Almost all homes fitted with external insulation under Conservative governments’ retrofit schemes need repair work, report finds

By Tom Lowe2025-10-14T10:29:00

National Audit Office survey uncovers litany of failures on two energy efficiency schemes including widespread suspected fraud

Almost all homes fitted with external insulation under two government retrofit schemes need remediation work to correct “major issues” including damp and mould, a report has found.

A survey by the National Audit Office (NAO) found 98% of homes given external wall insulation under the Energy Company Obligation (ECO) 4 and Great British Insulation Scheme (GBIS) will require repair work, affecting up to 23,000 homes.

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