Golden-Thread Duties by Trade: Who Evidences What

The email goes to everyone at once. The principal contractor has attached a single golden-thread schedule and sent it to the facade package, the fire-stopping subcontractor, the structural steelwork contractor and the M&E lead, with one deadline and no explanation of which rows belong to whom. By the afternoon, four commercial managers are asking the same question: how much of this is actually ours?

What's Actually Being Asked

The golden thread is not divided up by trade. Under the Building Safety Act and the Building Regulations regime that came with it, the named duties for a higher-risk building in England (broadly, at least 18 metres or seven storeys with two or more residential units, with care homes and hospitals at that height also in scope during design and construction) sit with the client, the principal designer and the principal contractor. Through design and construction they are the ones who have to hold the information and produce it when the regulator asks, and at handover it passes to the accountable person who has to keep it current in occupation.

That does not leave the rest of the chain out of it. The dutyholder and competence regime in the Building Regulations places duties on every designer and every contractor, whatever the size of the package: to work only within the limits of their own competence, to cooperate with the other dutyholders, and to provide the information the people carrying the named duties need in order to discharge them. Those competence and cooperation duties are not limited to higher-risk buildings. They apply to building work generally, which is why the same schedule now turns up on projects nowhere near the height threshold.

So nobody hands a specialist their own golden thread to keep. They feed one. What is provided has to be accurate, has to survive being stored and handed on in the electronic form the golden thread requires on a higher-risk building, and has to still make sense to someone who was not in the room. What changes from trade to trade is not the duty. It is the evidence that satisfies it, because each package answers a different question about the building.

The Evidence That Answers It

Four packages, four different lists. It is worth being specific about them, because the fastest way to produce a weak submission is to answer a generic schedule generically.

Facade and envelope

The question this package answers is whether the wall performs as designed, and whether what is on the building matches what was approved.

• Approved system design and as-built details, with the difference between them visible where the two diverge.
• Performance test evidence for the system as specified, including the weathertightness and structural testing the specification calls for.
• Fire performance evidence for the system and its components, including insulation, cavity barriers and the interfaces where the wall meets compartment lines.
• Manufacturer performance documentation for the products actually fitted, including the declaration of performance where the product carries one, following any substitution rather than the original specification.
• Installation and inspection records tied to a grid reference and a level, and to the operative or gang who carried out the work, not to a week in the programme.

Fire protection and fire-stopping

Here the question is whether every penetration and junction was formed the way the tested system requires. It is also the package whose work is concealed within days by the trade that follows, so the record made at the time is the only thing left to inspect.

• The tested system or assessment referenced for each detail, with the evidence behind it.
• The specific products used at each location, with the manufacturer performance documentation that covers them.
• A record per penetration: location, service passing through, photographs before and after closure, date, and who did it.
• Any deviation from the tested detail, with the assessment or approval that permitted it.
• Installer competence, including third-party certification of the operative where the specification requires it, valid on the date of the work.
• A live register of which penetrations are closed and which remain open, because the outstanding ones are what an inspection is most likely to go looking for.

Structural

The question is whether the frame was built as designed, and whether the material in it was what was specified.

• Approved fabrication and erection information set against the as-built condition.
• Material traceability, linking certificates to the members actually installed.
• Welding procedure and welder qualification records to the execution specification, valid on the dates the welds were made.
• Connection inspection records, survey and setting-out data.
• Every design change and its approval, including temporary works, and the reasoning behind each one.

Mechanical and electrical

The question is whether the systems people will depend on actually work, and whether the building can be kept working after handover.

• As-installed schematics and equipment schedules, not the tender versions.
• Equipment and containment located to riser, plant room and floor, so a result can be traced back to the thing it was taken from.
• Product and certification evidence for life-safety systems.
• Commissioning and test results tied to the equipment they came from, with the fire-safety critical systems separated out rather than buried in a general commissioning pack.
• Every change to the installed arrangement, with who approved it and when.
• Operation and maintenance information the accountable person can actually run the building on.
• Competence evidence for the disciplines where the specification or the scheme requires it.

Four lists, one shape underneath: what was installed, where, to what specification, by whom, tested how, and changed when. Every trade is answering those six questions. Only the nouns change.

Why the Spreadsheet Version Fails

Each trade builds its answer separately, in its own format, at the end. The facade package arrives as a folder tree, the fire-stopping evidence as a photo dump with filenames nobody can decode, the structural records as certificates in a PDF binder and the M&E as a commissioning pack with its own numbering. The principal contractor then has to assemble four differently shaped submissions into one coherent account of a building, and the interfaces, which is exactly where the risk lives, fall between them. Nobody owns the junction between the cavity barrier and the compartment wall, or between the service penetration and the structure it passes through, because it sits at the edge of two packages and in the middle of neither. Worse, a record compiled at the end can assert what happened, but it cannot show when it was captured or that it describes the building as it stands. That distinction matters more than it used to, because for claims about defective dwellings the Building Safety Act pushed the limitation window far beyond the six years the industry planned around.

Keeping It Provable

The common denominator across all four packages is not the document type. It is location. Every one of those records is a statement about a specific part of a specific building: this panel, this penetration, this connection, this riser. When the record is built as the work happens and anchored to the part of the building it describes, the four packages line up without anyone translating between them, and the interfaces stop being nobody's. The test is the same whatever the package covers: if the job stopped today, could the business say what has been built so far, where, and by whom, without asking anyone to remember anything? A record that passes that test mid-job is a record that passes it at handover.

The Monday Checklist

1. Take the schedule you have been sent and mark each row as yours, someone else's, or shared. The shared rows are the ones to raise this week, not at handover.
2. Write down the one question your package exists to answer about the building. Everything you are asked to evidence should serve it; anything that does not is worth challenging.
3. Name the interfaces where your package meets another trade, and agree in writing who records what at each one.
4. Check that your product evidence follows what was actually installed, including every substitution made on site.
5. Sample five records from the last month and see whether each one tells you the location, the date and the person. If it does not, it is a file, not evidence.
6. Check competence records against the dates the work was done, not against today, and note the gaps while there is still time to close them.
7. Ask the principal contractor what format the information has to arrive in, and ask now rather than in the final month.

Where BrieXO Fits

BrieXO's FIELD bundle keeps daily site records, inspection and QA workflows, photo evidence, competence records and recorded decisions in one living record, anchored to the building, so the site-side evidence accumulates as the work happens instead of being reconstructed at the end. Design and commercial modules are on the roadmap. It supports your golden-thread duties; it doesn't discharge them. How that record is built on an envelope package sits on our facade contractors page.

Related reading:the specialist contractor's guide to the golden thread, the evidence Gateway 2 asks subcontractors for, and the as-built record at Gateway 3.

George Sfica is a senior design manager at a specialist façade contractor, with 23 years in manufacturing and construction, eleven of them in façades and external envelopes, spanning fabrication, installation and design management, an MSc in Façade Engineering and an IFE Level 2 Certificate in Passive Fire Protection. He is the founder of BrieXO.