The golden thread: the evidence trail behind every safe building
The golden thread is the record that proves a building is what it claims to be. Introduced by the Building Safety Act 2022, it’s the structured, digital, transferable information that follows a higher-risk building through its whole life – from design intent to as-built reality to every change made afterwards. For passive fire protection, it’s the difference between a compartmentation system you’ve installed and one you can prove works.
Ark builds the golden thread as the work goes in. Every fire stop, fire door, cavity barrier and coating is captured at the point of installation, so the evidence trail is complete and structured from day one – not reconstructed under pressure at handover.
What is the golden thread?
The golden thread is the information management requirement at the heart of the Building Safety Act. It’s not a document or a folder – it’s a live, structured record of a building’s safety-critical information, held digitally, kept up to date, and transferable to whoever becomes responsible for the building next. It has to be accurate, accessible, and maintained across the building’s lifecycle.
It sits alongside – but is distinct from – the Building Safety Regulator. The BSR is the regulatory front door a building has to pass through at each Gateway; the golden thread is the evidence you bring to it and keep long after. One is the checkpoint; the other is the record.
What the golden thread must contain for passive fire protection
Passive fire protection is one of the largest and most detailed parts of the golden thread, because it’s made up of thousands of individual installations that each have to be evidenced. For every element, the record should hold:
- The product and batch installed, with its data sheet.
- The tested system it matches – proof the installation replicates a configuration that passed a fire test.
- The competence record of the person who installed it.
- A photograph of the completed installation.
- Its precise location in the building.
- The date and a sign-off.
- And, through life, its inspection and maintenance history.
Without that record – however well the work was done – the protection can’t be demonstrated, and under the Building Safety Act an installation that can’t be evidenced is treated as one that can’t be relied on.
The golden thread, stage by stage
The golden thread isn’t created at handover – it’s built continuously. Here’s how it comes together on an Ark project:
1. Survey and design
The record starts with what’s specified: the fire strategy, the tested systems selected, and – on remediation – an intrusive survey of what’s actually in the building today.
2. Capture at installation
As each element goes in, it’s logged in real time – product, tested system, installer, photograph, location – before it’s covered by finishes. This is the step that fails most often on other projects, and it can’t be recovered after the fact.
3. Sign-off and quality control
Each record is checked and signed off against the tested system, so the golden thread reflects a controlled installation, not an assumption.
4. Handover
At completion, the structured record transfers to the Principal Contractor, Principal Designer or Accountable Person – in the format the Gateway 3 submission and the building’s safety case need.
5. Through life
The golden thread is a living record. Inspections, maintenance and any future alterations are logged against it, so it stays accurate for the lifetime of the building – and for the next person who becomes responsible for it.
How Ark builds the golden thread
Ark builds the golden thread through Onetrace, the platform behind every project we deliver. It captures each installation as structured digital data at the point of work – not notes to be typed up later – and produces a searchable, transferable record that maps directly to what the Building Safety Regulator, a FRAEW assessor, an insurer or a future owner will ask for. The evidence pack is treated as a deliverable in its own right, not a by-product of the job.
Who needs the golden thread?
- Accountable Persons – for occupied higher-risk buildings, the Accountable Person must hold and maintain the golden thread and produce a safety case. Passive fire evidence is a major part of it.
- Principal Contractors and Principal Designers – on new builds, dutyholders under the Building Safety Act need the golden thread to satisfy Gateway 2 and Gateway 3.
- Building owners, landlords and asset managers – the golden thread underpins refinancing, sale, insurance and warranty – and is increasingly what a buyer’s due diligence asks for.
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FAQs
What is the golden thread in construction?
The golden thread is the structured, digital, transferable record of a building’s safety-critical information, required under the Building Safety Act 2022. It covers design and construction information for higher-risk buildings, is kept up to date across the building’s life, and passes to whoever becomes responsible for the building next.
What does the golden thread have to contain for passive fire protection?
For each element – fire stopping, fire doors, cavity barriers, coatings – it should hold the product and batch, the tested system reference, the installer’s competence record, a photograph, the location, the date, a sign-off, and the ongoing inspection history. Together these prove the installation can be relied on.
Is the golden thread the same as the Building Safety Regulator?
No. The Building Safety Regulator is the body that reviews and approves higher-risk buildings at the Gateways. The golden thread is the evidence record you present to it and maintain afterwards. The regulator is the checkpoint; the golden thread is the proof.
When does the golden thread need to be created?
From the start, and continuously. It begins at design, is captured as each element is installed, transfers at handover, and is maintained through the building’s life. It can’t be reliably reconstructed after the fact, which is why capturing evidence at the point of installation matters.
How does Ark create golden-thread evidence?
Through Onetrace. Every passive fire installation is logged in real time – product, tested system, installer, photograph, location and sign-off – producing a structured, transferable record that maps to Gateway submissions and the building’s safety case. The evidence pack is a deliverable, not an afterthought.
Who is responsible for maintaining the golden thread?
For occupied higher-risk buildings, the Accountable Person. During design and construction, the dutyholders – the Principal Designer and Principal Contractor. Ark provides the passive fire portion of the record in a form these dutyholders can hold and maintain.