Design And Construct Agreements For Projects With Split Responsibilities

It is usually the right fit where one contractual arrangement is meant to cover both the design side and the build side of the job. That can apply where a builder is taking on design responsibility directly, coordinating consultants, or pricing the works on the basis of a combined design-and-delivery model. If those roles are left unclear, disputes can arise about whether an issue sits with the plans, the construction work or a later change. A dedicated agreement helps record that structure in one place rather than leaving it spread across quotes and project correspondence.

A design and construct agreement commonly covers the design scope, construction scope, specifications, pricing model, progress payments, variation procedures, timing, approval pathways, site access, insurance positions, consultant responsibilities, defect-related issues, termination rights and dispute clauses. It may also deal with who is responsible for obtaining or relying on project information, and how design changes are approved once work is underway. The exact mix of clauses depends on whether you are acting as builder, subcontractor or principal, and how much design responsibility is being assumed under the deal.

The drafting usually depends on the project delivery model and the practical split of responsibilities across the parties. Important details include whether design is produced in-house or through external consultants, whether the scope is performance-based or tightly specified, how payment milestones are meant to operate, and what process applies when drawings, materials or timing change. Existing tender documents, scopes, quotations and consultant appointments can also affect the final structure. The more clearly those documents line up, the easier it is to produce an agreement that reflects the actual project setup.

Templates can be useful for reference, but they often do not deal well with project-specific issues such as staged design deliverables, consultant coordination, bespoke payment triggers or unusual variation pathways. In a design and construct job, even small wording gaps can matter if the parties later disagree about whether a problem came from design assumptions, construction execution or a change in scope. A more tailored document is often worth it where the commercial arrangement is more than a simple build-only engagement. If you already have a draft, it can often be reviewed and refined.

That depends on how settled the commercial deal already is and how much supporting material is available at the start. If you have a clear scope, pricing position and project documents, the drafting process is usually more straightforward. Where the arrangement is still evolving, or several consultant and project documents need to be reconciled, the work may take longer. Once the draft is prepared, you can review the wording, request changes within the included amendment round and then finalise the contract for signing and project use.

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