Watkin Jones and Kingspan Insulation Ltd

Watkin Jones, a major UK developer specialising in build-to-rent and student accommodation, has filed a £7.5 million High Court claim against Kingspan Insulation Ltd over alleged fire-safety defects associated with insulation products used on one of its residential schemes.
The claim centres on remediation work undertaken following the post-Grenfell regulatory overhaul, which triggered extensive re-assessment of external wall systems across the UK. Watkin Jones argues that Kingspan’s insulation — later found unsuitable under strengthened fire-safety standards — required costly replacement that could have been avoided had the manufacturer provided reliable, accurate product information from the outset.
Background

• The project used Kingspan’s phenolic foam insulation, a class of product scrutinised extensively during the Grenfell Inquiry.
• After updated government guidance and the introduction of the Building Safety Programme, Watkin Jones commissioned safety assessments that concluded the wall system failed to meet current fire-performance expectations.
• Watkin Jones undertook substantial remedial work, costing around £7.5 million, which it is now seeking to recover from Kingspan.

Allegations Against KingspanWatkin Jones alleges that Kingspan:

• misrepresented the fire-safety performance of its insulation;
• provided incomplete or misleading fire test data;
• failed to warn of known performance issues in real-world installations; and
• contributed to the installation of an external wall system later found non-compliant under post-Grenfell safety standards.

Kingspan denies the claims and disputes liability.
Regulatory and Financial ContextThe claim arises squarely from the heightened building-safety environment that followed the Grenfell Tower fire, including:

• strict bans on combustible materials on high-rise buildings;
• new obligations under the Building Safety Act 2022;
• widespread re-testing of insulation and cladding;
• deeper scrutiny of manufacturer fire-testing practices.

While the building may have met regulatory standards at the time of construction, Watkin Jones argues that the manufacturer’s representations and testing practices were flawed, causing today’s multi-million-pound remediation burden.
Financial ImpactThe £7.5 million sought reportedly covers:

• removal of Kingspan insulation;
• installation of compliant fire-safe materials;
• scaffolding and access costs;
• consultants and professional fees;
• delays and disruption linked to project occupation and use.

The case highlights the clear financial consequences of historic product-data inadequacies exposed by modern fire-safety testing and regulatory reform.
Wider SignificanceThis lawsuit exemplifies the emerging trend of developers retrospectively pursuing manufacturers for remediation costs linked to:

• historic testing discrepancies,
• incomplete data, and
• marketing of materials later deemed unsafe.

It contributes to the growing litigation landscape shaped by the Grenfell Inquiry and Building Safety Act, which is shifting liability toward product manufacturers when their safety information is found wanting.

The case is ongoing.