Failed cavity wall insulation extraction across London

Failed cavity wall insulation – what this site is for

Cavity wall insulation is effective in suitable homes, but government guidance notes that in a small number of cases genuine problems arise from an installation (GOV.UK). Wet, slumped or poorly installed fill can bridge moisture across the cavity and show up as damp or mould on internal walls – symptoms that are easy to mistake for condensation or "rising damp".

We introduce London homeowners to independent specialists who can survey the cavity and, where needed, extract failed insulation. We don't carry out the work ourselves.

Typical extraction cost

Checkatrade's July 2026 cost guide puts whole-house removal at roughly £1,680–£2,520 (about £21.50 per m²) as a national average (Checkatrade). Urea-formaldehyde (UF) foam usually costs more to dispose of. London jobs are often higher – see the cost guide.

Who we help

• Homeowners with damp patches, mould or cold spots on external walls after cavity fill
• Sellers and buyers whose survey or lender has raised damp linked to cavity insulation
• Owners chasing a CIGA or scheme guarantee who need a clear survey report

Related problems we don't cover here

• Damp cause unknown? Start with an independent damp survey on our sister site.
• Spray foam in the loft? That's a different issue – see East London Spray Foam Removal.

Areas we cover in East London

East London is where we started – local guides for each area below.

South, North and West London

We also cover selected boroughs across the rest of London, with more areas to follow.

See all areas. Not listed? Send an enquiry anyway.

Guides

• Removal cost guide
• Signs of failed insulation
• How extraction works
• CIGA guarantee claims
• Mortgages & surveys
• Grants & ECO redress