Understanding the Building Safety Act and Cladding Requirements
The Building Safety Act has changed how cladding is designed, specified, installed, inspected and maintained across the UK. Its impact extends beyond the choice of an external material. Developers, architects, contractors and building owners must now demonstrate that the complete wall system is safe, properly documented and managed by competent organisations.
For projects involving higher-risk buildings, the expectations are particularly demanding. Design information must be sufficiently developed before construction begins, significant changes must be controlled, and records must remain available throughout the building’s life. These requirements make early coordination between the facade, structural, fire safety and building services teams essential.
The Act also places greater emphasis on accountability. A compliant product alone does not make a compliant facade. The substrate, cavity barriers, fixings, insulation, interfaces, workmanship and maintenance strategy must work together as a verified system. This is why specialist envelope expertise has become increasingly important when planning cladding remediation or new-build construction.
What the Building Safety Act Changes
The Building Safety Act 2022 introduced a stronger regulatory framework for building safety, with particular attention on higher-risk buildings in England. During design and construction, higher-risk buildings generally include residential buildings at least 18 metres high or with at least seven storeys and two residential units. Certain hospitals and care homes also fall within the higher-risk category, subject to the relevant definitions and regulations.
The Act created a more structured approval process for these projects. The principal gateways require information to be submitted at key stages, including before construction starts and before the building is occupied. Building control approval is no longer treated as a routine administrative step that can be resolved while work progresses. Designs must be coordinated, technically justified and sufficiently complete at the appropriate stage.
The legislation does not prohibit every form of combustible cladding, nor does it prescribe one universal facade solution. Instead, it increases the responsibility on project teams to prove that their chosen construction meets the applicable fire safety and building regulation requirements. The full external wall build-up, rather than an isolated panel, is the focus of effective compliance.
Responsibility Across the Project Team
The new regime identifies dutyholders with defined responsibilities. These include the client, principal designer and principal contractor, with duties to plan, manage, monitor and coordinate work. Each party must have the competence, organisational capability and resources needed for its role. Delegating a task does not remove the need for proper oversight.
For cladding projects, this means responsibility must be clear across design development, procurement, installation and inspection. A facade subcontractor may provide specialist design input, but the principal designer and principal contractor still need to understand how that input fits into the overall building strategy. Interfaces with windows, balconies, roofs, fire stopping, structure and building services require particular care.
Competence is assessed through demonstrable knowledge, skills, experience and behaviours rather than a general claim of expertise. Evidence may include relevant project history, technical procedures, trained personnel, quality systems and independent certifications. Information about industry accreditations can help clients and design teams assess whether a contractor has suitable systems for complex envelope work.
Design Decisions and Facade Interfaces
The Act encourages design teams to resolve technical matters earlier. Cladding layouts, support systems, insulation, cavity barriers, compartmentation and fire stopping should be coordinated before procurement and installation. Late changes can affect fire performance, structural capacity, condensation risk, weather resistance and the information required for gateway submissions.
Movement and interfaces deserve close attention. Expansion joints, deflection zones and changes in the concrete frame can alter panel support, cavity continuity and fire barrier performance. Detailing cladding around expansion joints should account for movement, tolerances, fixings, seals and the continuity of the fire and weather barriers.
A robust facade specification should describe the complete tested or assessed build-up, including fixing patterns and acceptable substitutions. Replacing a panel, insulation product or support rail with an apparently similar alternative may invalidate the evidence supporting the original design. Material substitutions should therefore pass through formal technical review and change control, rather than being agreed informally on site.
| Project consideration | Implication for cladding work | Evidence typically required |
|---|---|---|
| Building classification | Higher-risk status may trigger gateway and registration requirements | Building height, storeys, use and regulatory assessment |
| External wall fire performance | The complete wall build-up must be considered | Test reports, classification documents or suitable assessments |
| Dutyholder competence | Roles and responsibilities must be assigned and managed | Competence records, organisational procedures and project experience |
| Design changes | Substitutions and site variations need formal review | Revision history, approvals, technical assessments and inspections |
| Golden thread | Safety information must remain accurate and accessible | Coordinated drawings, specifications, product records and handover data |
| Occupation and maintenance | Building owners need information to manage ongoing risk | Fire strategy, inspection guidance, repair details and asset records |
Fire Testing and the Golden Thread
Fire performance evidence should relate as closely as possible to the proposed construction. BS 8414 testing can be relevant to certain non-loadbearing external wall systems, with results assessed under the applicable classification framework. However, a test report should not be treated as a general certificate for every facade arrangement. Differences in height, substrate, cavity barriers, insulation, fixings or cladding panels can be significant.
