Scope note. This guide summarises the current England regime for higher-risk building work and the practical evidence implications for facade packages. It is not legal advice and does not replace the client, Principal Designer, Principal Contractor, fire engineer or Building Safety Regulator.
The Building Safety Act 2022 and the higher-risk building control regime have made evidence part of the design deliverable. A compliant-looking detail is not enough on its own: the project team needs to show what was designed, which products and systems the design relies on, how interfaces and changes were controlled, and how the completed work relates back to the approved information.
Which buildings are in the higher-risk regime?
For building-control approval in England, a higher-risk building is generally at least 18 metres high or at least seven storeys and contains at least two residential units, or is a hospital or care home within the relevant construction-stage definition. The occupied-building registration duties are not identical in every respect, so the exact building type and work must be checked at project level. The current definition and exclusions should always be confirmed against official guidance before a submission strategy is fixed.
The gateway sequence from the envelope’s perspective
Planning and early design
Fire safety must be considered early enough to influence the building rather than being added after the envelope has been divided into packages. The facade team should establish the proposed external-wall build-ups, cavity strategy, primary interfaces and design responsibilities, while recording what remains to be verified. Early records make later design decisions easier to explain and prevent tender assumptions from being mistaken for approved design.
Building control approval before higher-risk work starts
Building work that requires Building Safety Regulator approval must not start until the relevant application or approved stage permits it. The application needs enough coordinated information to demonstrate how the work will comply with the Building Regulations. For an envelope package this normally means more than a product list. The evidence route should connect the drawings, specifications, calculations, fire strategy, product data, interfaces, responsibilities and design-change process.
A useful facade evidence schedule identifies each system and location, the controlled drawing or detail, the product and configuration, the evidence relied upon, its revision and date, and the person responsible for closing any gap. Structural, thermal, condensation, fire, weathering and movement requirements should be traced to the drawings and calculations that address them. If a design choice is still open, it should be shown as open rather than presented as complete.
Completion and the as-built record
When higher-risk building work is complete, a completion-certificate application is required. The final record needs to show the completed work and the controlled changes made after approval. Envelope evidence commonly includes as-built drawings, approved product information, inspection and test records, photographic records of concealed work, delivery or batch evidence where required, completed check sheets and a reconciled change log.
A photograph is useful only when its project, location, date and subject are identifiable. A technical submittal is useful only when the installed product and configuration fall within its application. A drawing register is useful only when the current revision can be distinguished from superseded information. The quality of the links between records matters as much as the number of files collected.
The golden thread is controlled information, not a folder name
The golden thread should allow an authorised person to find reliable, current information and understand how it changed. In practical facade control, that means using stable document identities, revisions and statuses; separating work in progress from checked, approved and as-built information; retaining the reason and authority for changes; and keeping the relationship between system evidence and its project application visible.
Three recurring risks deserve particular attention:
- Evidence without applicability: a certificate or test report exists, but the project build-up, void, substrate, span, fixing or orientation sits outside the evidence.
- Substitution without re-checking: a membrane, insulation, fixing, bracket or panel changes during procurement without the affected fire, structural, thermal, weathering and interface checks being reopened.
- Unowned interfaces: the roofing, cladding, glazing, SFS, fire-stopping or structure packages meet at a junction that no one has been appointed to coordinate.
What a controlled envelope evidence pack should contain
The exact contents depend on the appointment and building, but a practical pack may include:
- a responsibility and design-deliverables matrix;
- controlled drawing, specification, calculation and technical-submittal registers;
- system build-ups tied to locations and interface details;
- product evidence with revision, date, configuration and application limits;
- structural, thermal, condensation, fire and weathering design evidence where applicable;
- an RFI, assumption, departure and change-control record;
- installation inspection, photographic and non-conformance records; and
- a reconciled completion or as-built index showing what has been superseded.
The pack should not claim approval simply because a file has been uploaded or issued. Approval, acceptance, completion and client instruction are separate states and should be recorded only against the evidence and authority that create them.
Design and installation have different evidence roles
ALM Complete Design supports the design and evidence side: defining the facade package, coordinating information, preparing calculations and drawings, reviewing system evidence and structuring responses for design-team or building-control review. ALM Facades supports the delivery side: installing the controlled systems, recording inspections and concealed work, and returning installation evidence for the project record.
Keeping those roles connected reduces gaps, but it does not remove the need for independent checking, project dutyholders or formal approval. The evidence should always state who produced it, who checked it, what it applies to and what remains outside its scope.
Where to start
Start with one controlled register rather than a late document dump. List the envelope systems and interfaces, bind each to its source information, identify missing or conflicting evidence, and assign the next check. Revisit that register whenever geometry, loads, substrate, build-up, fire strategy, movement, manufacturer or installation method changes.
For a closer look at the service, see Building Safety Act facade evidence. For procurement sequencing, read Gateway 2 and envelope procurement. For maintaining reliable records after handover, see Lifecycle Care.