What is a subcontract delay notice time-bar? In the JCT Design and Build Sub-Contract Conditions (DBSub/C 2016)—specifically drafted for use with the JCT Design and Build main contract (DB 2016)—Clause 2.17 requires the subcontractor to give written notice of delay forthwith when delay becomes reasonably apparent. While the JCT has superseded the 2016 suite with the 2024 edition, existing projects frequently continue under 2016 terms. Some bespoke amendments impose shorter notification deadlines or make timely notice an express condition of entitlement, which may place an extension-of-time claim at risk.
Edition Scope Note: This guide addresses existing contracts running under JCT DBSub/C 2016 conditions. If you are entering into a new procurement, verify whether your agreement incorporates 2016 or 2024 conditions.
Received a Delay Deduction or Pay Less Notice?
The rules under Section 111 of the Construction Act apply when a payer proposes to pay less than the notified sum, setting out the procedure for an effective notice of intention to pay less. Section 111 does not create the underlying entitlement to deduct delay damages; that substantive right must exist under the signed subcontract. Review proposed deductions promptly using my structured response templates.
- Section 111 Commercial Response Letter Template (.docx) — a structured commercial template, not an official statutory form
- Payee Notice in Default under Section 110B Template (.docx)
- 10-Point Pay Less Notice Validity Review Checklist (.pdf)
- Section 112 Notice Template (.docx) — a 7-day written notice of intention to suspend performance, for use strictly where the statutory right to suspend for non-payment applies under the Act
Purchased the £37 Response Pack?
Your £37 purchase can be applied as a single-use credit toward your first month of the Trade Contracts Simplified commercial retainer. Because I configure each subcontractor account personally, email me at steve@yourtechneighbour.co.uk quoting your purchase email within 30 days of purchase. I will verify your order and provide your direct link to secure your first month of unlimited contract scans for £12.00.
1. Technical Authority: DBSub/C 2016 Delay Mechanics
In the standard JCT Design and Build Sub-Contract Conditions (DBSub/C 2016), delay notifications, events, and loss and expense operate under distinct provisions:
- Clause 2.17 Notice of Delay: In DBSub/C 2016, this is the Sub-Contractor delay-notice provision. You must give written notice forthwith if it becomes reasonably apparent that the commencement, progress, or completion of the Sub-Contract Works is being or is likely to be delayed. Check your executed schedule of amendments to verify whether notice timing has been made an express condition of entitlement.
- Clause 2.19 Relevant Sub-Contract Events: Clause 2.19 provides the catalogue of Relevant Sub-Contract Events. While Clause 2.19 defines which events qualify for an extension of time, the procedural notice obligations you must follow are set out under Clause 2.17 and any bespoke amendments. Always check your signed contract terms and schedule of amendments to confirm which events are covered and what notice is required.
- Clauses 4.14 to 4.18 (Direct Loss and/or Expense): Claims for ascertainable loss and expense are governed by independent notice and substantiation procedures under Section 4. Serving a delay notice under Clause 2.17 does not automatically establish or satisfy a claim for loss and expense.
- Subcontract Isolation: Do not confuse subcontract mechanics with the head contract. In DBSub/C 2016, delay notice requirements fall under Clause 2.17 and Relevant Sub-Contract Events under Clause 2.19. Always examine the executed subcontract rather than main contract terms.
Sample Bespoke Condition Precedent Clause
Some bespoke amendments modify DBSub/C 2016 Clause 2.17 using illustrative wording such as:
“Provided always that it shall be a condition precedent to the Sub-Contractor’s entitlement to any extension of time under Clause 2.18 that the Sub-Contractor shall have given written notice of the delay to the Contractor within three (3) business days of the commencement of the delay event…”
(Note: The wording above is an illustrative example of a bespoke amendment and does not form part of standard unamended JCT contract forms.)
Under this type of bespoke clause, failing to satisfy the mandatory notice deadline may give the main contractor grounds to argue that an extension-of-time entitlement is barred.
2. Practical Site Reality: How Delays Develop
Delays occur on commercial projects for numerous operational reasons: preceding trades do not hand over work areas on time, design details are revised, or access routes become obstructed. Site teams occasionally suggest working around the problem with an informal assurance that the programme impact will be assessed later.
Do not rely on verbal reassurances. Where a subcontract amendment makes written notice within a set period a condition of entitlement, failing to submit formal notice within that agreed timescale may give the main contractor contractual grounds to challenge the claim, depending on the terms and facts.
Did an unwritten site direction affect your work?
Subcontract delays often start when a site manager gives an oral direction to alter sequences or undertake extra work. Follow the executed subcontract’s procedure for directions given otherwise than in writing: record who gave the direction, when it was given, and what changed. Check your signed contract terms to determine whether formal written confirmation is required to validate the direction. Do not assume an unwritten instruction replaces a required Clause 2.17 delay notice.
Draft a Free CVI Written Record →3. Loss Aversion: Protecting Subcontract Entitlement
Missing bespoke notification windows damages commercial recovery across several key areas:
- Risk to Extension of Time: If an extension of time is rejected due to non-compliant notice, your completion date remains fixed, exposing your business to potential claims for delay damages or set-off.
- Unrecovered Prolongation Costs: Extended site supervision, non-productive labour, and standing plant quickly erode trade margins unless pursued under Clauses 4.14 to 4.18.
- Payment Notice Scrutiny: The Section 111 procedure applies when a payer proposes to pay less than the notified sum, but substantive entitlement to deduct delay damages depends on the subcontract terms. Check whether deductions comply with both the subcontract and statutory rules by reviewing my invalid Pay Less Notice checklist.