The average UK household spends £1,800 a year on energy, but one London council has found a way to shave £200 off that for its tenants. Hammersmith & Fulham Council is rolling out a programme of insulation, solar panels, and upgraded heating controls across its social housing stock. The result: tenants pay less, the council cuts its carbon footprint, and the local EPC ratings climb.
As reported by the London Borough of Hammersmith & Fulham, the scheme targets the worst-performing homes first. But the question for the 15 million private homeowners in the UK is: how do you get the same £200 saving without a council programme behind you?
Who qualifies, and who doesn’t
The council scheme covers only social tenants. Private homeowners and private renters are on their own. That gap matters because 60% of homes with an EPC rating below C are owner-occupied, according to the Energy Saving Trust. The government’s Great British Insulation Scheme, launched in 2023, offers free or subsidised loft and cavity wall insulation to households on certain benefits or with an EPC rating of D or below. But the take-up has been slow: only 40,000 homes upgraded in the first year against a target of 300,000.
For homeowners not on benefits, the scheme still offers a partial subsidy, but the average cost of loft insulation is £300–£600. Payback time: roughly two years on a typical 3-bed semi using 12,000 kWh of gas. That is £200 a year saved, identical to the council’s figure.
What it costs a typical 3-bed semi
Insulation is the cheapest win. A 3-bed semi with no loft insulation loses about 25% of its heat through the roof. Adding 270mm of mineral wool costs around £500 and pays for itself within three winters. Cavity wall insulation runs £700–£1,200 and saves £160–£240 a year, according to the Energy Saving Trust. Solar panels on a south-facing roof cost £6,000–£8,000 and save £300–£500 a year, but the payback period stretches to 12–15 years without a battery.
Heat pumps are the big ticket. The Boiler Upgrade Scheme offers £7,500 towards an air-source heat pump, which typically costs £7,000–£13,000 installed. For a well-insulated home, running costs can undercut a gas boiler by 20–30%, about £150–£250 a year on a typical bill. But the catch: if your home is draughty, the heat pump will struggle and cost more. Ofgem’s data shows that heat pump installations rose 50% in 2023, but only 30% of homes have adequate insulation to make them efficient.
The real barrier to retrofit
Money is not the only problem. The UK has about 25,000 qualified retrofit assessors and 10,000 certified installers, according to the Construction Industry Training Board. That is not enough to retrofit 29 million homes by 2050. The council scheme in Hammersmith uses bulk procurement to drive down costs, a model that individual homeowners cannot replicate. But the Green Home Finance Accelerator, run by the Department for Energy Security and Net Zero, is testing low-interest loans for homeowners. Pilot results are due in late 2025.
What this misses is the sheer inertia of the private market. Most homeowners do not think about insulation until the boiler breaks or the EPC becomes a selling point. Yet the £200 saving from the council scheme is achievable for anyone willing to spend £500 on loft insulation and three hours in the loft. The Energy Saving Trust estimates that 8 million homes still have less than 100mm of loft insulation. That is £1.6 billion in wasted heat every year.
Three steps to your own £200 saving
First, check your loft. If it has less than 270mm of insulation, top it up. Second, apply for the Great British Insulation Scheme via gov.uk, eligibility runs until March 2026. Third, get an EPC assessment. If your rating is D or below, the scheme’s subsidy covers most of the cost. For private renters, the Minimum Energy Efficiency Standards require landlords to achieve an EPC rating of E or above, rising to C by 2030. You can request upgrades via your local council’s environmental health team.
Households on standard variable tariffs can apply for insulation grants through gov.uk from today. The £200 saving is not a council perk, it is a physics problem with a cheap fix.
Frequently Asked Questions
Install loft insulation (costs £300–£600, pays back in 2–3 years) or cavity wall insulation (£700–£1,200, saves £160–£240 a year). Check eligibility for the Great British Insulation Scheme at gov.uk.
The Great British Insulation Scheme offers free or subsidised insulation for EPC D or below households. The Boiler Upgrade Scheme provides £7,500 off a heat pump. Both are available via gov.uk.
