An energy-efficient home needs less energy to provide the same level of comfort. Suitable insulation and draught proofing can reduce heat loss, but the best starting point depends on the home and the problem you want to solve.
Before choosing a product, decide what matters most: a cold bedroom, high heating use, draughts, or understanding an existing EPC. Those questions can lead to different decisions.
What could improve?
Warmth and comfort. Reducing heat loss can help a room stay warmer. Roof insulation, wall insulation and draught proofing address different routes through which heat escapes. Adding a product somewhere in the house does not establish that it will solve the cold room you are concerned about. Energy Saving Trust explains the main options.
Heating demand. A home that retains heat better can need less heating to maintain a chosen temperature. For example, suitable loft insulation reduces heat escaping through the roof. The result depends on what is already installed and the condition of the building.
Running costs. Using less energy can reduce costs, but a saving in energy is different from a guaranteed saving on a bill. Your tariff, the weather and how you heat the home also matter. If you choose to heat a previously cold room more comfortably, part of the benefit may be extra warmth rather than a lower bill.
Start with one room and a specific problem
Compare these two requests:
- "My upstairs bedroom is cold even when the heating is on. Please assess what is causing it and explain the options."
- "Please supply the cheapest insulation."
The first gives an adviser a problem to investigate. The second asks for a product before its suitability has been established.
Write down which rooms are affected, when you notice the problem and what improvements have already been made. Bring any available plans or installation records to the discussion. Ask the adviser to explain why the proposed work addresses your particular concern.
Why do savings estimates differ?
A published example describes a particular type of home under stated assumptions. It is not a quote or a forecast for your household. Before relying on a figure, ask:
- Does the example resemble my property and its existing insulation?
- What energy prices and heating pattern does it assume?
- Does the price include preparation, installation and making good?
- What other work is needed for the proposed improvement to function properly?
Keep the answers alongside each quote. This helps you compare what you would receive, rather than comparing two headline prices for different jobs.
Keep ventilation and the building's condition in view
Draught proofing should reduce unwanted gaps while retaining ventilation that the home needs. Do not block ventilation openings to make a room feel warmer; see Energy Saving Trust's draught-proofing guidance.
Older buildings also need an approach suited to their construction. Historic England's home-energy guidance is a useful starting point for traditional and historic homes. Discuss damp, leaks and existing defects before agreeing improvement work.
Where does an EPC fit?
Your EPC offers a starting point for understanding the property's modelled performance. Its recommendations can help you prepare questions, but they do not replace an installation design or a quote for the actual building.
Find an existing EPC first, then read our guide to understanding its rating and estimates. When you are ready to discuss materials, use our insulation comparison guide.
If you need a new certificate for a London property, see our EPC prices and booking information.
Sources checked: 22 October 2026. This guide helps you prepare for a discussion about improvements; the right specification depends on your building.