July 10, 2026

Delay under the JCT Design and Build Contract 2024

Delay is a persistent source of disputes in the construction industry. Sophie Bennett, Associate at Holmes & Hills Solicitors, examines the key delay mechanisms under JCT Design and Build 2024 (DB), highlighting notable features and practical considerations for employers and contractors alike.

The Completion Date and Extensions of Time

At the heart of the delay regime is the contractual Completion Date, stated in the Contract Particulars. The Contractor is obliged to complete the Works, or any Section where sectional completion applies, by this date. Where delay occurs, the contract provides a mechanism for adjusting the Completion Date through extensions of time (EOT) under clause 2.25.

The Contractor must give notice to the Employer whenever it becomes ‘reasonably apparent’ that the progress of the Works is being or is likely to be delayed. This notice must identify the cause or causes of the delay and, where the cause is a Relevant Event, must include particulars of the expected effects and an estimate of the expected delay. Importantly, the obligation to notify is ongoing: the Contractor must keep the Employer updated as circumstances change and must provide further information as reasonably necessary.

This can be further complicated by the addition of a condition precedent to the clause. Wording may be added that means that, in the event the Contractor does not notify the Employer of such delays, it is barred from an extension of time. This wording is not always signposted as ‘this is a condition precedent’, but can be more subtle. Contractors should take care where an obligation to act is linked to a specific outcome. “Provided that” or “to the extent that” may be used to oblige the Contactor to notify of delay, and may amount to a condition precedent.

Relevant Events

Extensions of time may only be granted where delay is caused by a "Relevant Event" as defined in clause 2.26. The list of Relevant Events under DB includes, among others:

  • Changes
  • Instructions issued by the Employer under certain clauses
  • Deferment of possession of the site
  • Civil commotion, terrorism, or threat thereof
  • Adverse weather conditions
  • Force majeure
  • Delay of any necessary permission or approval of any statutory body

The list of Relevant Events is frequently amended by a schedule of amendments so care should be taken to review each Relevant Event and the specific wording thereof to ensure that there is an agreed understanding between the parties on what does and does not constitute a Relevant Event.

The parties should consider definitions of adverse weather conditions and force majeure as these are particularly nebulous Relevant Events that both sides would benefit from clarifying.

The Employer's Assessment

Upon receiving the Contractor's notice and supporting particulars, the Employer is required to give an extension of time by fixing a later Completion Date where it is fair and reasonable to do so, having regard to any delay caused by a Relevant Event. The Employer must make this assessment whether or not the Contractor has complied strictly with the notice requirements, although this is often amended so parties should review these clauses carefully.

The Employer must notify the Contractor of its decision within eight weeks of receiving sufficiently detailed particulars, or receipt of further information.

Liquidated Damages

If the Contractor fails to complete by the Completion Date (as may have been extended), the Employer may issue a notice of non-completion under clause 2.28. This notice is a prerequisite to the deduction or recovery of liquidated damages under clause 2.29. The rate of liquidated damages is stated in the Contract Particulars and represents a pre-agreed measure of the Employer's loss for late completion.

Should a further extension of time be granted after a notice of non-completion has been issued, the Employer must re-issue the notice to reflect the revised Completion Date. Any liquidated damages overpaid must be repaid to the Contractor.

There is a separate mechanism for liquidated damages that can be amended so parties will need to review this carefully. Levying liquidated damages against the Contractor requires three notices to be issued by the Employer:

  1. Non-Completion Notice
  2. Notification of intention to withhold liquidated damages
  3. Notice of liquidated damages

Once a Non-Completion Notice has been issued, the Employer needs to notify the Contractor before the final date for payment that it intends to withhold, deduct or may require payment of liquidated damages. Subsequently, but at least 5 days prior to the final date for payment, the Employer mist notify the Contractor that it is withholding, deducting or requires payment of liquidated damages. Such notice must include:

  1. The period for which liquidated damages are being levied; and
  2. A statement that the Employer requires the Contractor to pay liquidated damages at the rate stated in the Contract Particulars (or at a lesser rate, which must be stated), and that such may be recovered as a debt; and/or
  3. A statement that the Employer will withhold or deduct liquidated damages at the rate stated in the Contract Particulars (or at a lesser rate, which must be stated) from sums due to the Contractor

Concurrent Delay

DB 2024, in common with earlier editions, does not contain an express provision addressing concurrent delay where an Employer risk event and a Contractor risk event cause delay at the same time. The prevailing judicial approach suggests that the Contractor is entitled to an extension of time but not additional monies. Parties seeking greater certainty should address concurrency expressly through amendments to the contract.

Practical Takeaways

  • Timely notice is essential: A failure to notify promptly can weaken the Contractor's position in practice and in any dispute, especially if there is a condition precedent where it may bar the claim completely.
  • Record-keeping matters: Records of progress, delay events, and their impact are invaluable in substantiating an EOT claim.
  • Understand the mechanisms: Both parties should be familiar with the procedural steps for claiming and granting extensions, as procedural failures can complicate recovery of liquidated damages or create further disputes.

Conclusion

The delay provisions of DB 2024 provide a broadly balanced framework for managing the consequences of delay. However, their effective operation depends on good record-keeping and the administration of the proper notices by both parties. Understanding the interplay between notice obligations, Relevant Events, and liquidated damages remains crucial for the successful delivery of design and build projects.

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From the firm’s seven offices across Essex and Suffolk, our specialist Construction team provides services to clients which are based across the whole of the UK in addition to those across East Anglia, the South East and in London. Contact our team today.

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Disclaimer

The content of this article is provided for general information only. It does not constitute legal or other professional advice. The information given in this article is correct at the date of publication.

Key Contact

Sophie Bennett

Associate

s.bennett@holmes-hills.co.uk

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