Since 1 October 2023, the golden thread is a legal duty

Two years. That is the maximum prison sentence for failing to hand over the golden thread of building information to a new accountable person, and it sits in the Building Safety Act 2022 alongside an unlimited fine. If you manage a portfolio that includes any building of 18 metres or seven storeys with at least two residential units, that exposure now belongs to whoever signs off the handover.

The duty has been live since 1 October 2023, so the first wave of transfers, refurbishments and enforcement conversations is already underway. What the Building Safety Regulator asks for is not a folder of PDFs. It is a digital record that a stranger could pick up and use.

The golden thread is a legal duty, not a filing habit

Section 88 of the Building Safety Act 2022 creates the duty to provide information, and the substantive obligation came into force on 1 October 2023. The Building Safety Regulator sets out the purpose plainly: those responsible for a higher-risk building must retain a golden thread of information so that dutyholders can identify, understand, manage and mitigate building safety risks throughout the building's life-cycle. The thread is the evidence that the completed building, and any later work on it, meets applicable building regulations.

During design and construction, the client, principal designer and principal contractor hold the duty to keep and manage that information. Once the building is occupied, responsibility passes to the Accountable Person, with a Principal Accountable Person taking lead where more than one AP exists. An AP is the individual or organisation holding a legal estate in possession of the common parts, or carrying a repairing obligation for them. Where the AP cannot find the information, the regulator expects a justification for why.

The Construction Leadership Council published Delivering the Golden Thread: Guidance for dutyholders and accountable persons on 27 August 2024, and the technical guidance behind it is the document your consultants should already be working to.

What the regulator actually inspects

Schedule 1 of the Higher-Risk Buildings (Keeping and Provision of Information, etc.) (England) Regulations 2024 sets out exactly what must be included in the thread. The regulator does not assess your intentions. It assesses whether the right people have the right information at the right time, which is the test the official guidance applies.

In practice, that means six characteristics have to hold. The information must be kept digitally, kept securely, treated as the building's single source of truth, available to the people who need it to do their job, available at the moment they need it, and presented in a form they can actually use. A scanned O&M manual sitting on a shared drive fails at least three of those tests, because it is neither searchable, nor current, nor tied to the specific asset it describes.

The golden thread has two parts: building work, and maintenance. The thread must be created before building work starts and updated throughout design and construction. When work completes, it is handed to the Accountable Person for the occupied building. Each thread is bespoke to its building and its residents, which is why a template approach tends to collapse the first time a fire door is replaced.

Where portfolios lose the thread

Most portfolio managers I speak to are not short of information. They are short of one place where the information agrees with itself. The fire risk assessment says one thing about a compartmentation defect, the contractor's close-out pack says another, and the insurer's schedule says a third. When the Building Safety Regulator or a fire and rescue authority asks which version is correct, the honest answer is usually that nobody has reconciled them.

Refurbishment is where this bites hardest. A building being upgraded while still occupied involves dutyholders, the PAP and the APs all at once, and the thread has to survive the transition from construction-phase records to occupation-phase records without a gap. Where the building already exists, APs are expected to make reasonable enquiries to find the information needed to assess fire spread and structural stability risks. Reasonable enquiries is a higher bar than a phone call to the previous managing agent.

For a portfolio manager answering for performance across many buildings, the practical question is whether each building's thread can be produced on demand, in a form a regulator can follow, without a week of email archaeology. If the answer depends on which surveyor is still with the business, the control is not real.

What a breach looks like on the record

The Building Safety Act 2022 is described as the most significant overhaul of building and fire safety legislation in England in fifty years, and the enforcement architecture matches that description. A breach of the golden thread requirements can result in criminal liability. Failure to transfer the thread to a new accountable person or principal accountable person can lead to prosecution, a fine and up to two years' imprisonment, or both.

That is the tail risk. The more common outcome is slower and more expensive: the regulator asks for information you cannot produce, the enquiry escalates, and the remediation programme stalls while the evidence is reconstructed. Insurers price that uncertainty into renewals, and buyers price it into transactions. The regulator's own guidance on understanding the golden thread is worth reading in full before your next board pack, because it is the standard your evidence will be measured against.

If you want the detail on what the regulations require from your systems, the Fire Safety Event's breakdown of what the Building Safety Act's golden thread really requires is a useful second read. For the duties that sit with owners specifically, Paris Smith's summary of golden thread duties for property owners covers the AP and PAP definitions clearly.

Your 60-second self-check

• Could you produce the current golden thread for every higher-risk building in your portfolio today, in a form a regulator could follow without your help?
• For each building, is there a named Accountable Person and, where required, a Principal Accountable Person, and do they know which records they own?
• Has any building in your portfolio changed hands, been refurbished, or changed managing agent since 1 October 2023 without a documented handover of the thread?

If you cannot answer all three with confidence, you are carrying a control gap you may not be able to see from the centre. The free 5-minute Director's Risk Check gives you a control score for your portfolio before someone more senior asks for one, and it can be sent to a colleague to complete if the records sit with them.

Herman's verdict

A golden thread that only exists in the head of the person who built it is not a thread at all, and the regulator will not accept your assurance that it is somewhere. Build the record so that a stranger could run the building from it, because one day a stranger will have to.

— Herman