Chris M.19 August 2026

AI can read the contract. It cannot become the dutyholder

The popular version of this argument is that machines cannot replace human intuition. That is weak, and it is losing. The strong version is legal: UK construction requires a named person to carry the duty, and a model cannot be named.

What were the answers to the previous five questions?

1. Under CDM 2015 and, in England, Part 2A of the Building Regulations, who can hold a dutyholder role, and could that ever be a software system?

Dutyholders are commercial and domestic clients, designers, principal designers, contractors, principal contractors, and workers: identifiable people or organisations, with skills, knowledge, experience and organisational capability requirements attached under CDM, and express competence requirements under Part 2A in England. A software system is none of those things. It cannot be appointed, cannot demonstrate experience, and cannot be held to account.

2. What is the difference between work that AI can perform and responsibility that AI can carry?

Work is the assembling, comparing, extracting and drafting. Responsibility is the acceptance of consequences for a judgement. The first is fully transferable to a machine. The second is not transferable at all, which is why capability and accountability have to be governed separately.

3. Which parts of a project manager's week are genuinely at risk from automation, and which are not?

At risk: the finding, comparing, transcribing and assembling. Not at risk: deciding what a programme movement means, whether an instruction is justified, what to escalate, and carrying the consequences of that. The dividing line is not difficulty. It is whether being wrong creates a liability somebody has to answer for.

4. If a firm automates every routine judgement a graduate used to make by hand, what happens to their ability to catch the machine when it is wrong, and when does that bill arrive?

They lose it, and the bill arrives at the abnormal case, which is the only case they were retained for. Lisanne Bainbridge named this the ironies of automation in 1983: automating routine work removes the human from ordinary practice while still expecting competent intervention when the situation is not routine.

5. Why does an approval button on a screen not necessarily constitute human oversight?

Because oversight requires the reviewer to see the reasoning, the sources, the assumptions and the conflicting information, and to have the authority and competence to disagree. A button records assent. It does not evidence involvement, and where the decision is a significant one about an individual, that distinction now has consequences in law.

What does the statutory framework actually require?

It requires named parties. Under CDM 2015, which applies across Great Britain, commercial and domestic clients, designers, principal designers, contractors, principal contractors and workers each carry defined duties. Regulation 8 requires a designer or contractor appointed to a project to have the skills, knowledge and experience, and if they are an organisation the organisational capability, necessary to fulfil the role, with a matching duty on whoever appoints them to satisfy themselves of it. For building work in England, Part 2A of the Building Regulations 2010, inserted on 1 October 2023, goes further and places an explicit duty on a principal contractor to plan, manage and monitor the building work and coordinate matters relating to it so that it complies with all relevant requirements. Wales, Scotland and Northern Ireland have their own arrangements.

Note the reach, because it matters outside buildings. Part 2A bites on building work as the Building Regulations define it, which on a rail, highway or water scheme means the station or the control building rather than the viaduct, the tunnel or the treatment stream. The duty that reaches all of it is CDM, and its sharpest provision is regulation 8: nobody may accept an appointment as a designer or contractor unless they hold the skills, knowledge, experience and, as an organisation, the capability the work requires, and whoever appoints them must take reasonable steps to satisfy themselves of it. That test can only be applied to a person or a company.

The same architecture recurs wherever consequences are physical. A temporary works coordinator is appointed by name under BS 5975 by a designated individual who is themselves named. A panel engineer under the Reservoirs Act 1975 must be on a specified panel and nobody else may certify. A chartered engineer signing a design answers personally to an institution that can remove their title. None of those appointments can be held by a system.

The direction since Grenfell has been towards more clearly identified accountability, not less. The Building Safety Act 2022 added a gateway regime and a golden thread of information, both of which turn on somebody being answerable for what was decided and why.

Set that beside a technology that can now read every document on a project in an afternoon, and the tension resolves cleanly rather than dramatically. The machine takes the work. The duty stays put.

