Claims · Delay Analysis

Time-Related Claims: Extension of Time, Delay Analysis and Damages

How to assess delay events, quantify critical path impact, and calculate prolongation costs under FIDIC and UAE law.

8 min read · Updated 24/04/2026

In this article

1. Time-Related Claims: Contractual Framework Under FIDIC
2. Extension of Time (EOT): Entitlements and Procedure
3. Prolongation Costs: Quantifying Delay-Related Damages
4. Liquidated Damages: Liability and Relief
5. Critical Path Analysis: The Foundation of Delay Claims
6. Concurrent Delay: The Complicating Factor
7. Delay Analysis Methodology and Expert Assessment

Key takeaway

Time-related claims comprise two distinct entitlements: (1) Extension of Time (EOT)—additional calendar days to reach Practical Completion—and (2) Prolongation Cost Claims—recovery of standing-time costs incurred during delay. Critical path analysis is the foundation of both. Concurrent delay and delay causation add complexity and require expert analysis.

1. Time-Related Claims: Contractual Framework Under FIDIC

Every construction contract establishes a time for completion—either a fixed date (e.g., 30 June 2026) or a duration (e.g., 24 months from Commencement). The contractor is obligated to achieve Practical Completion by that date. If the contractor fails to do so, it may be liable for Liquidated Damages (LD) to the Employer.

However, not all delays are the contractor’s fault. FIDIC contracts recognize that certain delay events—for which the contractor is not responsible—entitle the contractor to relief:

• Extension of Time (EOT): Additional time granted to the contractor to reach Practical Completion, removing or reducing LD exposure.
• Cost Relief: Recovery of additional costs incurred due to the delay (prolongation costs).

A critical principle: The Employer cannot benefit from its own breaches. If the Employer causes delay (e.g., fails to issue drawings, denies site access), the contractor is not liable for LD, and the Employer has no remedy for delay—the Contractor may also claim for cost relief.

2. Extension of Time (EOT): Entitlements and Procedure

Extension of Time (EOT) is additional calendar time granted to the contractor to reach Practical Completion, triggered by delay events for which the contractor is not responsible.

FIDIC 1999 Red Book: Clause 20.1

Clause 20.1 entitles the contractor to EOT if:

• An event occurs (or circumstances arise) which is listed in Clause 20.1(a)–(b) as entitling the contractor to EOT.
• The delay event is not the result of the contractor’s default or negligence.
• The contractor gives timely notice (within 28 days of becoming aware of the event).
• The Engineer is satisfied the delay is on the critical path and causes delay to Practical Completion.

The listed delay events typically include:

• Employer-caused delays (failure to issue drawings, denying access, providing inaccurate site information).
• Events beyond both parties’ control (force majeure: war, natural disaster, epidemic).
• Variation Orders issued by the Engineer.
• Suspension of work by the Engineer.
• Exceptional adverse weather conditions.

Notice and Claim Procedure

The contractor must observe strict procedural requirements:

• Timely Notice: Within 28 days of the event occurring (or becoming aware of it), the contractor must notify the Engineer of the potential delay.
• Detailed Submission: Within a specified period (typically 42–56 days), the contractor must submit detailed evidence: schedule analysis, impact assessment, delay causation, and cost substantiation (if also claiming for cost relief).
• Engineer’s Decision: The Engineer assesses the claim and grants (or rejects) EOT. The Engineer’s decision is binding unless disputed in arbitration.

Critical Point: Failure to provide notice within the prescribed period typically forfeits the right to claim EOT and cost relief, even if the delay event is genuine. Procedural compliance is as important as substantive entitlement.

3. Prolongation Costs: Quantifying Delay-Related Damages

EOT establishes the contractor’s right to additional time; prolongation cost relief is a separate claim for the additional costs incurred due to the delay.

Prolongation costs include:

• Site Staff and Supervision: Salaries and overhead of site management staff remaining on site during the delay period.
• Preliminary Items: Cost of temporary site facilities (site office, containers, canteens, security) for the extended duration.
• Equipment Hire: Cost of equipment (tower cranes, concrete pumps, scaffolding) kept on site during delay, at hire rates.
• Financing Costs: Interest on working capital financed during the delay period, if the contract allows.
• Inflation and Escalation: Increased labour and material costs due to price rises during the delay.
• Insurance: Extended insurance premiums for public liability, contractor’s all-risk, and workers’ compensation.

Prolongation costs must be substantiated with:

• Invoices for salaries, equipment hire, and insurance premiums.
• Cost rates from the contract or market quotes.
• Schedule analysis proving the delay days.
• Proof that the costs were actually incurred (payroll records, hire agreements).

