MPs urge SFO probe into ECO insulation scandal: quality and risk lessons for engineers
Reviewed by Joe Ashwell

First reported on The Construction Index
30 Second Briefing
MPs on the House of Commons public accounts committee have urged ministers to refer the Energy Company Obligation (ECO) insulation scandal to the Serious Fraud Office after the National Audit Office found 98% of external and 29% of internal wall insulation installed by mid‑January 2025 was defective. Ofgem has so far identified fraudulent installations worth 1.75% of scheme value, but PAC members believe actual fraud is far higher, citing systemic failure across DESNZ, TrustMark and UKAS, and a fragmented quality-assurance regime. The committee warns that the new Warm Homes Plan, expected to scale up measures such as solar PV and further retrofit, must be backed by far tighter technical oversight and accountability to avoid repeating these failures.
Technical Brief
- PAC describes the ECO redesign as “doomed to failure” due to fragmented, siloed oversight structures.
- DESNZ took two years to recognise systemic quality problems, allowing large volumes of defective work to accumulate.
- TrustMark and UKAS admitted missing early risk signals, despite holding accreditation and technical assurance roles.
- Recommended remediation demands coordinated surveys, risk prioritisation and funding clarity to avoid homeowners bearing repair costs.
- Monitoring going forward will need centralised defect data, clear responsibility for fraud detection and rapid stop‑work triggers.
Our Take
Within our 96 Policy stories, the United Kingdom features frequently in pieces tagged 'Safety' and 'Standard/Guideline', signalling that UK regulators such as Ofgem and TrustMark are under sustained scrutiny for how effectively they translate policy into enforceable technical standards.
A 98% defective external wall insulation rate under the ECO scheme is extreme even by the standards of our 346 tag-matched 'Failure' items, suggesting that future UK retrofit or Warm Homes Plan contracts are likely to embed much tighter installation verification and independent accreditation requirements.
For contractors and certifiers operating in the UK, the combination of high defect rates and Ofgem’s quantified 1.75% fraud finding increases the likelihood that DESNZ and the Serious Fraud Office will push for more forensic data trails on installations, making record-keeping and traceable workmanship a core commercial risk issue rather than an administrative afterthought.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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