For subcontractors, an extension of time claim seeks an adjustment to the completion date under the subcontract for a qualifying delay.
An unsupported or non-compliant claim can leave the subcontractor exposed to liquidated damages if the completion date is not adjusted.
It can also affect the subcontractor’s position on interim payment, prolongation costs and final account valuation.
For that reason, the review should start with the subcontract, notice route, delay event, programme effect and records. Those checks should come before preparing the detailed claim submission.
This article explains how to review entitlement, notice compliance, causation, programme logic and records before deciding whether to revise the claim, provide further substantiation, negotiate or prepare for adjudication.
Key Takeaways
- A properly framed extension of time claim starts with the subcontract mechanism, not a general complaint about delay.
- The claim should identify the event, notice route, affected activities, critical path effect and period of delay.
- Programme logic and records should link the delay event to the affected activities, programme effect and period of delay claimed.
- Test time relief separately from loss and expense or prolongation costs because each may require its own entitlement route, causation evidence and records.
- Delay records should show what happened, when it happened, what caused the delay and how completion was affected.
- Incomplete, unreliable or poorly linked records can make a potentially qualifying delay event difficult to substantiate.
- The subcontract position, notice position, evidence and dispute status should guide whether the next step is a revised claim, further substantiation, negotiation or adjudication preparation.
Key Definitions
Extension of time. A contractual adjustment to the date for completion, completion period or contractual milestone under the subcontract, available where a delay event or matter gives entitlement to time relief and the subcontract conditions for that adjustment are satisfied.
Delay event. An event or matter relied on as giving rise to time relief under the subcontract and as causing delay to completion, the completion period or a contractual milestone in the manner required by the subcontract.
Critical path. The sequence of logically linked activities that determines the earliest completion date, completion period or contractual milestone at the relevant assessment point.
Programme impact. The effect of a delay event or matter on programme logic, planned sequence, activity dates, access, resources, float, the critical path, completion date or contractual milestone.
Contemporaneous records. Records created at the time of, or shortly after, the event, activity, delay period or matter to which they relate.
Loss and expense. A contractual claim for financial recovery of loss, expense or additional cost incurred because of a matter for which the subcontract provides financial recovery.
Extension of Time Claim Entitlement, Evidence and Review Sequence
A properly substantiated extension of time claim should answer a clear sequence of subcontract, notice, causation, programme and records questions.
The review should ask which event the claim relies on and which subcontract route allows time relief. It should then identify the required notice, affected activity and delay period claimed.
The subcontract is the starting point. It may define the events that allow time relief, the notice period and the person, role or mechanism that assesses the claim. Amendments can change the notice requirements, assessment process, time-bar wording or remedy available.
The subcontractor should identify the relief sought before developing the claim submission.
An extension of time claim usually concerns time relief and the completion date under the subcontract. It does not automatically prove entitlement to loss and expense or prolongation costs.
That distinction matters because the evidence may differ. Time relief depends on the event, notice, causation, programme effect and subcontract assessment route. Loss and expense or prolongation costs usually need a separate entitlement route, cost records and proof of cost causation.
Where independent delay analysis is required, delay expert opinion may address causation, programme effect and the period of delay.
Where independent quantum analysis is required, quantum expert opinion may address valuation, cost causation and substantiation.
Before submitting or revising the claim, the subcontractor should test the entitlement route, notice position, evidence and remedy sought against the subcontract and project records.
Subcontract Notice Requirements and Entitlement
The subcontractor should check the subcontract before finalising the claim narrative. A properly framed extension of time claim identifies the clause, event and notice steps relied on.
Notice timing may affect whether the subcontractor can rely on the delay event for time relief. Some subcontracts require notice within a stated period after the event or after the delaying effect becomes apparent. The subcontractor should check the wording, amendments and project records before deciding whether a time-bar point affects the claim.
