Contract types for design & build: which fits which type of workplace project?
The choice of contract type determines before the first drawing is made who carries which risk, how the price is formed, and how much steering room the client retains during execution. In practice, this choice is often made late in the project — with considerable consequences for the outcome. This article places the four main forms side by side.
Design & construct team — early collaboration, late price certainty
In a design & construct team agreement, client, designer and contractor collaborate on design and cost estimation before a definitive construction agreement is concluded. Advantages: execution expertise brought in early, integral cost awareness, shared ownership of bottlenecks.
Disadvantages: price is only fixed late, joint decision-making requires discipline, and the contractor may have perverse incentives (soft design that earns during execution). Suitable for clients with strong internal project organisation.
Integrated D&B — consolidated responsibility
Under an integrated design & build contract, one party carries integral responsibility for both design and execution, based on a functional programme of requirements. Advantages: one point of contact, design and execution faults in one hand, fixed price at the end of design.
Disadvantages: the client must formulate the functional result sharply in advance; interim changes are expensive. With a sharp programme of requirements, this is a strong form; with a vague starting position, it goes wrong.
Turnkey — end result at agreed price
Turnkey contractors offer a fully delivered workplace based on a standardised or semi-standardised offering. Advantages: speed, price certainty, one point of contact for both design and construction.
Disadvantages: standardisation can conflict with strategic identity; deviations from the standard offering are expensive; the incentive to deliver quality does not always sit where the client thinks. For the extensive analysis, see turnkey office pitfalls.
Integrated D&B — the hybrid form
An integrated design & build contract combines elements of integrated contracting and turnkey, with more customisation than a standard turnkey. A D&B partner handles design, technical elaboration and execution under one roof, often with own specialists and standardised processes.
Advantages: speed, integral cost awareness, scale advantages at larger D&B parties. Disadvantages: design freedom is more limited than with open architect selection. Extensive discussion is in design & build vs. traditional and managing a D&B partner.
The choice is rarely technical, usually organisational
Which form fits depends mainly on two things: how sharp is the client in its programme of requirements, and how large is the internal project organisation. An organisation with a sharp PQR and strong project organisation can handle any form; an organisation with a vague PQR and small project organisation should move towards turnkey or D&B with a strong partner.
The choice itself is a strategic decision with multi-year financial consequences — not a technicality to be delegated to procurement.
Frequently asked questions
What is common in the Netherlands for corporate workplace projects?
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For projects <€5M: turnkey or integrated D&B is dominant. €5–€20M: D&B or integrated contract. >€20M: more often integrated contract or design & construct team, sometimes traditional with separate architect and contractor.
When does traditional (separate contractor) still fit?
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Mainly for high architectural ambition where the architect co-designs into execution detail. For standard corporate workplace projects, this has largely been abandoned in favour of integrated forms.
Who carries the risk for additional work?
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Design & construct team: shared. Integrated contract: contractor, unless scope change by client. Turnkey: client for every deviation from standard. D&B: usually contractor for execution additional work, client for scope change.
When does the price become fixed?
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Design & construct team: at end of definitive design. Integrated contract: at contract signing. Turnkey/D&B: at quotation. The earlier fixed, the less flexibility; the later fixed, the more financial risk during design.
Design & build, traditional tendering or design & construct team — which contract model fits your office investment?
The three common contract models for office fit-out differ not primarily in price, but in where strategic control sits. A plain overview for boards.
Managing a design & build partner: how a board retains strategic control
Contracting a D&B partner is half the work. The other half is preventing strategic control from gradually shifting from the board to the contractor.
Turnkey office: three strategic pitfalls a board can prevent
Turnkey, one-stop-shop and integrated contract are variants of the same idea: one party handles everything. Attractive, until you see which decisions invisibly shift.
Programme of requirements for an office: what a board needs to make explicit before it goes to the architect
A programme of requirements is often filled in technically while the strategic anchoring is missing. Which parts determine whether the brief points in the right direction?