Room-in-roof insulation under ECO4: what UK households should know (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.

Homes with a bedroom or living space built into the roof often lose heat through the sloping ceilings, short walls and small loft spaces around that room. Room-in-roof insulation is a measure that can be offered through ECO4. This guide explains what is involved. It is general information from ApplyFreeBoiler.uk, a heating and insulation installer in Bury. Your surveyor and installer will explain what applies to your home. This page does not guarantee funding.

1. What counts as a room in roof

It is a habitable room inside the roof space, such as an attic bedroom or a loft conversion, rather than an empty loft used for storage.

2. Which parts get insulated

The work can cover the sloping ceilings, the short knee walls, the flat ceiling above the room and the small eaves spaces behind the walls, depending on what the survey finds.

3. How the survey works

The surveyor measures the room, checks how each part was built and looks for damp, roof leaks or wiring that would need attention before any insulation goes in.

4. Disruption to expect

Some areas may be insulated from the eaves spaces, while others may need boarding and plastering inside the room. The room will usually need to be cleared for the work.

5. Ventilation still matters

The roof timbers need air moving around them. Installers leave ventilation gaps where needed, so do not block eaves vents or roof vents afterwards.

6. Decorating afterwards

Where new boards and plaster are fitted, they normally need to dry before painting. Ask your installer how long to leave it.

7. 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.