The submission should identify the clause, amendment or notice provision relied on for time relief. That assessment should be based on the subcontract, amendments and project records.
Where the subcontract requires a delay notice, the notice should identify the event, timing, affected works, likely effect on completion and records available at that point.
Later submissions can then develop the programme analysis and evidence.
The SCL Delay and Disruption Protocol provides guidance on delay analysis and records. It may assist the assessment, but it is not the source of entitlement unless the subcontract makes it relevant. The subcontract still controls notice requirements, entitlement and remedy.
Programme Logic and Critical Path for an Extension of Time Claim
Programme logic should connect the delay event to the extension of time requested. It should explain how the delay event affected the planned work sequence and whether that effect delayed completion under the subcontract or the relevant milestone.
The claim should identify the critical path relied on at the relevant assessment point. It should show the planned activities, actual progress, affected activities and link to completion under the subcontract or the relevant milestone.
The programme used for the claim should support the delay analysis. The baseline programme may show the original planned sequence. Progress updates may show actual progress at the time of the delay event. Retrospective analysis may compare planned progress, actual progress and the effect of the delay event on completion under the subcontract or the relevant milestone.
The delay analysis methodology should be selected by reference to the subcontract, available programme data, contemporaneous records, programme quality and timing of the assessment. A detailed methodology may carry limited weight if the programme data is incomplete or the claimed logic does not align with contemporaneous site records.
RICS Extensions of time, 1st edition practice information addresses extension of time clauses, costs of delay and delay assessment methods. It may assist with selecting and explaining the delay analysis methodology, but the basis of the claim remains the subcontract, facts, notices, programme evidence and records.
Records That Support Delay Causation and Programme Effect
In practice, records are the foundation of the claim. They should support the event relied on, the work affected and the effect on progress.
Useful records may include:
- access records;
- correspondence;
- design logs;
- drawings;
- instructions;
- minutes;
- notices;
- photographs;
- procurement records;
- programme updates;
- requests for information; and
- site diaries.
The subcontractor should group the records by delay event, affected activity, causation point and delay period, and explain the issue each key record supports. The volume of records is less important than whether the submission links the records to the event, causation, programme effect and period claimed.
For example, a late drawing issue may explain why an activity could not start. Site diaries may show that labour was redeployed. Programme updates may show whether that activity was on the critical path at the relevant time.
The submission should also address mitigation. If the subcontractor resequenced work, increased resources or opened another work front, the submission should explain what mitigation was attempted and whether residual delay to completion under the subcontract or the relevant milestone remained.
Time Relief in an Extension of Time Claim
The subcontractor should separate time relief from loss and expense or prolongation costs. An extension of time, if granted, awarded or assessed as due under the subcontract, may adjust the completion date and reduce or avoid exposure to liquidated damages. It does not automatically establish entitlement to additional cost.
For any loss and expense or prolongation costs, the review should identify:
- causation;
- cost records;
- entitlement route; and
- period claimed.
The distinction matters because time relief and additional cost may fail for different reasons. A claim may be well supported on time relief but insufficiently substantiated on cost causation, valuation or records. Another claim may involve additional cost but lack sufficient critical path analysis. Treating both issues as one unsupported submission can make it harder to identify the time relief, cost entitlement and evidence supporting each part of the claim.
If a dispute has crystallised and adjudication is the chosen route, the referral should identify the dispute referred, the basis for time relief under the subcontract, the delay event, notice position, programme analysis, supporting records and the decision or remedy sought.
Where delay or quantum expert evidence is relied on, the referral should explain how that evidence supports the period of delay, causation, valuation or remedy.
Practical Checklist
- Identify the subcontract, amendments and notice requirements.
- Confirm the event relied on and the route for time relief under the subcontract.
- Identify the person, role or mechanism that assesses the extension of time claim under the subcontract.
- Check whether notice was required and when it was given.
- Build a chronology of the event, affected activities and key project communications.
