Tell us about your wall insulation

We’re using this form to ask about solid wall insulation installed as part of either:

• the Energy Company Obligation 4 scheme (ECO4)
• the Great British Insulation Scheme (GBIS)

There are quality issues with some solid wall insulation fitted through these schemes. This can lead to problems like damp or mould.

Who can complete this form

You can only use this form if your insulation was installed as part of the GBIS or ECO4 scheme after April 2022.

If your insulation was installed between April 2022 and January 2025

You should have a letter from Ofgem with a Unique Measure Reference (UMR) number.

You can continue without the UMR number. It’s quicker for us to find your details if you have it.  

If your insulation was installed after January 2025

We have not sent you a letter with a UMR number, but you can still fill in this form.

What you need to do

Complete the questions with as much detail as you can.

You may need about 10 minutes to complete the form.

We'll review your form and contact you with more information.

If you smell gas

If you can smell gas or think you have a gas leak, call the National Gas Emergency Service on the number below. They’re open 24 hours a day.

If you are:

• in England, Wales and Scotland call free on 0800 111 999
• in Northern Ireland call free on 0800 002 001