Homes with conservatories 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.

Conservatories are popular across the UK, but they can be hard to keep warm in winter and hot in summer. When a home is assessed for ECO4 heating or insulation, a conservatory raises a few common questions. 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. Is the conservatory heated?

Tell the surveyor whether the conservatory has radiators linked to the main heating. This can affect how the heating system is assessed.

2. Doors between the house and conservatory

Keeping a door between the house and conservatory closed in winter helps keep heat in the main rooms.

3. The wall behind the conservatory

The original outside wall may now sit inside the conservatory. Ask whether it can still be checked or insulated.

4. Conservatory roofs

Polycarbonate or glass roofs lose heat quickly. Mention any plans you have to change the roof.

5. Condensation and damp

Point out condensation or mould in the conservatory or the rooms next to it.

6. Boiler and radiator sizing

If the conservatory is heated, the boiler and radiators need to suit the extra space. Ask how this is worked out.

7. Access

Clear the area if the surveyor needs to see walls, pipes or the loft above rooms next to the conservatory.

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.