JCT Design and Build Sub-Contract Agreement 2024 (DBSub/A)

The JCT Design and Build Contract is designed for construction projects where the contractor carries out both the design and the construction work. Design and build projects can vary in scale, but the Design and Build Contract is generally suitable where detailed provisions are needed.

The Design and Build Sub-Contract is made up of two parts: the Sub-Contract Agreement (DBSub/A) which includes the Recitals, Articles and Sub-Contract Particulars, and the Sub-Contract Conditions (DBSub/C).

• can only be used when the main contract is the Design and Build Contract.
• can be used where the sub-contracted works are fully designed, or if the sub-contractor is required to design all or a part of the works.
• can be used when either the main contract works or the sub-contract works are to be carried out in sections.
• can be be used for sub-contract works that are to be carried out on the basis of an adjusted sub-contract sum (adjustment for variations etc.) or by complete remeasurement.
• Provisions are included for collaborative working, sustainability and bonds (off-site materials and retention).