Building Safety Act · Mandatory · All Phases

Golden Thread Document Register

A register forming part of the golden thread of building information required under the Building Safety Act 2022.

Last reviewed: 29 March 2026 — This guide reflects UK law as of this date. Building Safety Act 2022 remains current with no amendments enacted as of 29 March 2026. Next scheduled review: 29 March 2027.

Legal basis	Building Safety Act 2022 + Higher-Risk Buildings (Keeping and Provision of Information etc.) (England) Regulations 2024
Status	Mandatory — all phases of a higher-risk building's lifecycle
Applies to	Higher-risk buildings: ≥18m or ≥7 storeys + ≥2 residential units in England
Created by	CLIENT establishes framework at project outset; PC and PD contribute during design/construction; PAP receives at handover
CLC guidance	Construction Leadership Council ‘Delivering the Golden Thread’ (August 2024)

1. The Golden Thread — The Building's Permanent Safety Record

The golden thread was conceived in response to the Grenfell Tower fire — where critical information about the building's external wall construction, materials, and modifications was not available to emergency responders, residents, or regulators when it was needed. The Building Safety Act 2022 makes this the central requirement for higher-risk buildings: a structured, digitally-maintained record of the building's safety-critical information, available throughout the building's entire lifecycle.

The Golden Thread Document Register is the master index of this record: it tracks every document that forms part of the golden thread — from Gateway 2 application documents through construction inspection records to the final as-built package handed to the Principal Accountable Person. Without a clear register, the golden thread is a collection of files in different places, at different versions, with no overview of completeness. The register provides the structure that makes the golden thread functional.

The golden thread is a legal obligation, not a best practice — failure to maintain it can result in BSR enforcement action

The Building Safety Act 2022 and associated Regulations impose legally binding duties to create, maintain, and pass on the golden thread. The Building Safety Regulator has enforcement powers including stop notices, compliance notices, and prosecution. As of March 2026, the BSR is actively enforcing these requirements — the golden thread is not optional. Every HRB project team must establish the register and the digital repository from day one of the project.

2. Golden Thread Document Register — Content

The following fields should be recorded for every document included in the golden thread register.

Field	Description
Document ID	Unique reference number in the golden thread register.
Document title	Descriptive title.
Document type	Category: Design / Construction / Fire Safety / Structural / MEP / Safety Case / Operational.
Prepared by	Author (individual and organisation).
Approved by	Approving party (engineer / designer / BSR).
Current version	Version number and date.
Status	Draft / For Review / Approved / Superseded.
BSR / Gateway relevance	Does this document form part of the GW2/GW3 submission? Y/N
Last updated	Date of last update.
Storage location	Digital repository path / CDE location.
Retention requirement	How long retained (HRBs: lifetime of building).
Handover status	Included in PAP handover package? Y/N

3. Common Mistakes

Starting the golden thread after construction begins

The client is required to establish the golden thread framework and electronic format at project outset — before design work starts. The golden thread must be created from Gateway 2, not assembled retrospectively at Gateway 3. A golden thread compiled in the weeks before completion is incomplete, potentially inaccurate, and does not demonstrate continuous record-keeping throughout construction.

Maintaining the golden thread as a collection of files without a register

A folder of PDFs in a shared drive is not a golden thread — it is a collection of documents. The golden thread requires: version control (knowing which version of each document is current); accessibility (the right people can access relevant documents); and completeness (all required information is present). The register provides the framework that makes this possible.

Not updating the golden thread when changes are made during construction

The golden thread must reflect the building as it is actually being built — not the design as originally approved. Every change approved through the change control process must result in corresponding updates to the golden thread documents affected. A golden thread that doesn't reflect changes made during construction is inaccurate.

Not involving the PAP in golden thread planning from the outset

The golden thread ultimately belongs to the PAP in occupation. The PAP should be involved in establishing the format, structure, and digital platform for the golden thread from the project outset — to ensure that what is handed over at Gateway 3 is in a format they can use and maintain throughout the building's life.

Not including all mandatory categories of information

The Higher-Risk Buildings (Keeping and Provision of Information etc.) (England) Regulations 2024 specify the categories of information required. A golden thread that covers some categories but misses others — for example, including structural drawings but not external wall specifications — is non-compliant. The register should map each required category to the documents that satisfy it.

4. Frequently Asked Questions

What is a higher-risk building (HRB) under the Building Safety Act 2022?▾

A higher-risk building is defined as a building in England that is: 18 metres or more in height, OR has 7 or more storeys; AND contains at least 2 residential units. Hospitals and care homes are also higher-risk buildings during the design and construction phase. The building’s height is measured from ground level to the top floor level (excluding roof structures). A building that meets these criteria is subject to the full gateway regime, mandatory occurrence reporting, and the golden thread requirements.

Who is responsible for creating the golden thread?▾

The CLIENT is responsible for establishing the golden thread format and electronic repository at project commencement. The PRINCIPAL DESIGNER is responsible for ensuring the golden thread is created and maintained during the design phase. The PRINCIPAL CONTRACTOR is responsible for maintaining the golden thread during construction — ensuring construction records, test results, and change records are added. At completion, the golden thread is handed to the PRINCIPAL ACCOUNTABLE PERSON.

What digital format should the golden thread use?▾

The Building (Higher-Risk Building Procedures) (England) Regulations 2023 require the golden thread to be held electronically with version control. The specific format is not mandated — it could be a CDE platform, a BIM environment, or a structured document management system. The CLC August 2024 guidance recommends that the format: enables version control; allows access to be managed by role; is accessible to residents and the BSR; and can be maintained and updated throughout the building’s life.

Does the golden thread apply to existing buildings?▾

Yes — for existing HRBs (pre-October 2023 buildings), the golden thread requirements apply to the occupation phase. Existing HRBs were required to register with the BSR by October 2023 and to submit key building information. The Principal Accountable Person must create and maintain the golden thread for the occupation phase, drawing together available information about the building’s construction, fire safety, and structural systems.

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