Construction product reform will increase the value of specification evidence.
The government’s Construction Products Reform White Paper is a reminder that product compliance is not only a technical issue. It can become a contractual, evidential and recovery issue. The White Paper forms part of a wider reform programme intended to strengthen the construction products regime, close longstanding gaps in regulatory coverage, and bring all construction products within a more robust safety and accountability framework. The government consultation states that the White Paper is the next step following the Construction Products Reform Green Paper and seeks views on reform of the construction products regime.
For contractors, the practical risk is not limited to whether a product is safe or unsafe in regulatory terms. The commercial risk is whether the contractor can prove what product was required, what was offered, what was approved, what was substituted, what was installed, and whether the final installed product matched the contractual and regulatory basis on which the works were procured. If a product is challenged later, the contractor’s position may depend less on broad assertions of compliance and more on the quality of the project record.
Why product evidence matters
Construction product reform is moving the market toward greater scrutiny of product safety, product information, accountability, testing, certification and regulatory coverage. The White Paper refers to bringing all construction products into the regime through a general safety requirement and to strengthening confidence in a large and complex sector. That direction of travel matters because product disputes are rarely limited to the product itself. If a compliance issue, defect allegation or building safety concern emerges later, the questions are likely to be wider:
Was the product within the original specification?
Was the contractor responsible for product selection or only installation?
Was there a design responsibility issue?
Was the substitution proposed by the contractor, requested by the employer, or developed by the design team?
Was the relevant product data issued, reviewed and accepted?
Did the product meet the declared performance requirements?
Were installation requirements followed?
Were inspection, testing, certification and handover records properly retained?
Those questions are contractual and evidential. They affect entitlement, responsibility, payment, defects liability, professional interface risk, final account positions and dispute strategy.
Why this matters to contractors
For many contractors, product decisions are made under pressure during live delivery. A specified product may become unavailable. Lead times may change. A cheaper equivalent may be proposed. Design information may be incomplete. The employer or consultant may request a substitution. A subcontractor may recommend an alternative. A value engineering exercise may alter the product basis. Programme pressure may encourage quick decisions. At the time, these decisions may feel practical and commercial. Later, they may become the centre of a dispute.
That is particularly important where the approval route is unclear. A contractor may believe a substitution has been accepted because it was discussed, emailed, included in a submittal, or installed without objection. But if the approval is not clearly evidenced, the same decision may later be characterised as unauthorised, non-compliant or outside the contractor’s entitlement. The issue is not only whether the product was acceptable. The issue is whether the contractor can prove the contractual route by which it became acceptable.
Where disputes are likely to arise
Construction product reform is likely to make several types of dispute more evidence-sensitive.
The first is specification compliance. If the contract required a particular product, standard, performance level or certification route, the contractor will need records showing that the product installed matched those requirements or that any departure was properly authorised.
The second is substitution and value engineering. Where products are changed during delivery, the contractor needs a clear record of the reason for the change, who proposed it, who approved it, whether it affected cost or programme, and whether the contractual change mechanism was followed.
The third is design responsibility. Product compliance disputes often expose uncertainty over who carried design risk. If the contractor is design-responsible, the evidential burden may be different from a position where the contractor installed products specified by the employer’s design team.
The fourth is testing and certification. The White Paper reforms are concerned with a more robust system of testing, certification, product information and accountability. Contractors will need to retain evidence showing what product information was relied upon and whether the relevant certificates, declarations, data sheets and approvals were current and project-specific.
The fifth is installation evidence. Product compliance does not end with selection. A compliant product may still create exposure if it was installed incorrectly, outside manufacturer requirements, contrary to the specification, or without adequate inspection records.
The sixth is handover and building safety documentation. As regulatory expectations increase, incomplete product information may affect completion, occupation, certification, building safety files, golden thread obligations and later asset management.
The practical message for contractors
The practical lesson is that product decisions should be evidenced as they are made. Contractors should not wait until a defect allegation, compliance review or adjudication to reconstruct product history. By then, the relevant people may have moved on, email trails may be incomplete, product data may be hard to verify, and the commercial context may be disputed.
The stronger position is to maintain clear records of:
the original specification requirements;
employer’s requirements and technical schedules;
contractor’s proposals;
design responsibility matrices;
product data sheets;
declarations of performance and certification;
submittals and approval workflows;
substitution requests;
value engineering proposals;
consultant or employer approvals;
manufacturer guidance;
installation method statements;
inspection and test plans;
photographs of installation;
snagging and defects records;
operation and maintenance information;
handover documentation.
This is not administrative excess. It is evidence of entitlement and responsibility.
Why substitution records are especially important
Substitution is likely to become one of the most important evidential pressure points. A substitution may be commercially sensible. It may reduce delay, avoid supply chain disruption, control cost, or deliver an equivalent technical outcome. But if the substitution route is not properly recorded, it may create later exposure.
The contractor should be able to show:
what the original product requirement was;
why the alternative was proposed;
who proposed it;
what product information was provided;
who reviewed and approved it;
whether the change affected cost, programme, performance or warranty;
whether the contract change procedure was followed;
what was actually installed.
Without that evidence, a practical delivery decision can become a disputed compliance issue.
Why product evidence affects recovery
For Legalbuild clients, the central point is that product evidence is not only defensive. It also affects recovery. If a contractor is seeking payment for changed work, acceleration, delay, disruption, loss and expense or final account entitlement, product records may support the recovery position. They can show that an alternative product was instructed, that design information changed, that approval was delayed, that procurement was affected, or that additional cost arose from employer-led requirements.
Equally, if the contractor is resisting deductions, contra charges, defect allegations or non-payment, product records may be critical to showing that the works complied with the contract or that responsibility sits elsewhere. That is why specification evidence should be treated as part of the commercial record, not merely part of the technical file.
Legalbuild’s view
For Legalbuild, construction product reform reinforces a central principle: the evidential case is built during delivery. Product compliance disputes are often reconstructed long after the relevant decisions were made. At that stage, the project team may no longer be in place, product data may be incomplete, approvals may be ambiguous and the parties may disagree about what was agreed. The stronger commercial position is built earlier.
Contractors should treat specification, approval, substitution and installation records as part of live project governance. They should be captured deliberately, structured clearly and linked to the relevant contract obligations, payment position, change control process and completion requirements. Construction product reform is therefore not only a regulatory development. It is a signal that product decisions will carry increasing commercial weight.
For contractors, the conclusion is clear: where product compliance may later be questioned, the project record must show the chain from specification to approval to installation. Without that chain, the contractor may have a technical answer but not an evidentially recoverable position. Product evidence is becoming more valuable because the market is becoming more accountable. Contractors need records that prove not only what was installed, but why it was contractually and commercially justified.
Source note: This article is based on the government’s Construction Products Reform White Paper, published for consultation in 2026, the accompanying consultation materials and the wider reform programme for construction product safety, accountability and regulatory coverage. The government consultation opened on 25 February 2026 and closes on 20 May 2026.