- Identify the baseline programme, progress updates and programme records relied on.
- Explain the critical path effect and the period of delay claimed.
- Link each key record to the issue it supports.
- Check whether the records support the event, causation, programme effect and delay period.
- Test time relief separately from loss and expense or prolongation costs.
- Decide whether the subcontract position, notice position, evidence and dispute status support a revised claim, further substantiation, negotiation or adjudication preparation.
Common Mistakes
- Treating an extension of time claim as an unsupported delay narrative. The claim should identify the subcontract route, delay event, affected activities and period of delay.
- Missing the notice period or subcontract notice route. A delay event may be difficult to rely on, or time relief may be prejudiced, if the claim does not comply with the subcontract’s notice requirements or time bar wording.
- Serving an incomplete notice. A notice should identify the event, timing, affected works and expected effect where the subcontract requires that information.
- Relying on a programme that does not match the actual progress records. This can weaken the link between the event, affected activities and completion effect.
- Treating non-critical or insufficiently analysed delay as critical delay. The claim should explain the activity sequence and completion effect.
- Combining time relief with loss and expense or prolongation costs in one unsupported submission. Time relief and cost claims may require different entitlement routes, causation evidence and records.
- Producing records in bulk without explaining what each key document supports. This can leave entitlement, causation, programme effect and the period of delay unsupported.
- Waiting until adjudication preparation before building the chronology, programme logic and records. Late preparation can make it harder to substantiate the delay period and present a coherent adjudication position.
ICRS View
An extension of time claim should be reviewed through entitlement, notice, causation, programme effect and records before the claimant advances a revised claim, negotiation position or adjudication position.
The review should separate four questions:
- Does the subcontract provide a route for time relief?
- Was the required notice served and framed in accordance with the subcontract?
- Did the event affect the critical path or completion?
- Do the records support the period claimed?
That sequence helps test both the claimant’s entitlement case and the respondent’s assessment. It helps a claimant avoid overstating delay. It also helps a respondent focus on the actual weakness in the submission.
Once those questions are answered, the next step should follow the subcontract position, evidence and dispute status:
- a revised claim;
- further substantiation;
- negotiation; or
- adjudication preparation.
Frequently Asked Questions
- What should a subcontractor check at the start of an extension of time claim?
Start with the subcontract. Identify the event relied on, the route for time relief and any notice requirements. Then check the affected activities, critical path effect or completion effect, and the period of delay claimed by reference to programme evidence and contemporaneous records.
- What records support an extension of time claim?
Useful records may include:
- correspondence;
- instructions;
- minutes;
- notices;
- photographs;
- procurement records;
- programme updates; and
- site diaries.
The submission should link the records to the delay event, affected activity, causation, programme effect and period of delay claimed.
- Why might an extension of time claim be rejected or assessed at nil?
An extension of time claim may be rejected or assessed at nil if the subcontract route, notice position, causation, programme effect or records do not support time relief.
Any assessment should be made by the person or role identified in the subcontract and in accordance with the subcontract assessment procedure.
- Can an extension of time claim be assessed for a shorter period than claimed?
Yes. An extension of time claim may be assessed for a shorter period than claimed where only part of the claimed period is supported by the subcontract, causation analysis, programme evidence and records.
That may happen where the records support the delay event but not the full period claimed, the critical path effect is shorter than alleged, or part of the delay is caused by a separate event.
- Does an extension of time automatically give entitlement to loss and expense?
Not automatically. An extension of time concerns time relief. Loss and expense or prolongation costs require their own subcontract entitlement route, causation evidence, cost records and period of claim.
- When should an extension of time dispute be referred to adjudication?
Adjudication may be considered where a dispute has crystallised and the evidence supports the decision or remedy sought.
If adjudication is the chosen route, the referral should identify the dispute referred, the basis for time relief under the subcontract, the notice position, programme analysis, supporting records and the decision or remedy sought.
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