Homes with solar panels 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.

Some households already have solar panels on the roof and wonder how this affects an ECO4 heating or insulation assessment. 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. Have your solar paperwork ready

Keep any installation certificate, inverter details and the type of panels (electric PV or solar hot water) to hand.

2. Tell the surveyor about the panels

Say where the panels, inverter and any battery are installed so they can be noted during the survey.

3. Loft access and cabling

Solar cables often run through the loft. Clear the hatch so the surveyor can see the loft and any cable routes.

4. Solar hot water cylinders

If you have solar thermal panels, mention the hot water cylinder. This matters when heating or hot water options are discussed.

5. Roof condition

Mention any roof leaks or damp patches near the panels.

6. Your current heating

Say what heating you use now, how old it is and which rooms stay cold.

7. Access on the day

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