Inflation dips to 2.8% but energy bills remain the real test for homeowners

The headline figure landed at 2.8%, down from 3.2% in March. But for the 18 million households on standard variable energy tariffs, the real story is not in the Office for National Statistics spreadsheet. It is in the letters landing on doormats this month from suppliers, warning of higher direct debits.

As reported by CNBC, the slowdown is expected to be short-lived. Ofgem’s price cap for October is already projected to rise by another £63, pushing the typical dual-fuel bill above £1,900 for the first time since winter 2023.

What inflation does to your retrofit budget

Every percentage point of inflation adds roughly £150 to the cost of a typical air-source heat pump installation, according to industry estimates from the Heat Pump Association. A system that cost £7,000 in 2022 now runs closer to £8,300, before the £7,500 Boiler Upgrade Scheme grant is applied.

Solar panels have not escaped either. The average 4 kW system, which came in at £5,500 in early 2023, now costs around £6,200. That is a 13% jump driven by higher raw material prices and logistics costs. For a 3-bed semi in Manchester, the payback period has stretched from 8 to nearly 10 years.

The catch is that delaying a retrofit because of inflation is a false economy. Every year you wait, the EPC rating stays at D or below, and the house leaks heat at a cost of roughly £300 a year in wasted gas. The Energy Saving Trust calculates that solid-wall insulation, even at current prices, pays back within 7 years for a typical 1930s semi.

Grants and tariffs: the inflation buffer that is shrinking

The Boiler Upgrade Scheme, launched in 2022, offers £7,500 for heat pumps. That sum has not changed. But inflation has eroded its real value by about 15% since launch. The same is true of the Energy Company Obligation (ECO4), which funds insulation for low-income households, the grant amounts are fixed, but installation costs have risen.

What this means in practice: a household eligible for ECO4 cavity wall insulation in 2022 got the work done for free. Today, some suppliers are asking for a contribution of £200–£400 because their fixed grant no longer covers the full cost. Ofgem confirmed to MPs last month that it is reviewing the grant rates, but no changes have been announced.

For homeowners not on benefits, the smartest hedge against inflation is a fixed-rate energy tariff. Several suppliers, including Octopus and EDF, are now offering 12-month fixes at rates below the current price cap. Fixing now locks in a rate of roughly 24p per kWh for electricity and 6p for gas, versus the projected 26p and 7p from October.

What to do before the next price cap rise

First, check your EPC rating. A home rated C or above uses roughly 25% less energy than a D-rated property. The Great British Insulation Scheme closed on 31 March 2026. It funded insulation measures only and never covered windows or glazing. Apply through gov.uk before the October price cap rise.

Second, compare heat pump quotes from at least three MCS-certified installers. The Boiler Upgrade Scheme is open until 2028, but the grant amount is fixed. The sooner you install, the more you save relative to inflation.

Third, if you are on a standard variable tariff, switch to a fixed deal now. Use a comparison site that shows the annual cost in pounds, not just the unit rate. A typical 3-bed semi using 12,000 kWh of gas and 3,000 kWh of electricity could save £120–£180 a year by fixing.

Inflation at 2.8% is not a crisis. But for a homeowner trying to decarbonise on a fixed income, it is a slow bleed. The price cap rises in October. The grants are static. The only variable you control is the date you start.