What Is a Design and Build Project?

A design and build project is one where the client engages a contractor to deliver both the design and construction under a single main contract. In Australia this is generally called design and construct (D&C). The client specifies what is required; the contractor engages designers, develops the design and builds the project.

The single contract can simplify responsibility, but the owner still needs to define the outcome and make decisions. A D&C contract is a way to allocate work and risk, not an automatic guarantee of speed, price certainty or design quality.

How does a project proceed?

1. Client brief. The owner sets the functional, performance and quality requirements. It may provide a concept design, site information and operational constraints. Good requirements explain what matters to users and maintainers.

2. Tender and evaluation. Contractors propose an approach, design response, programme and price. The client compares the whole offer, including qualifications, assumptions, design departures and the team’s ability to deliver.

3. Design development. The selected contractor manages its architects, engineers and other consultants to complete design and construction documentation. The contract sets review points, approvals and how comments are dealt with.

4. Construction. The contractor coordinates procurement, trades, site work, testing and records. Some design and construction activities may overlap where the contract and approvals allow it.

5. Handover. The client checks completion requirements, commissioning, training, defects, warranties and usable asset information against the contract.

What does the client need to manage?

The client owns the business need. It should establish clear requirements before tender, identify who can approve a departure, review design at meaningful stages and record changes formally. The contractor’s design team normally answers to the contractor; independent client-side review can help the owner assess whether the developing outcome still meets its brief.

Government procurement guidance notes that D&C can support overlapping design and construction, while the owner’s direct control of design may be reduced. The right choice depends on how well the owner can specify the result and manage the review process.

For terminology, read what design and construct means. For a procurement comparison, see DBB versus DB. Team Vanguard can help owners coordinate the brief, tender evaluation and delivery oversight.

Sources and further reading

• Australian Institute of Architects — design and construct
• NSW Government — construction procurement contract systems
• Office of the Victorian Government Architect — procurement of buildings