The concept of the "golden thread" of building information emerged from the Hackitt Review of Building Regulations and Fire Safety, published in 2018, and was subsequently embedded in the Building Safety Act 2022. In its simplest form, the golden thread is the complete, accurate, and current record of a building's fire and structural safety information — maintained throughout the building's life and accessible to those who need it.
The term has become widely used, and sometimes loosely used. The golden thread is not a folder full of documents. It is not a one-time exercise at handover. It is a discipline of information management applied continuously through a building's design, construction, and occupation. Understanding what the obligation actually requires — and what genuinely usable information looks like — is the starting point for meeting it.
What the Building Safety Act requires
The BSA 2022 places golden thread obligations on different dutyholders at different stages of a building's life. During design and construction of a higher-risk building (HRB), the client, principal designer, and principal contractor each have obligations to create, hold, and pass on the golden thread as the project progresses through the gateways. At Gateway 3 — the point at which the Building Safety Regulator (BSR) approves the building for occupation — the complete golden thread must be handed over to the accountable person.
For occupied HRBs, the accountable person and principal accountable person (PAP) are obliged to hold, maintain, and update the golden thread for as long as the building is in use. The information must be stored in a way that allows it to be accessed and interrogated — not just archived — and must be shared with the BSR on request, with residents who ask for relevant information, and with the fire and rescue service.
What information the golden thread should contain
The content of the golden thread for an occupied HRB is broadly defined in the BSR's guidance, but the core includes: the building's original design intent and as-built drawings, particularly in relation to the fire and structural safety elements; details of any significant changes made to the building, including the basis on which those changes were approved; the current fire risk assessment and any previous versions; the safety case and safety case report; records of fire safety equipment inspection and maintenance; details of the building's fire strategy; and the records required by the Fire Safety (England) Regulations 2022, including fire door inspection records.
For buildings that have been subject to external wall assessment under PAS 9980, the assessment report and any associated investigation records form part of the golden thread. So do records of any remediation works and the confirmation that those works were completed to specification.
Usability is the test that most systems fail
The criterion that the golden thread most commonly fails in practice is not completeness — it is usability. An archive of documents that exists somewhere on a shared drive, that contains the right information in principle, but that takes significant effort to locate and interpret is not an effective golden thread. The BSR guidance expects the information to be kept digitally and securely, accessible to the people who need it — a single source of truth, not an archive.
Usability means different things in different contexts. At 3am on the night of a fire, the fire and rescue service incident commander needs to be able to access accurate information about the building layout, the location of dry risers and firefighting shafts, and the evacuation strategy — quickly, without needing to interpret a dense technical report. In the weeks after a refurbishment, the building manager needs to be able to confirm that the contractor's completion records have been incorporated into the golden thread and that the fire risk assessment has been updated to reflect the changes.
Neither of those use cases is served by an archive of PDFs stored in a generic folder structure. They are served by an information management approach that thinks through who needs what, when, and in what form — and that is actively maintained rather than periodically updated.
The Regulation 38 connection
Regulation 38 of the Building Regulations 2010 requires that fire safety information is handed over to the responsible person when a building is completed or when work is carried out on an existing building that is subject to Building Regulations. The information required under Regulation 38 — fire strategies, as-built drawings, fire protection schedules, and so on — is the starting point for the golden thread at occupation.
In practice, Regulation 38 compliance is often poor. Information is missing, out of date, or delivered in a form that the responsible person cannot use. A new responsible person taking on a building should treat the Regulation 38 handover as the baseline for the golden thread and immediately assess what is missing or needs updating, rather than assuming that the handover package is complete and current.
A Regulation 38 review — an assessment of what information exists, what is missing, and what needs to be obtained or reconstructed — is the logical first step for any responsible person who is unsure of the quality of the information they hold.
Practical steps for keeping the golden thread current
The discipline of maintaining the golden thread is a building management function, not a one-off procurement. Some practical habits that support it: treat any significant maintenance or refurbishment work as a trigger to update relevant records before the contractor leaves site; build a review of the golden thread into the annual cycle alongside the fire risk assessment review; define clearly who in the management team is responsible for maintaining the information; and test usability periodically by actually trying to answer the questions that a fire and rescue service incident commander or a worried resident might ask.
Apex's Regulation 38 review service supports responsible persons in assessing the completeness and usability of their current fire safety information baseline. We can identify gaps, advise on what needs to be obtained or reconstructed, and help put in place the management arrangements to keep information current. The golden thread only earns the name if it is genuinely continuous and genuinely usable.
Common questions
Does the golden thread apply only to higher-risk buildings?
The formal golden thread obligations under the Building Safety Act 2022 apply specifically to higher-risk buildings (those of seven storeys or 18 metres or more with at least two residential units). However, the principle of maintaining accurate and usable fire safety information is good practice for all buildings, and Regulation 38 of the Building Regulations 2010 requires fire safety information to be handed over to the responsible person for a wider class of buildings than just HRBs.
What happens if the golden thread information is incomplete when we take over a building?
This is common, particularly for older buildings. The starting point is to assess what exists and what is missing. Missing information may need to be reconstructed — through investigation of the building, review of planning and building regulations records, or commissioning specialist surveys. A Regulation 38 review can structure that process.