Find an insulation installer

Choosing a qualified and accredited installer is essential to ensure your insulation is safe, effective, and eligible for government grants or insurance-backed guarantees.

Where to find accredited installers

We recommend using these official directories to find professionals in your area:

1. TrustMark

TrustMark is the Government-endorsed quality scheme for home improvements. Any installer working under government grant schemes (like ECO4 or GBIS) must be TrustMark registered.

2. National Insulation Association (NIA)

The NIA represents the insulation industry in the UK. Their members must sign up to a strict code of professional conduct.

3. Cavity Insulation Guarantee Agency (CIGA)

If you are specifically looking for cavity wall insulation, CIGA provides a directory of installers who can offer a 25-year independent guarantee.

Questions to ask your installer

Before hiring anyone, you should ask the following questions:

  1. Are you TrustMark registered? This is the gold standard for quality and consumer protection.
  2. What guarantees do you offer? Look for independent, insurance-backed guarantees (like those from CIGA or SWIGA).
  3. Will you provide a ventilation strategy? Especially for wall and floor insulation, the installer must explain how they will maintain airflow to prevent damp.
  4. Can you help with grant applications? Many installers are authorized to apply for government funding on your behalf.
  5. Can I see references or case studies? Ask for examples of similar work they have done on properties of the same age as yours.

Important: Always get at least three quotes for major insulation work. This helps you compare not just the price, but also the proposed materials and the quality of the technical survey.

Red flags to watch out for

  • Cold callers: Reputable insulation installers rarely sell their services door-to-door or via unsolicited phone calls.
  • Pressure to sign: Never sign a contract or pay a large deposit on the day of the first visit.
  • No technical survey: An installer should always perform a detailed survey of your property’s condition before giving a final quote.