ISG Ltd
ISG Ltd was the United Kingdom’s sixth-largest construction contractor, with revenues of about £2.2 billion. In September 2024 it collapsed — eight ISG companies entered administration on 20 September and eleven went into liquidation — in what was universally described as the biggest UK construction-sector failure since Carillion in 2018. Around 2,200–2,400 staff lost their jobs, all sites closed, and more than £1 billion of UK government projects were thrown into doubt. ISG is the vault’s key recent case of Contractor Insolvency and Subcontractor Risk, showing the Carillion pattern repeating six years later.
ISG Ltd [relates] Contractor Insolvency and Subcontractor Risk ISG Ltd [part-of] United Kingdom
The payment story is, again, central evidence. Industry commentary estimated that ISG had effectively “borrowed” around £800 million from its contractors and suppliers through cash-flow management — using money owed to its supply chain as working capital, what one writer called the “Loyal Bank of Subcontractor” — and then defaulted on that unwritten loan. Warning signs were visible early: a subcontractor’s winding-up petition in October 2023 first stoked supplier and staff concern about ISG’s stability. On collapse, subcontractors were stood down with immediate effect and faced large unpaid invoices, particularly those on longer payment terms.
ISG Ltd [caused_insolvency_risk] Global Subcontractor Payment Delays ISG Ltd [relates] Construction Payment Pyramid
ISG’s significance for the vault is that it confirms structural persistence. The head of the Building Engineering Services Association said bluntly that “the lessons of Carillion have not been learned”. Build UK noted that while there had been “changes since Carillion six years ago… there clearly has not been enough change”. Economists predicted ISG’s collapse would itself push further firms under by damaging their cash flow. ISG therefore demonstrates that a major contractor using its supply chain as a bank, then failing and leaving subcontractors as unsecured creditors, is not a one-off (Carillion) but a recurring feature of the United Kingdom market — and reinforces the reform momentum behind the UK Late Payment Reform 2026.
ISG Ltd [supports] Construction Payment Problem
Connections
- Contractor Insolvency and Subcontractor Risk — ISG is the canonical recent example, source: 2024
- Carillion — the prior comparable collapse ISG echoes, source: 2024
- United Kingdom — jurisdiction of the collapse, source: 2024
- Construction Payment Problem — ISG confirms structural persistence, source: 2024
- UK Late Payment Reform 2026 — reform momentum reinforced by ISG, source: 2026