When project delay becomes a recovery risk.

Time-related entitlement is shaped by contract administration, record quality, causation logic and the discipline with which delay is identified while the project is still live. By the time a delay dispute reaches adjudication, mediation or formal proceedings, the central question is rarely whether the contractor experienced difficulty. The question is whether the contractor can prove the contractual and factual consequences of that difficulty.

For contractors, this is where many otherwise genuine delay positions become commercially vulnerable. The works may have been disrupted. Access may have been restricted. Design information may have arrived late. Variations may have changed sequencing. Other trades may have affected progress. But unless those events are captured, notified, linked to programme logic and connected to the critical path, the recovery position may be far weaker than the project team believes. That is the distinction between experiencing delay and proving entitlement.

Delay must be proved, not just experienced

Delay is often understood operationally before it is understood contractually. The site team knows what happened. The commercial team knows where time was lost. The contractor may be confident that the employer, contract administrator, design team or other project participants caused the problem. However, that is not enough.

A delay claim needs a disciplined evidential structure. The contractor must usually identify the contractual event relied upon, the notice or procedural route required, the factual circumstances causing delay, the activity or sequence affected, the impact on completion or the relevant milestone, and the period of extension of time claimed. Where financial recovery is pursued, the contractor must also establish the separate basis for loss and expense or prolongation cost.

The Society of Construction Law Delay and Disruption Protocol remains an important industry reference point. It is not legislation and does not override the contract, but it is widely used as guidance for analysing extensions of time, delay and disruption. Its practical importance lies in its emphasis on transparency, records, methodology and contemporaneous analysis.

The legal and commercial point is straightforward. Delay entitlement is not created by frustration, disruption or pressure alone. It is created by the contract and proved through records and causation.

Why the contract still controls entitlement

Most UK construction delay disputes begin with the contract. Under JCT-style contracts, the route is usually through Relevant Events, notices, particulars and the contract administrator’s assessment of an extension of time. Under NEC-style contracts, the route is usually through early warnings, compensation events, programme acceptance and assessment. Bespoke contracts may alter those routes significantly.

That matters because entitlement can be lost, narrowed or made harder to prove if the contractor treats notice provisions as administration rather than risk control. Some clauses operate as strict conditions precedent. Others may be less severe but still affect credibility, timing and assessment. Either way, late or vague notices rarely help.

The courts have repeatedly treated delay disputes as questions of contractual interpretation and factual proof. Multiplex v Honeywell remains important because it considered the relationship between notice requirements, extension of time machinery and the prevention principle. The broader lesson is that contractors should not rely on general arguments about fairness after the event. The safer course is to understand the time provisions before delivery begins and administer the contract as though every notice may later need to be defended before an adjudicator.

Why causation matters

A contractor may be delayed in fact, but still fail to establish the delay claimed. That is because delay analysis is not simply a chronology. It is a causation exercise. The contractor must connect the event relied upon to actual delay to completion, or to the relevant contractual milestone, depending on the contract and the claim being advanced. This becomes particularly important where several issues are happening at once. A late design issue may coincide with labour underperformance. An employer instruction may coincide with procurement delay. Access restrictions may coincide with late subcontractor mobilisation. In those circumstances, the contractor must distinguish between employer-risk delay, contractor-risk delay, neutral delay, delay that affects progress but not completion, and delay that affects the critical path.

The modern position on concurrent delay remains commercially important. In North Midland Building Ltd v Cyden Homes Ltd, the Court of Appeal upheld a bespoke clause that excluded an extension of time where a Relevant Event was concurrent with contractor-responsible delay. The decision confirms that parties may allocate concurrency risk by express wording, and contractors should not assume that standard concurrent delay principles will rescue them where the contract has been amended.

Where the contract does not contain that kind of express exclusion, the Malmaison and Walter Lilly authorities remain important reference points. They are commonly understood as supporting the position that, in cases of true concurrent delay, a contractor may be entitled to an extension of time even though financial recovery for the same period may require separate proof.

That distinction is critical. Time and money are not the same claim. An extension of time may protect the contractor from liquidated damages. It does not automatically produce prolongation recovery.

The practical message for contractors

Delay records do not need to be perfect, but they do need to be purposeful. The strongest positions are usually built from ordinary project material captured consistently while the facts are live: accepted and updated programmes, progress records, daily diaries, labour and plant allocation records, photographs, design information logs, RFI schedules, access records, instruction and variation logs, subcontractor correspondence, meeting minutes, lookahead programmes, notices and particulars.

The problem is not usually that contractors keep no records. The problem is that records are often kept without a recovery structure. They exist, but they are not organised around entitlement, causation or valuation. When a dispute crystallises, the contractor is then forced to reconstruct the logic months later from fragmented evidence.

Recent adjudication and TCC decisions reinforce the same discipline. BDW Trading Ltd v Ardmore Construction Ltd was not a conventional delay claim, but it is still a useful reminder that the court may be unsympathetic where historic record-keeping issues are later used to resist adjudication enforcement. The wider lesson is that evidential difficulty is not always treated as a reason to avoid adjudication. Parties are expected to protect their position through records.

That matters because statutory adjudication can move quickly. Under section 108 of the Housing Grants, Construction and Regeneration Act 1996, qualifying construction contracts must include a right to refer disputes to adjudication at any time. Where the contract does not contain compliant adjudication provisions, the Scheme for Construction Contracts may apply.

For contractors, the consequence is clear. Delay disputes must be prepared while the project is live, not reconstructed after commercial leverage has already weakened.

Legalbuild’s view

Delay entitlement is not won by narrative alone. It is built through contractual discipline, contemporaneous evidence and a clear causation structure. The contractor’s position is strongest when delay is managed while the facts remain live: notices issued on time, programme impact assessed properly, records captured with purpose, and commercial consequences quantified before the project reaches a final account dispute or adjudication.

For Legalbuild, the central issue is not simply whether delay occurred. It is whether the contractor has built a recoverable position. That requires more than reacting to a late project. It requires the legal, evidential and commercial case to be built in the background from the point delay first emerges, so that entitlement is not diluted by missed notices, weak records, uncertain causation or avoidable procedural gaps. In delay disputes, project reality matters. But project reality must be capable of proof.

Source note:Multiplex Constructions (UK) Ltd v Honeywell Control Systems Ltd (No 2) [2007] EWHC 447 (TCC); Henry Boot Construction (UK) Ltd v Malmaison Hotel (Manchester) Ltd [1999] 70 Con LR 32; Walter Lilly & Company Ltd v Mackay and another [2012] EWHC 1773 (TCC); North Midland Building Ltd v Cyden Homes Ltd [2018] EWCA Civ 1744; Thomas Barnes & Sons plc (in administration) v Blackburn with Darwen Borough Council [2022] EWHC 2598 (TCC); BDW Trading Ltd v Ardmore Construction Ltd [2024] EWHC 3235 (TCC); Housing Grants, Construction and Regeneration Act 1996, section 108; Scheme for Construction Contracts (England and Wales) Regulations 1998; Society of Construction Law Delay and Disruption Protocol, 2nd edition.