The appeal of design and build is that somebody else carries the design. The cost of it is that
the only description of what you bought is a document you wrote before you knew what you wanted.
On a traditional contract the architect administers the agreement and the employer keeps a design
team answering to them throughout. On design and build the design duty transfers to the contractor,
and in most cases the consultants who prepared the employer’s requirements are novated across
to work for the contractor instead. The people who wrote the description of your building now report
to the party building it. That is a legitimate structure and it works, but it leaves the employer
with nobody on their side of the table unless they appoint one.
What fills the gap is usually optimism. The developer assumes the quantity surveyor is administering
the contract, or that the solicitor who drafted it is still watching it, or that the project manager
has the authority to instruct. None of those are true unless the contract names them, because the
powers in a construction contract belong to the role the contract creates, not to whoever happens to
be in the meeting.
None of what follows requires anybody to behave badly. A contractor who prices the cheapest
compliant answer is doing their job. The structure assumes an informed party on the
employer’s side of the table, and it produces predictable outcomes when that assumption is
wrong.