How to Improve Home Energy Efficiency UK
Improving energy efficiency is one of the best ways to cut bills and make your home more comfortable. In the UK, the biggest wins usually come from reducing heat loss (insulation and draught proofing) and improving how you control heat (thermostats, TRVs, and better boiler settings). This guide covers practical upgrades, quick wins, and where to look for support and grants.
Start With Insulation (Highest Impact)
If your home leaks heat, you have to pay to replace it. Loft insulation, cavity wall insulation (where suitable), and sealing obvious draughts can reduce heat loss dramatically and improve comfort quickly.
Upgrade Heating Controls
- Use schedules: Heat rooms when you need them, not all day by default.
- Use TRVs: Lower temperatures in unused rooms.
- Consider smart controls: If they help you avoid overheating and improve scheduling.
Optimise Boiler and Heating Settings
Many homes run boilers hotter than necessary. For condensing boilers, lowering the flow temperature can improve efficiency when radiators can still keep rooms warm. Keeping the system clean (filters, inhibitor) and servicing annually also helps performance.
Windows, Doors and Draught Proofing
Draughts make homes feel colder than the thermostat suggests. Simple fixes like door seals, letterbox brushes and curtain linings can improve comfort. Double or triple glazing can help, but it's often a bigger investment—prioritise insulation first if budgets are tight.
Grants and Support in the UK
Depending on your situation, you may be eligible for support with insulation and heating upgrades. Schemes change over time, so check current criteria and approved installers before committing.
Get the Right Boiler Size for Your Home
If you're improving efficiency and considering a boiler upgrade, the right size is crucial. Our boiler size calculator recommends a sensible kW range based on your home and hot water needs.
Use the Boiler Size CalculatorFrequently Asked Questions
What are the best energy efficiency upgrades for a UK home?
Loft insulation, draught proofing and better heating controls are often top value. If suitable, cavity wall insulation can be another big win.
Should I focus on insulation or a new boiler first?
Insulation usually comes first because it reduces heat demand and makes any heating system cheaper to run. If your boiler is failing, you may need to replace sooner, but don't skip insulation long-term.
Do smart thermostats really save money?
They can if they reduce heating time and prevent overheating. Savings depend on how you use them and how insulated your home is.
Is lowering boiler flow temperature worth it?
Often yes for condensing boilers, because it can improve efficiency. The best setting depends on your radiator sizing and heat loss.
Where can I find grants for home energy upgrades?
Eligibility varies and schemes change over time. Check current UK government and local authority guidance and use approved installers where required.