Completing a project within the scheduled time is one of the most challenging constraints in project management, and it is an area where many projects fail. Projects are delayed due to a series of faults by various entities involved in the project. However, delays in project completion not only create scheduling complications but also have serious cost implications, and the party at fault is generally required to bear the financial consequences. If a delay is incurred due to the owner's fault, unforeseen events, or a series of excusable events that cannot be mitigated within the contract completion period, the contractor may be entitled to additional time or both additional time and monetary compensation, depending on the contract provisions, as discussed in another blog.
However, if the delays are non-excusable, it is the contractor's responsibility to mitigate them through crashing (adding extra resources) or accelerating the work (increasing working hours) to meet the contractual deadline. For the owner, substantial completion is a major milestone because it provides occupancy of the building and effectively transfers the completed project for its intended use. If, for any reason, the contractor fails to achieve substantial completion by the contractual deadline, a significant financial penalty known as liquidated damages (or delay damages) is applied.
Generally, the liquidated damage is around 1% of the contract amount per day, or as specified in the contract. For example, if the contract value is $100 million, a one-day delay in achieving substantial completion could result in a penalty of $1 million. From my experience, almost every construction contract includes this special condition because it protects the owner from the financial implications of late handover and encourages the contractor to adhere to the project schedule.
At substantial completion, all major construction activities are completed, including obtaining the required building permits. The only remaining work typically consists of punch-list (snagging and de-snagging) items and the document handover process. Technically, the owner considers the building ready for occupancy, all equipment is operational, and prospective tenants or buyers are allowed to inspect or occupy the units. Therefore, delaying substantial completion can result in significant financial penalties for the contractor.
Final completion is typically achieved one to three months after substantial completion and is also an important contractual milestone. Delays in achieving final completion may result in additional penalties, which can accumulate to up to 10% of the total contract amount, depending on the contract terms. Therefore, contractors should focus on completing the project on time to protect themselves from substantial financial penalties. In many cases, the risk of these penalties is transferred to or shared with the subcontractors responsible for the delay. However, if the contractor closely monitors the project from an early stage and takes timely corrective actions, the risk of project delays and associated penalties can be significantly reduced.

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