Design & build, traditional tendering or design & construct team — which contract model fits your office investment?

The traditional model

In the traditional model, the client awards design to an architect or design bureau. Only when design and specifications are complete is a contractor or fit-out specialist selected for delivery. Design and realisation are thus separate contracts with separate parties.

This model maximises design freedom and gives the client the clearest role as director: you choose the design, you choose the contractor, and you steer the coordination between them. The risk is that this very coordination becomes the source of delay and additional cost — the architect has finished the design without hearing from the contractor, and the contractor only discovers after award where the design creates construction difficulties.

Suitable for: projects where design quality is decisive, organisations with internal capacity for control, and situations where strategic starting points may still evolve during design.

Design & build

In design & build (D&B), the client awards both design and delivery to a single party or consortium. One point of contact, one price, one schedule. The alignment between design and delivery is resolved internally by the contractor rather than monitored by the client.

The gain: speed, predictability of budget and schedule, and little discussion over responsibility for detailed alignment. The tension: optimisations in design and delivery take place largely within the contractor's interest, and changes during the project become contract variations instead of design discussions. For a more extensive treatment, see design & build for office fit-out.

Suitable for: bounded briefs, proven concepts, organisations that explicitly weight speed and predictability more heavily than optimisation room, and investments where strategic starting points are already firm before contracting.

The design & construct team

In a design & construct team, client, architect and contractor come together early — often during the sketch design phase. The parties work jointly towards a definitive design and execution agreement, with the contractor in an advisory role from the outset.

The design & construct team combines the design freedom of the traditional model with the delivery integration of D&B, but demands the most from the client: more consultation moments, longer preparation, and clarity on how the financial relationship between the parties builds up. In return, the client gets the highest steering capacity on both quality and feasibility.

Suitable for: complex projects with multiple stakeholders, headquarters where symbolism and quality weigh heavily, and investments where the definitive execution form still needs to be sharpened during design — which is regularly the case for larger office transformations.

Comparison against the strategic standard

On four dimensions the models differ materially.

• Control over strategic intent. Highest in traditional and design & construct team, lower in D&B — where intent is fixed upfront and execution optimises within it.
• Speed and predictability. Highest in D&B, average in design & construct team, lowest in traditional.
• Design freedom and change room. Highest in traditional and design & construct team, limited in D&B after contracting.
• Risk distribution. In traditional, the integration risk sits with the client; in D&B, with the contractor; in design & construct team, it is shared via a pre-agreed split.

How the choice falls in practice

In our guidance of boards, the choice between the three models rarely comes up first. First, the strategic direction of the workplace investment must be sharp — what this environment must achieve for the organisation, over what horizon, for which population. Only with that direction in hand does it become visible whether the project calls for speed (D&B), for control (traditional), or for joint development (design & construct team).

For office developments on symbolic locations and for major headquarters renovations, we see the design & construct team fit more often than the market suggests; for bounded expansions and new locations following an existing concept, D&B is usually the logical choice.

We do not design and we do not build, and therefore have no preference for a specific contract model. Our role is to help the board choose — and make the chosen form work strategically rather than letting it determine the strategy.