Homes with roof windows and skylights 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.

Roof windows and skylights are common in loft rooms, extensions and bathrooms. They bring in light, but the roof around them can be awkward to insulate, and they are a common place for condensation and draughts. That raises a few common questions when a home with roof windows 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. Where they are

Tell the surveyor which rooms have roof windows or skylights, and whether they sit in a loft room, an extension or a flat roof.

2. Condensation

Mention any condensation, drips or mould around the window frames, especially in winter.

3. Leaks

Say whether any roof window has leaked or been resealed, even if it seems fine now.

4. Draughts and cold spots

Note rooms with roof windows that feel draughty or cold near the ceiling.

5. Blinds and access

Say whether there are fitted blinds or anything stored near the windows that might need moving for the survey.

6. Your boiler

Say roughly how old your boiler is, where it is located and whether it has had faults.

7. Clear access

Clear space around the boiler, meters and any 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.