The official written go-ahead from the owner telling the contractor to start work.
A notice to proceed (NTP) is a written communication from the owner authorizing the contractor to begin work on a project. It establishes the official start date for the contract period and triggers the running of the project schedule. Contractors should not mobilize or incur project costs before receiving a written NTP.
The contractor received the notice to proceed on April 1, setting the substantial completion deadline at October 15.
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