4. Liquidated Damages: Liability and Relief

Most construction contracts include a Liquidated Damages (LD) clause that specifies a daily or weekly penalty payable by the contractor if Practical Completion is not achieved by the agreed date.

LD is a genuine pre-estimate of the Employer’s loss, not a penalty. The Employer may deduct LD from payments due or claim it separately. LD accumulates daily until Practical Completion is achieved.

Mitigation Through EOT

Granting EOT removes or reduces LD exposure. For each day of EOT granted, the contractor’s LD liability is reduced by one day. In the example above, if the contractor is granted 60 days EOT, the new Practical Completion date moves 60 days forward, and 60 days of LD is extinguished.

Strategic Importance: A contractor facing significant LD exposure must pursue EOT aggressively and ensure timely notice and procedural compliance. Delay in claiming EOT can result in loss of relief and continued LD liability for the unclaimed period.

Contractor-Caused Delays

If the contractor is responsible for delay (e.g., contractor’s workforce failure, contractor’s equipment breakdown), the contractor is not entitled to EOT and LD liability continues to accrue. Conversely, the Employer may have a claim against the contractor for damages resulting from the contractor’s delay (additional supervision costs, lost revenue from the delayed project, etc.).

5. Critical Path Analysis: The Foundation of Delay Claims

Critical Path Analysis (CPA) is the methodology used to quantify delay. The critical path is the longest sequence of dependent activities; any delay to a critical path activity causes delay to project completion.

To succeed in a delay claim, the contractor must prove:

• The delay event occurred: Documentary evidence (correspondence, site records, certificates).
• The delay was on the critical path: Schedule analysis showing the activity was critical at the time of delay.
• The delay duration: The number of calendar days the event caused delay to project completion.
• Causation: The delay event directly caused the project delay (applying the “but for” test: but for the event, the project would not have been delayed).

CPA requires detailed programme information: the contract baseline programme, updated programmes reflecting actual progress, and a detailed reconstruction of the delay causation timeline.

6. Concurrent Delay: The Complicating Factor

Concurrent delay occurs when two or more delay events occur at the same time, and both contribute to project delay. Allocation of responsibility becomes complex.

Scenarios include:

• Employer delay + Contractor delay: The Employer delays in issuing drawings; the Contractor also suffers a workforce shortage. Both events are critical path and occur simultaneously.
• Employer delay + Force majeure: The Employer causes delay; simultaneously, an exceptional weather event also impacts the critical path.

Treatment of concurrent delay varies:

• FIDIC Approach: Many FIDIC contracts grant EOT for all compensable delay events, even if concurrent contractor delay exists. The contractor may not claim cost relief for the delay days attributable to its own acts (contractor delay is not compensable).
• UAE Law (General Principle): Where both parties contribute to delay, liability is apportioned according to the degree of each party’s responsibility.

Concurrent delay disputes are among the most contentious in construction arbitration and require meticulous schedule analysis and expert evidence.

7. Delay Analysis Methodology and Expert Assessment

Delay analysis is a specialized discipline. Several methodologies are used to assess delay causation and duration:

Common Delay Analysis Techniques

• As-Planned vs. As-Built: Compare the contractor’s original programme to what actually occurred. Delays are identified by gaps between planned and actual dates.
• Time Impact Analysis: Model the effect of each delay event on the project schedule. Requires detailed programme data and scenario analysis.
• Retrospective Analysis: Reconstruct the critical path at the time each delay event occurred, assessing its impact as if it had been unknown at that point.
• Windows Analysis: Divide the project into time periods (windows), assess critical activities in each window, and allocate delays to each window and responsible party.

Different methodologies can yield different conclusions when applied to the same delay data. The choice depends on:

• Quality and completeness of programme data (baseline, updates, as-built records).
• Complexity of the project and number of delay events.
• Presence of concurrent delay.
• Availability of contemporaneous evidence (site records, correspondence).

Expert delay analysis requires a qualified schedule analyst or claims consultant, typically an engineer or quantity surveyor with specialist training in delay methodologies and project scheduling software (Primavera P6, MS Project). The expert must apply the selected methodology consistently, explain assumptions and limitations, and present findings in a way that arbitrators can understand and test.

Most significant delay disputes—those involving multiple delay events, concurrent delay, or disputed causation—should be assessed by independent expert evidence. Early expert assessment can often clarify the claim, identify weaknesses, and lead to negotiated settlement without full arbitration.

Quantify Your Delay Claim with Expert Analysis

Delay claims are complex, requiring rigorous critical path analysis, substantiated prolongation costs, and strict procedural compliance with notice and documentation requirements. Whether you are pursuing an EOT claim, defending against delay allegations, or quantifying prolongation damages, expert assessment is essential. Our delay analysis experts can review your claim, prepare schedule analysis, and present persuasive expert evidence to the Engineer or arbitrator.

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