1.1 The government disagrees with the Committee’s recommendation. 1.2 The extent and scale of non-compliant external and internal wall insulation under the ECO4 scheme was unacceptable and must never be repeated. The department has greater confidence in the quality of installation and compliance in local authority delivered retrofit programmes and therefore disagree with the recommendation insofar as it relates to schemes other than ECO4 and GBIS. 1.3 Every household with external wall insulation (EWI) installed under ECO4 and GBIS is being and will be offered an on-site audit. Subject to the householder accepting the offer, all EWI installed under ECO4 and GBIS will be checked by an independent, trained and accountable auditor. 1.4 All households that received internal wall insulation (IWI) under ECO4 and GBIS are being written to and can raise concerns and request an audit via the Ofgem contact centre, which will be subject to triage. Where cases meet the threshold of risk factors, households are referred for an on-site audit by an independent, trained and accountable auditor. This includes all ongoing installations. This approach manages priorities and audit capacity in a practical way, taking account of the measured rates of non-compliance. 1.5 All EWI and IWI measures installed under ECO4 and GBIS schemes should have a guarantee that lasts for 25 years, meaning should issues be found in the future, the protections within the guarantee can be invoked within this timeframe.