3.3.1 Variations on the Design and Construct Model

There are some common variations to the design and construct model, e.g. -

• Design, novate and construct

• Design, develop and construct

• Design, construct and maintain

Design, Novate and Construct

In this type of contractual arrangement, the Principal initially engages a designer to prepare a schematic design or a more developed design. On the basis of that design, the Principal then engages a construction contractor who in turn enters into a subcontract with the same designer.

This model ensures the continuity of the designer's input from project inception to completion. By novation of the client-designer contract to the D&C contractor, the client's designer is taken on by the D&C contractor at the time of construction contract award. At this stage, either the schematic design or design development is completed. The contractor takes on full responsibility for the design including payment of the designer's fees.

The following figure illustrates this type of contractual arrangement -

Figure 6: Design, Novate and Construct Structure

Design, Develop and Construct

The client prepares a schematic design in addition to performance specifications, thereby giving a degree of control over the design output, while still transferring some of the design risk to the construction contractor.

Design, Construct and Maintain

In this model, the contractor has ongoing maintenance obligations in addition to design and construction. Lifecycle costs can be reduced if the contractor takes into account ongoing maintenance obligations when designing and constructing the facility.