Design and build is a term describing the
procurement route in which the main contractor is appointed to design and construct
the works, as opposed to a traditional contract, where the client appoints
consultants to design the development and then a contractor is appointed to
construct the works.
The contractor can be appointed to carry out all
the design work, or if the client wants to have greater influence over the
design, a concept design can be prepared by a consultant employed by the
client, and then the contractor is appointed to complete the design and carry
out the construction.
The contractor can use their own in-house designers
to design the building, or they can appoint consultant designers, or the
client's designers can be employed by the contractor to complete the design
(either by novation or consultant switch).
Design and build contracts
can be awarded on a fixed-price, lump-sum basis, but price certainty is then
dependent on not making any subsequent changes, as those changes will not be part
of the fixed price and will be subject to additional charges.