— Notes / Process
Design and construct vs a separate architect and builder.
The difference is the seam. In the separate model an architect designs and a different firm builds, so intent is renegotiated at handover. In design and construct, one entity designs and builds, and the decisions made in drawing are carried through to built form without that handover.
The separate model
The conventional model divides a project between two disciplines. An architect resolves the design; a builder is engaged afterwards to construct it. The work passes from one party to the other across a contractual handover — and it is that handover, not either discipline, that this note is about.
Architects are essential collaborators. Serious architecture demands the rigour an architect brings, and BOWCON builds alongside architects on work that warrants it. The problem is not the design or the construction. The problem is the seam between them.
At the seam, design intent is restated rather than carried. Detailing that was resolved on the drawing is reopened against a construction budget and a programme set by a separate party. Specified material is substituted for something the builder can source or price more easily. Junctions are simplified. Ambition is value-engineered downward in delivery — not by decision, but by attrition, as each compromise is taken in isolation and the cumulative effect on the building is no one's responsibility.
Accountability splits along the same line. When the built result falls short of the design, the architect points to the construction and the builder points to the drawing, and the owner stands between two parties whose interests no longer align. The design is defended on one contract; the cost is defended on another. There is no single point at which the standard of the finished building is owned.
The integrated model
Design and construct resolves both as one process under one entity. The firm that draws the building is the firm that constructs it. There is no second appointment, no point at which the work changes hands, and no separate party to renegotiate the design against during delivery.
This closes the seam. Decisions made in drawing are carried through to built form, because the same firm is responsible for both and the decision does not have to survive a handover to reach the site. Material, detailing and execution are treated as part of the design rather than as a delivery problem to be solved afterward — what can be built, and built to standard, is understood while the design is still being resolved, so the drawing commits only to what the construction will hold.
The result is a single chain of control from the first conversation to handover. The standard set in design is the standard built, because nothing renegotiates it on the way, and the firm that set it is the firm that delivers it.
What changes
Three things change when the seam is removed.
Accountability. One entity is answerable for the design and its construction. There is no line to argue across and no gap between specification and delivery for responsibility to fall into. When the building is measured, it is measured against a single party — which is what makes the standard enforceable rather than aspirational.
Continuity of authorship. The intent set at the outset is carried through by the people who set it, not interpreted by a party who inherited a drawing. Proportion, material and detail are resolved once and held, so the building that is realised is the building that was designed.
Fewer compromises between aspiration and execution. In the separate model, ambition and buildability are negotiated across a contractual divide, and ambition usually loses. Held as one process, they are resolved together and early. The compromises that remain are deliberate decisions made in full view of the whole building, rather than concessions taken in isolation during delivery. What reaches built form is substantial where it should be substantial — in structure, in material, in the detailing felt long after the finish — carried through to built form.
Is the separate model worse than design and construct?
Not inherently, and not because of the architect or the builder. Both disciplines are essential, and a separate architect can produce serious work. The risk sits in the seam between them — the handover where intent is renegotiated by a different party and accountability splits. Design and construct removes that seam by holding both under one entity, which is where its advantage lies.
Where exactly is design intent lost?
At the handover between design and construction. Detailing resolved on the drawing is reopened against a separate builder's budget and programme; specified material is substituted; junctions are simplified; and each compromise is taken in isolation, so the cumulative loss is no one's responsibility. Integrated delivery prevents this because the firm that drew the building is the firm that builds it, and the decision never changes hands.
BOWCON, Adelaide