The Federation of Master Builders has renewed calls to introduce a mandatory licensing scheme for all domestic retrofit workers following yesterday’s National Audit Office report on widespread failures in two government energy efficiency schemes.

A survey by the NAO found 98% of homes fitted with external wall insulation through the Energy Company Obligation (ECO) 4 and Great British Insulation Scheme (GBIS) will need remediation work to fix “major issues” including damp and mould.

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