Prolongation Claims: Addressing Extended Project Timelines in Construction
In the construction industry, projects often face delays due to unforeseen circumstances, design changes, or client-driven variations. When such delays extend the project duration beyond the agreed contractual completion date, contractors may be entitled to recover additional costs incurred. These requests for compensation are commonly referred to as prolongation claims.
What Are Prolongation Claims?
A prolongation claim is a formal request by a contractor to recover costs arising from the extended duration of a project. Unlike disruption claims, which address loss of productivity, prolongation claims specifically relate to expenses caused by the project lasting longer than planned.
Typical Causes of Prolongation Claims
Client Variations – Changes in design, scope, or specifications that extend timelines.
Late Approvals – Delays in drawing approvals, permits, or decisions.
Access Issues – Site availability problems or restrictions.
Force Majeure Events – Unforeseen events such as extreme weather or regulatory changes.
Concurrent Delays – Situations where delays caused by multiple parties overlap.
Recoverable Costs in Prolongation Claims
Prolongation costs are those that a contractor would not have incurred if the project had finished on time. Common heads of claim include:
Site Overheads – Additional supervision, site facilities, and equipment.
Head Office Overheads – Extended project management and administration costs.
Finance Charges – Increased interest on loans or delayed payments.
Extended Use of Plant and Equipment – Costs for machinery remaining on site beyond planned use.
Wages and Salaries – Staff retained for longer than originally scheduled.
Proving a Prolongation Claim
To succeed, contractors must provide clear evidence that:
The delay was caused by the employer or an excusable event under the contract.
The delay directly resulted in extended project duration.
Additional costs were actually incurred due to the extended duration.
Records (such as site diaries, cost reports, and correspondence) support the claim.
Methods of Evaluation
As-Planned vs. As-Built Analysis – Comparing original schedules with actual progress.
Time Impact Analysis – Assessing the effect of delay events on the critical path.
Cost Impact Assessment – Quantifying costs incurred due to extended duration.
Importance of Prolongation Claims
For contractors, prolongation claims are essential to recovering costs that would otherwise erode profitability. For employers, properly managed claims ensure that compensation is only paid when justified, maintaining fairness and accountability.
Conclusion
Prolongation claims are a common feature in construction projects where extended durations lead to additional costs. Success depends on accurate record-keeping, robust analysis, and clear contractual entitlements. When managed effectively, they provide a fair mechanism for addressing the financial consequences of project delays while maintaining professional relationships between contracting parties.