualifies, and who doesn’t
The Great British Insulation Scheme, launched by the government in 2023, offers free or heavily subsidised loft and cavity wall insulation for households in EPC bands D to G with an income under £31,000. Ofgem’s latest data shows the scheme has reached 120,000 homes so far, but the target is 300,000 by March 2026. If you qualify, the upfront cost drops to zero.
For those above the threshold, the Boiler Upgrade Scheme provides £7,500 toward a heat pump, but Nesta’s report focuses on fabric measures first. The logic is simple: a heat pump running in a draughty house costs more to run than a gas boiler in the same house. Insulate first, then electrify.
What this misses is the 4 million private rented homes where tenants cannot alter the fabric. Nesta’s report calls for a national landlord licensing scheme to force minimum EPC C by 2028, a deadline the government pushed back from 2025 last year. Renters in the lowest-rated homes pay an average £300 more a year than similar homes in band C, according to the Resolution Foundation.
What you can do by next week
Three actions cost nothing but time. First, check your loft insulation depth with a tape measure, if it is below 270mm, order DIY rolls. Second, fit draught excluders to external doors and seal skirting boards with decorator’s caulk (£5 a tube). Third, use your smart meter’s in-home display to identify which appliances run during peak hours (4pm–7pm) and shift them to overnight or midday.
Ofgem’s data shows households with smart meters and time-of-use tariffs save an average of £60 a year, with no upfront cost. Octopus Energy’s Agile tariff, for example, offers negative pricing on windy days, your meter can literally credit your account for charging an EV or running a washing machine.
Nesta’s £130 figure is an average, not a guarantee. A 1-bed flat with electric heating will see smaller savings; a 5-bed detached house with oil boiler will see more. The principle holds regardless: the cheapest kWh is the one you do not use.
Frequently Asked Questions
For a typical 3-bed semi, loft insulation costs £300–£500 and saves about £40 a year on heating bills. That gives a payback period of 7.5 to 12.5 years. However, if you qualify for the Great British Insulation Scheme, the cost is fully covered and the savings are immediate.
Proper draught-proofing targets gaps in doors, windows and floors but leaves trickle vents and extractor fans clear. The Building Regulations require minimum ventilation rates to prevent condensation and mould. A professional draught-proofer will test airflow with a smoke pencil and fit seals that maintain safe air changes per hour.
