UK Construction Products Industry Faces Scrutiny After Widespread Quality Failures Exposed

Serious weaknesses in product testing, certification and manufacturing controls have been uncovered across parts of the UK construction products industry, raising concerns about whether materials supplied for use in buildings consistently meet their declared performance standards and lead to quality failures.

Investigations by the Office for Product Safety and Standards (OPSS) have identified widespread failures involving construction materials marketed as meeting specific technical requirements. The findings have prompted enforcement action against manufacturers and suppliers, with regulators questioning the reliability of documentation, testing records and production controls used to demonstrate product conformity.

One of the most significant investigations concerned heat-soaked thermally toughened glass, a specialist product commonly used in commercial buildings, architectural glazing and other construction applications where reliability and resistance to spontaneous breakage are important.

Following intelligence suggesting systemic non-compliance and potential safety risks, OPSS conducted unannounced inspections at 28 UK manufacturers of heat-soaked thermally toughened glass.

The results revealed extensive weaknesses in the industry's quality assurance arrangements. Every manufacturer inspected initially failed to provide a compliant Declaration of Performance, a document used to communicate a construction product's performance against relevant technical requirements.

Inspectors also identified significant deficiencies in product marking, labelling, traceability and testing records, together with weaknesses in factory production controls.

The regulator issued nine Prohibition Notices preventing the supply of non-compliant products. A further 25 of the 28 manufacturers received warnings about their future conduct and were required to address identified deficiencies.

The findings have raised questions about the effectiveness of established manufacturing and conformity assessment processes within the sector, particularly where businesses rely on documentation to demonstrate that products meet customer and regulatory requirements.

The investigation forms part of wider regulatory activity examining the accuracy of performance claims made by construction product manufacturers and distributors.

In another investigation, OPSS examined specialist fire-rated plywood marketed as providing enhanced fire performance. Such products can command prices two or three times higher than standard plywood, reflecting the additional performance characteristics claimed by suppliers.

Concerns raised by London Fire Brigade prompted the regulator to investigate whether these claims were supported by appropriate evidence, testing and manufacturing controls.

The investigation extended to imported plywood and products treated within the UK, including arrangements where manufacturers subcontracted fire-retardant treatments to specialist providers.

Regulators discovered weaknesses in oversight of these outsourced activities, with neither manufacturers nor subcontractors securing the required conformity assessment in certain cases.

OPSS responded by issuing four Prohibition Notices, halting the supply of affected products and requiring recalls.

The findings have particular significance for the construction industry because product performance information is routinely relied upon by designers, contractors, building owners and procurement teams when selecting materials for use in buildings.

Where a product is incorrectly classified or its declared performance cannot be substantiated, the consequences can extend beyond contractual disputes or replacement costs. Incorrect information may influence design decisions, building performance and compliance with construction regulations.

The investigations also expose the difficulties businesses can face when responsibility for manufacturing, processing, testing and certification is distributed across several organisations.

A manufacturer may purchase materials from one supplier, outsource specialist treatment to another and rely on a third party to carry out testing. Without effective control of these arrangements, gaps can develop between the performance being claimed and the evidence available to support it.

The government's Product Regulation and Metrology Act 2025 provides the basis for further changes to the UK's product regulatory framework, with a particular emphasis on accountability across supply chains and the ability of regulators to respond to emerging product risks.

In its annual delivery report, OPSS stated that its regulatory approach is intended to protect consumers while supporting responsible businesses and encouraging confidence in the products placed on the UK market.

The regulator has also highlighted concerns involving heating products, where inaccurate performance information can affect purchasing decisions and the effectiveness of building systems.

Following complaints from the Manufacturers' Association of Radiators and Convectors, OPSS examined concerns that some radiator manufacturers and distributors were not meeting the requirements of BS EN 442, particularly in relation to declared heat output.

Overstated performance claims can result in customers purchasing products that do not deliver the heating capacity expected, potentially affecting building efficiency and the performance of heating installations.

The regulator worked with industry representatives to improve technical documentation, marketing information and Declarations of Performance, reporting improvements in awareness and compliance across the supply chain.

Taken together, the investigations reveal a recurring concern across different manufacturing sectors: the gap between a product's declared conformity and the evidence demonstrating that it actually meets the required specification.

For businesses operating quality management systems under ISO 9001, the findings are relevant to several established requirements, including control of externally provided processes, product verification, identification and traceability, management of documented information and control of nonconforming outputs.

The investigations also demonstrate why certification, technical declarations and supplier assurances cannot be treated as substitutes for effective operational controls.

Where manufacturing processes change, materials are substituted or specialist activities are outsourced, organisations need to maintain confidence that the resulting products continue to meet their intended requirements.

For the wider construction industry, the regulatory findings are likely to reinforce scrutiny of product testing, certification and traceability throughout procurement and installation.

As the UK continues to strengthen its construction product regulatory framework, manufacturers and suppliers face greater expectations to demonstrate that the performance characteristics they advertise are supported by reliable testing, accurate documentation and effective production controls.

The OPSS investigations show that these are not simply administrative requirements. They are fundamental to ensuring that products supplied to customers are what manufacturers claim them to be.