Most UK households can cut their energy bill by 15-25% with measures that cost less than £500 in total — sometimes nothing. The Energy Saving Trust's data, refined annually, shows where the biggest wins live. This guide ranks the 12 highest-impact moves by payback for a typical 3-bed semi in 2026.
Turn the thermostat down 1°C: saves around £130/year for the average household. Most rooms feel identical at 19°C and 20°C. Set heating to come on 30 minutes earlier and off 30 minutes earlier rather than running longer.
Hot water cylinder thermostat at 60°C (legionella safe, no benefit higher). Combi boiler flow temperature reduced to 60°C for radiators (most are factory-set to 75-80°C, which prevents condensing efficiency). Saving: 6-8% of gas use.
A smart thermostat (Nest, Hive, Tado) costs £150-£250 installed and saves £75-£150/year through learning your routine and disabling heating when you're out. Payback 1-2 years.
Smart Thermostatic Radiator Valves let you set different temperatures per room. £40-£60 each and best for rooms used at distinct times (bedrooms warm only at night, spare rooms off entirely).
Draught-proofing strips around doors and windows, chimney balloons in unused fireplaces, and letterplate brushes typically cost £100-£200 in materials and save £75-£100/year. Payback 1-2 years and improves comfort dramatically.
Don't seal everything — kitchens, bathrooms and rooms with open-flue gas appliances need ventilation. Modern trickle vents on windows are usually sufficient.
LED bulbs throughout save £40-£60/year vs halogen and last 15-25 years. Replace as old bulbs fail, not all at once.
Air-dry clothes when possible: a tumble dryer costs around 75p per cycle, equivalent to £150/year for a household drying 4 loads a week. Eco mode on the dishwasher uses 15-20% less energy than the standard cycle for no real loss of cleaning.
Loft insulation top-up to 270mm if currently below: £200-£400 cost, £100-£180 annual saving, payback 2-4 years. Hot water cylinder jacket: £25, saves £35/year — payback under a year.
Switch tariff annually. The 2026 market has finally returned to genuine competition — fixed-rate deals at 5-10% below the price cap are widely available. Use Ofgem's accredited comparison sites.
Useful for visibility but they don't save energy directly — only the behaviour change they prompt does. Get one if you're on a time-of-use tariff (e.g. with an EV).
If your home is well-insulated and you can take a £7,500 BUS grant, possibly. Otherwise focus on insulation first — heat pumps are most cost-effective in efficient homes.
Yes for dishwashers and washing machines (longer but lower temperature). Often no for tumble dryers (longer at similar power).
ECO4, GBIS, Boiler Upgrade Scheme, Warm Homes and local authority funding explained. Eligibility, what's covered and how to apply in 2026.
Read guideReal payback periods for UK solar PV in 2026 — install costs, Smart Export Guarantee, batteries, time-of-use tariffs and what to ignore from cold callers.
Read guidePlain-English 2026 guide to the Boiler Upgrade Scheme, heat pump installation costs, running costs vs gas and how to decide if a heat pump suits your home.
Read guide