Four layers of construction work with the accountability line drawn between them. The line has not moved since 2015, and nothing in the current technology moves it.

Does that mean nothing changes for the professions?

No. It means the composition of the roles changes substantially while the roles persist.

Activity	Likely direction	Why
Locating information across systems	Largely removed	Retrieval is exactly what these systems are good at
Comparing revisions and programmes	Largely removed	Structured comparison against a controlled source
Assembling reports and minutes	Substantially reduced	The inputs already exist in the business
Reconstructing project history	Substantially reduced	Contemporaneous records make archaeology unnecessary
Interpreting a contract against facts	Assisted, not removed	The interpretation carries professional liability
Determining a commercial position	Unchanged	A judgement someone must be able to defend
Temporary works coordination and design check	Unchanged	A named appointment under BS 5975, with a check category and a personal signature
Design certification and technical approval	Unchanged	Departures from standard and technical approval are approvals by a named authority, not compliance findings
Dutyholder functions	Unchanged	Statutory, personal, and not delegable to software

This is consistent with the broader evidence. The ILO and NASK index of occupational exposure to generative AI finds around one in four workers in occupations with some exposure and about 3.3 per cent in the highest band, and is explicit that exposure means task transformation rather than job replacement (ILO, 2025). The ONS finds most UK businesses reporting no change to headcount from AI at all (ONS, 2026).

What is the actual risk, if not job losses?

That the person left holding the duty is no longer practised enough to discharge it.

Lisanne Bainbridge set this out in 1983, long before anything resembling a language model existed (Ironies of Automation). Automate the routine, and you remove the human from the ordinary case while still expecting expert intervention in the abnormal one. The more reliable the automation, the less recent the human's experience, and the moment they are needed is precisely the moment they are least ready.

Applied to a graduate quantity surveyor: every difficult clause goes into a model, every awkward email gets redrafted, every long document gets summarised rather than read. Productivity rises immediately. Five years later, the question is whether that person is an exceptional QS equipped with AI, or someone highly capable at operating AI who never built the judgement required to challenge it. Those are very different professionals and only one of them can sign anything.

RICS has taken the same position in regulatory language: members using AI in material professional work must understand its limitations and failure modes, assess reliability, apply professional judgement and maintain oversight. The surveyor's judgement, not the system output, sits at the centre.

How should this change what a firm builds?

It gives you a design rule that is more useful than any policy sentence: before automating a workflow, decide where the human remains and why.

Some activities can be fully automated, because being wrong is cheap and the error is visible immediately.
Some should be assisted, with the professional inside the reasoning rather than receiving its conclusion.
Some should produce a recommendation and stop, requiring an explicit decision.
Some should escalate automatically, because the value or the risk crosses a threshold.
Some should remain untouched, specifically so that the organisation retains people who can still do them.

That last one is counterintuitive and it is deliberate. Preserving a small amount of human effort where a machine could do the job is not inefficiency, it is competence maintenance, and it is the direct answer to Bainbridge. Related: why AI will not replace construction jobs and what an AI admin system actually includes.

A slide widely circulated as IBM internal training material from 1979 put it more briskly: a computer can never be held accountable, therefore a computer must never make a management decision. The original document has never been located in IBM's archive, so treat it as a well travelled aphorism rather than a citation. The reasoning holds regardless of who wrote it.

What five questions should you be able to answer now?

Attempt these before tomorrow. Each has a defensible answer, and each is answered at the top of the next part.

What is the first thing a construction business should build: an AI policy, or something else?
Why should a register record a system and a use case together rather than just naming the tool?
What single question, asked of an employee, reveals the consequence of a given AI use faster than any other?
What should you do with the workarounds people describe during a discovery exercise?
Why does a register that grows over time indicate success rather than deterioration?

Which sources is this part built on?

Every figure quoted above resolves to one of these. Each was checked before publication.