Buildings do not fail because individual products exist in isolation. They fail because products, systems and people interact. A product can pass every test on the schedule and still contribute to a building that is unsafe, not because the test was wrong, but because no one understood how that certificate related to everything else around it.

Trust in the built environment depends upon confidence that buildings will perform safely throughout their life. Testing plays an essential role in creating that confidence, but as the industry continues to evolve in response to Grenfell and the requirements of the Building Safety Act, it is becoming increasingly clear that testing alone cannot deliver safety. The greater challenge lies in understanding how evidence is interpreted, coordinated and applied across an entire building. 

Testing has always been a cornerstone of construction. It provides a structured way of assessing products, materials and systems against defined performance criteria. Without testing there can be no meaningful evidence that a product is capable of meeting the requirements expected of it. 

Yet there is an important distinction between testing and compliance, and an even more important distinction between compliance and safety. 

For many years, parts of the industry have adopted an approach that focuses heavily on whether individual products comply with specific standards. This remains important. Product testing provides valuable information, supports product selection and creates an essential baseline of evidence for designers, contractors, clients and regulators. However, it is only one part of a much larger picture. 

The performance of a fire door depends not only on the door itself but also on the frame, the seals, the wall construction, the installation quality and the ongoing maintenance regime. The performance of a façade depends not only on the materials selected but on the interfaces between multiple components assembled together on a live construction project. The same principle applies throughout the built environment. Real performance emerges from the interaction between components rather than from any single component alone. 

This represents one of the most significant challenges for technical competency today. A test certificate may demonstrate that a product achieved a particular outcome under specific conditions, but buildings are systems rather than collections of individual products. Competent professionals must therefore understand not only what has been tested, but also what has not been tested, where assumptions have been made and how different elements will interact when brought together in reality. 

The issue extends beyond products and systems. The industry has become increasingly specialised, with design responsibilities distributed across consultants, contractors, subcontractors, manufacturers and specialist suppliers. This fragmentation creates significant challenges when demonstrating compliance. Responsibility for individual decisions may be clearly defined, but responsibility for overall performance can become blurred. 

A previous Technical Competency Panel article explored the importance of clearly defined scopes of service and responsibility matrices, recognising that some of the greatest project risks emerge where responsibilities are assumed rather than explicitly allocated. The same principle applies to testing. Understanding who is responsible for specifying tests, reviewing evidence, coordinating information, assessing limitations and determining overall compliance is just as important as the testing itself. Without clarity of ownership, gaps can emerge between disciplines and organisations, particularly where safety-critical systems cross multiple contractual boundaries. 

The Building Safety Act has accelerated the industry's movement towards a more outcomes-based approach. Increasingly, dutyholders are expected to demonstrate that buildings comply with regulatory requirements and perform safely as complete systems. This requires evidence, but it also requires judgement. Testing becomes valuable not because it generates certificates, but because it contributes to a wider body of evidence that supports informed decision-making and demonstrates that risks have been properly understood and managed. 

This shift in thinking is also reflected in the Government's proposals for reform of the construction products regime. The Construction Products Reform White Paper concluded that the existing system contains significant weaknesses, including fragmented oversight of testing and certification, inconsistent product information, weak traceability and unclear accountability. The proposed reforms seek to create a more transparent and safety-focused framework in which product performance information can be trusted and understood more consistently throughout the supply chain. 

Among the most significant proposals is the move towards more integrated regulatory oversight through the creation of a Single Construction Regulator. While the details continue to develop, the direction of travel is clear. The industry is moving towards a system that places greater emphasis on accountability, evidence and the ability to demonstrate how safety outcomes are achieved. This is precisely the shift the reforms are trying to force. A compliant product does not automatically create a compliant building, just as a collection of test certificates does not automatically demonstrate safety. The challenge for the industry is increasingly one of understanding rather than administration: understanding how products interact, how systems perform, where risks arise and how evidence can be brought together to demonstrate building-level compliance. For many organisations, this will require a significant cultural shift away from viewing compliance as a collection of individual approvals towards understanding compliance as a property of the building as a whole.

Testing therefore needs to evolve alongside the industry. Rather than asking whether an individual product has passed a particular test, the more important question is whether sufficient evidence exists to understand how the building will perform in practice. This places greater importance on system testing, performance verification, interdisciplinary collaboration and the competent interpretation of evidence. It also requires professionals to understand the limitations of testing and to recognise where additional assessment or engineering judgement may be necessary. 

The New London Agenda calls upon the built environment industry to take responsibility, provide clarity and build trust. Testing supports all three objectives when it is viewed as part of a broader process of demonstrating performance. Responsibility requires clear ownership of evidence and decision-making. Clarity depends upon a shared understanding of what is being tested, why it is being tested and how the results should be interpreted. Trust is built when all parties can demonstrate, through robust and coordinated evidence, that a building will perform as intended. 

Ultimately, safer buildings will not be achieved simply by increasing the number of tests undertaken. They will be achieved by developing the competency to understand what those tests mean, how different systems interact and how evidence can be brought together to demonstrate compliance at a building level. The future of testing is therefore not just about products. It is about creating a culture in which evidence, accountability and collaboration combine to deliver buildings that are genuinely safe, resilient and worthy of public trust.