Project teams should understand the scope and limitations of each report or assessment. Guidance on the BS 8414 fire test standard can help explain how large-scale facade testing fits within the wider approach to fire safety evidence. The appropriate route may depend on the building type, wall construction, materials and current regulatory requirements.
The golden thread is the controlled body of information that supports safe design, construction and occupation. For cladding, it may include approved drawings, product data sheets, reaction-to-fire classifications, test reports, installation records, cavity barrier locations, photographs, inspection results and approved changes. Information should be consistent across drawings, specifications, digital models and handover documents.
A golden thread is useful only when it is maintained. Records created at tender stage must be updated when the installed facade differs from the design. Building owners also need practical information about access, cleaning, inspection, repair and future replacement. This creates a direct link between construction quality and long-term building management.
Commercial and Delivery Implications
The Act can influence cost, programme and procurement strategy. More detailed design information may be required before work begins, while specialist reviews, fire engineering input, surveys and inspections can add fees. These activities are generally less disruptive when planned early than when discovered after materials have been ordered or facade installation has started.
Procurement based solely on the lowest initial price creates additional risk. A lower-cost product may require different support arrangements, lack suitable evidence for the intended build-up or create complications at interfaces. Employers’ requirements and subcontract scopes should define the required performance, documentation, design responsibility, inspection points and change approval process.
Existing buildings bring a different set of issues. Owners may need to investigate original construction records, intrusive survey findings, previous alterations and the current condition of panels, insulation and cavity barriers. Remediation decisions should be based on a proportionate risk assessment and verified technical information, rather than replacing materials without understanding the underlying wall system.
The Act also strengthens the importance of handover. A project is not fully successful if the completed facade cannot be inspected, maintained or safely altered. Clear asset information helps future owners, facilities teams and contractors understand what has been installed and which replacement products or repair methods are appropriate.
Practical Steps for Project Teams
A structured approach can reduce uncertainty and support better decisions from concept design through to handover. Developers and main contractors should involve a specialist envelope contractor early enough to review buildability, performance evidence and interfaces before the facade package is fixed.
Architects and clients should also ensure that responsibility for each design element is visible. A responsibility matrix can identify who produces drawings, who verifies calculations, who approves product substitutions and who records installation evidence. This reduces gaps between the architectural, structural, fire and construction teams.
Useful actions include:
- Confirm whether the building falls within the higher-risk building regime and identify the relevant approval route.
- Define the facade build-up in full, including panels, rails, insulation, membranes, cavity barriers, fixings and interfaces.
- Check that fire performance evidence relates to the proposed system and record its limitations.
- Establish a formal process for design changes, substitutions, inspections, non-conformances and photographic records.
- Prepare golden thread and handover information as the work progresses rather than attempting to recreate it at the end.
These steps should be supported by regular technical reviews and clear communication between all dutyholders. Inspection and test plans can identify hold points for cavity barriers, support systems, fixings, sealants and completed facade areas before they become inaccessible.
For property owners, planned maintenance should include periodic inspections of cladding panels, joints, fixings, sealants, flashings and drainage paths. Any repair or alteration should be assessed against the original design and fire strategy. Keeping accurate records helps preserve the building’s safety information and reduces uncertainty during future works.
Bak Cladding Solutions provides integrated cladding, roofing and architectural glazing services for developers, architects, contractors and property owners. Its technical team can support material specification, facade coordination, installation and project handover across complex building envelope packages.
Early involvement can help align the design, fire performance evidence, construction details and project records before work reaches site. Contact Bak Cladding Solutions to discuss a compliant, coordinated approach to cladding and wider envelope requirements for your project.