Non-traditional and prefab homes 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.

After the Second World War, many UK councils built homes using non-traditional methods such as precast concrete panels, steel frames or timber systems instead of brick and block cavity walls. Many of these homes are now privately owned. Their walls behave differently from standard cavity walls, which raises a few common questions when a home is assessed for ECO4. 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. Say how the home was built

If you know the construction type, for example concrete panels or a steel frame, tell the surveyor. If you are not sure, say so.

2. Mortgage or survey reports

A previous homebuyer survey or mortgage valuation may name the construction type, so keep it to hand.

3. Previous repairs

Mention any structural repair or recladding work done on the home or on neighbouring houses of the same type.

4. Wall condition

Point out cracks, rust stains, damp patches or spalling concrete on the outside walls.

5. Insulation

Say whether the loft is insulated and whether any wall insulation has been fitted before.

6. Your current heating

Say what heating you use now and roughly how old your boiler is.

7. Clear access

Clear space around the boiler, meters and loft hatch before the survey visit.

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.