Standard Contract Provision: Under unamended Clause 2.17.1 of DBSub/C 2016, the subcontractor is required to give written notice “forthwith” if it becomes reasonably apparent that the commencement, progress, or completion of the subcontract works is being delayed.

Potential Amendments to Review: Some bespoke amendments may delete this open-ended wording and insert a strict notification period (such as 3, 5, or 7 working days), drafting the requirement expressly as a condition precedent to any Extension of Time (EOT) entitlement.

Commercial Risk: If an amendment establishes a condition precedent, failing to submit the notice within the stipulated window can mean forfeiting the contractual right to an extension of time. While standard loss and expense under Clause 4.14 is a distinct procedure that requires prompt notification without being an automatic condition precedent, some bespoke amendments may insert matching time-bars across Section 4. Losing an extension of time can expose the subcontractor to contractual delay claims or liquidated damages deducted upstream.

Standard Contract Provision: Standard Clause 2.13 benchmarks the Sub-Contractor’s Designed Works to the standard of reasonable skill and care ordinarily exercised by an experienced architect or professional designer.

Potential Amendments to Review: Some bespoke amendments may modify this provision to impose an obligation that the completed design and installation will be “fit for its intended purpose”.

Commercial Risk: A duty of reasonable skill and care requires performance in line with competent professional standards, whereas a fitness-for-purpose warranty creates a result-based obligation that may be stricter than reasonable skill and care, depending on the wording. Standard UK Professional Indemnity (PI) insurance policies are typically underwritten on a negligence basis (reasonable skill and care). Accepting a fitness-for-purpose warranty may create contractual liabilities that exceed policy cover. Subcontractors should have their broker or insurer review any design warranty amendments prior to execution.

Standard Contract Provision: Under standard DBSub/C terms, the Final Date for Payment is set at 14 days from the Due Date, providing a predictable monthly cash flow cycle.

Potential Amendments to Review: Some amendments may extend the interval between the Due Date and the Final Date for Payment (for example, to 30, 45, or 60 days) or introduce multi-stage administrative dependencies before a payment application is certified.

Commercial Risk: In England, Wales, and Scotland, the Housing Grants, Construction and Regeneration Act 1996 allows commercial parties freedom to agree the period between the Due Date and the Final Date for Payment, provided the agreement establishes an adequate payment mechanism under Section 110. Section 113 prohibits conditional “pay-when-paid” clauses (except in circumstances of the relevant upstream party’s insolvency under the statutory exception). However, extended payment periods increase working capital pressure and elevate exposure to contractor insolvency during lengthy credit cycles.

Standard Contract Provision: Standard JCT conditions govern deductions relating to the specific subcontract package and define how main contract deductions operate, requiring compliant payment notices and Pay Less Notices under Section 111 of the Act.

Potential Amendments to Review: Some bespoke amendments may insert cross-contract set-off terms, entitling the contractor to deduct alleged losses, costs, or damages arising on one site from payments due under an entirely separate contract.

Commercial Risk: Cross-contract set-off provisions introduce significant commercial risk. If a dispute arises on one development, the contractor may seek to withhold certified sums on a different project. The enforceability of such terms depends on the exact drafting, applicable notice procedures, and the specific facts. Subcontractors should treat broad set-off wording as a major commercial risk item during tender negotiations.