Which clock is started by the achievement of substantial completion?

The clock for warranty periods is initiated upon the achievement of substantial completion because this milestone signifies that the project is sufficiently complete according to contractual obligations, allowing the owner to occupy and use the space, even if minor details are still pending. Once substantial completion is reached, the warranty period begins to ensure that the owner has a set timeframe during which defects or issues arise due to workmanship or materials can be addressed by the contractor. This aligns with standard practices in construction contracts, where warranties protect the owner after taking possession of the project.

In contrast, the other clocks mentioned relate to different aspects of the construction timeline and contractual responsibilities. The material procurement clock typically runs much earlier in the project timeline, focusing on the ordering and delivery of materials needed before construction starts. The construction start clock is concerned with the actual beginning of construction activities, which precedes substantial completion. The clock for project finalization does not typically begin until after all phases of construction, including the warranty period, have concluded and the project is fully complete.