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Select Committee · Public Accounts Committee

Faulty energy efficiency installations

Status: Open Opened: 10 Jul 2025 19 recommendations 20 conclusions 1 report

The Energy Company Obligation 4 (ECO4) and the Great British Insulation Scheme (GBIS), both funded via energy consumers’ bills, are government schemes for the installation of energy-efficiency improvements in people’s homes, such as insulation. Not-for-profit quality assurance company TrustMark identified issues with both schemes, with government announcing in January 2025 issues including insufficient ventilation, missing …

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Reports

1 report
Title HC No. Published Items Response
62nd Report - Faulty energy efficiency installations HC 1229 23 Jan 2026 39 Responded

Recommendations & Conclusions

2 items
2 Recommendation 62nd Report - Faulty energy efficiency … Accepted in Part

Set out plans to scale-up the find-and-fix programme for faulty home insulation.

Nearly one year after the problems emerged, around 3,000 homes with defects had been found and fixed out of the more than 30,000 homes estimate to be affected. TrustMark, the government-endorsed quality scheme, did not notify the Department of high levels of faulty installations of external wall insulation until October …

Government response. The government accepted the recommendation in part, confirming the find-and-fix programme reached full operational delivery in January 2026, aiming for completion by May 2027, and detailing how faulty internal wall insulation cases will be addressed. However, it stated that delivering …
HM Treasury
1 Conclusion 62nd Report - Faulty energy efficiency … Accepted in Part

Widespread major issues found in ECO4 and GBIS insulation installations

On the basis of a deeply concerning report by the Comptroller and Auditor General, we took evidence from the Department for Energy Security and Net Zero (the Department) and Ofgem to find out why an estimated 98% of external wall insulation and around a third (29%) of internal wall insulation …

Government response. The government disagreed with the committee's conclusion that failings undermine confidence in all retrofit schemes, stating it has greater confidence in local authority-delivered programmes. However, it accepted the severity of issues within ECO4 and GBIS, detailing multiple actions taken including …
HM Treasury

Oral evidence sessions

1 session
Date Witnesses
13 Nov 2025 Clive Maxwell CB CBE · Department for Energy Security and Net Zero, Deborah Chittenden · Department for Energy Security and Net Zero, Jeremy Pocklington CB · Ministry of Defence, Jonathan Brearley · Department for Energy Security and Net Zero, Jonathan Brearley · Ofgem, Kiera Schoenemann · Ofgem, Matt Gantley · United Kingdom Accreditation Service (UKAS), Simon Ayers MBE · TrustMark View ↗

Correspondence

6 letters
DateDirectionTitle
21 May 2026 From cttee Letter to the Permanent Secretary at the Department for Energy Security and Net…
23 Feb 2026 To cttee Letter from the Interim Permanent Secretary at the Department for Energy Securi…
12 Jan 2026 To cttee Letter from the Chief Executive Officer of the Installation Assurance Authority…
8 Dec 2025 To cttee Letter from the Chief Executive of the UK Accreditation Service relating to the…
8 Dec 2025 To cttee Letter from the Interim Permanent Secretary at the Department for Energy Securi…
1 Dec 2025 To cttee Letter from the Chief Operating Officer at TrustMark relating to the Committee’…