Post-war homes (1945 to 1970s) and ECO4: questions UK households ask (guide 2026)

Guide by ApplyFreeBoiler.uk (Reliant Energy Solutions Ltd), a heating and insulation installer in Bury, Greater Manchester. We are not the government, Ofgem or an energy supplier.

Millions of UK homes were built between 1945 and the 1970s, from council estates to private semis. Many have cavity walls with no insulation, shallow loft insulation and older heating systems. This guide covers questions households commonly ask. It is general information from ApplyFreeBoiler.uk, a heating and insulation installer in Bury. What is recommended depends on the survey and the scheme rules at the time. This page does not guarantee funding.

1. Cavity walls

Many homes from this period have a cavity between two layers of brick that was left empty when built. The survey will check whether the cavity is suitable to fill.

2. System-built and concrete homes

Some post-war homes were built with concrete panels, steel frames or timber frames. Tell the surveyor if you know how your home was built, as this changes the options.

3. Loft insulation depth

Older lofts often have a thin layer of insulation. Clear the loft hatch area so the depth can be checked.

4. Old boilers and back boilers

Some homes still have back boilers behind a fire or very old boilers. Mention this, as removal and pipework changes can affect how the work is planned.

5. Windows and draughts

Single glazing or worn seals can let in cold air. Point out draughty windows and doors during the survey.

6. Ex-council homes

If you bought your home from the council, check whether any past improvement work was done and keep any paperwork you have.

7. Damp and ventilation

Point out any damp patches before work, and keep vents and extractor fans working afterwards.

8. Check funding and local figures

See ECO measures by council on ApplyFreeBoiler.uk, built from DESNZ Household Energy Efficiency statistics, to see how many ECO measures have been installed in your local authority area. Use the ApplyFreeBoiler.uk eligibility check to see whether an ECO4 heating or insulation pathway may be available for your home in England, Scotland or Wales. ECO4 is due to close on 31 December 2026.