Under CCDC terms, how many calendar days does a consultant have to inform about substantial performance?

The correct choice regarding the time frame a consultant has to inform about substantial performance, according to the Canadian Construction Documents Committee (CCDC) terms, is 20 days. This period is critical as it allows the consultant to assess the project's completion status concerning certain contract requirements.

Substantial performance is an important milestone in a construction project, as it signifies that the work is sufficiently complete according to the contract that the owner can occupy or utilize the building for its intended purpose. The 20-day notification period ensures that all parties are properly informed, which is essential for the management of timelines, accountability, and the commencement of the warranty period and other legal implications that follow substantial performance.

Thus, understanding the timeline outlined in the CCDC documents ensures that project stakeholders adhere to the contractual obligations that govern the project's progress and resolution.