Architect, Contractor, Consultant: Who Does What on a Project

Most disputes on a construction project are not arguments about design. They are arguments about who was supposed to have decided something — and the answer was usually settled, or left unsettled, in the appointment documents months before anybody noticed.

The vocabulary does not help. "Consultant" means different things in different markets. "Architect" is used loosely for anyone producing drawings. And in the Gulf the terminology is layered over practice from several different traditions at once. So it is worth being precise.

The architect

The architect is responsible for the design of the building: what it is, how it is arranged, how it looks, how it performs and how it is put together.

In practical terms that covers interpreting and challenging the brief, developing the design from concept through to technical information, coordinating the design of the other disciplines into a coherent whole, producing the information the building is constructed from, and — where the appointment includes it — observing during construction that what is built reflects what was designed.

What the architect is not responsible for: means and methods of construction, site safety, the contractor's programme and sequencing, or the temporary works required to build. Those belong to the contractor, and blurring that line creates liability confusion in both directions.

The consultant — and the lead consultant

"Consultant" is a category, not a role. On any substantial project there are many: structural engineer, MEP engineer, façade consultant, fire and life safety, vertical transportation, acoustics, landscape, traffic, sustainability, and often more. Each is expert in one domain and responsible for the design of that domain.

The problem this creates is coordination. Every consultant produces a design that is correct in isolation and, unmanaged, incompatible with several of the others. The structural transfer sits where the ductwork needs to run. The façade fixing conflicts with the slab edge. The riser is one riser short.

The lead consultant exists to solve that. This is the party accountable for the whole design across every discipline: coordinating the team, integrating design, technical and statutory inputs, and presenting the client with one accountable point of responsibility rather than a committee.

That role is frequently, though not universally, held by the architect. Where we hold it, we describe it as full coordination of the consultant team, integrating design, technical and statutory inputs under one accountable lead — and the value to the client is a single clear line of accountability across a complex web of disciplines. Our lead consultancy capability is exactly this.

If nobody holds it, the client holds it by default. That is the situation to avoid.

The contractor

The contractor builds. Their responsibility is to construct what the design information describes, to the specified quality, within the agreed time and price — and to take responsibility for how that is achieved: sequencing, methods, temporary works, plant, labour, site safety and subcontractor management.

Contractors also carry design responsibility for specific packages. Façade systems, structural steel connections, lifts, fire suppression and specialist finishes are usually designed by the subcontractor who supplies them, working to a performance specification set by the design team. This is normal and sensible, and it is also where a large share of coordination failures originate, because the interface between the design team's intent and the specialist's solution is easy to leave undefined.

The two common structures

Traditional

The client appoints the design team and, separately, the contractor. The design is substantially complete before construction is priced and awarded.

The client keeps control of the design, and prices are comparable because everyone is pricing the same documented scope. The trade-off is time — design and construction run in sequence — and the client carries the risk of the design information being incomplete.

Design and build

The client appoints a contractor who takes responsibility for both design and construction, usually developing a concept prepared by the client's own design team.

Single-point responsibility and a shorter overall programme are the attractions. The trade-off is control: once the design team is novated to the contractor, decisions that trade quality against cost are made by the party that benefits from the saving. Clients who care about the outcome commonly retain an independent adviser for exactly this reason.

Neither is better in the abstract. What matters is that the client understands which decisions they have given away.

Where accountability actually sits

A useful test: for any given question, ask who owns the answer.

• What should the building be? — the client, advised by the architect
• How should it be arranged and how should it look? — the architect
• Will it stand up, be serviced, be safe? — the relevant specialist consultant
• Do all of those designs work together? — the lead consultant
• How will it be built, in what order, by whom? — the contractor
• Is it on time, on budget and properly governed? — project management
• Is the design being delivered to the quality intended? — design management

The last two are distinct disciplines rather than administrative overhead, which is why we hold design management and project management as capabilities in their own right alongside architectural design.

Common misconceptions

"The architect manages the contractor"

Usually not. The contractual relationship is between client and contractor. The architect administers the contract in some arrangements and inspects the work, but does not direct how the contractor builds.

"The project manager and the lead consultant are the same role"

They are different. Project management governs time, cost, procurement and risk. Lead consultancy owns the coherence of the design across disciplines. Confusing them leaves the design uncoordinated while the programme looks healthy.

"More consultants means better coverage"

More consultants means more interfaces. Coverage improves only if someone is accountable for integrating them.

"Design and build removes risk"

It transfers risk, and transfers control with it. The risk that remains with the client is that the delivered quality is not what was envisaged.

What this means for a client

• Name the lead consultant explicitly in the appointments — do not assume it
• Define which packages carry contractor design, and who reviews them against intent
• Choose traditional or design-and-build deliberately, understanding what you are giving up
• Keep design management and project management distinct
• If nobody is accountable for coordination, you are

Our capabilities cover design, coordination and delivery, and we act as lead consultant where clients want a single accountable point across the team. If you are structuring appointments for a project, start a conversation.