48 C.F.R. §§ 52.211-10
As prescribed in 11.404(b), insert the following clause in solicitations and contracts when a fixed-price construction contract is contemplated. The clause may be changed to accommodate the issuance of orders under indefinite-delivery contracts for construction.
Commencement, Prosecution, and Completion of Work (APR 1984)
The Contractor shall be required to (a) commence work under this contract within __ [Contracting Officer insert number] calendar days after the date the Contractor receives the notice to proceed, (b) prosecute the work diligently, and (c) complete the entire work ready for use not later than __*. The time stated for completion shall include final cleanup of the premises.
(End of clause)
*The Contracting Officer shall specify either a number of days after the date the contractor receives the notice to proceed, or a calendar date.
Alternate I (APR 1984). If the completion date is expressed as a specific calendar date, computed on the basis of the contractor receiving the notice to proceed by a certain day, add the following paragraph to the basic clause:
The completion date is based on the assumption that the successful offeror will receive the notice to proceed by __ [Contracting Officer insert date]. The completion date will be extended by the number of calendar days after the above date that the Contractor receives the notice to proceed, except to the extent that the delay in issuance of the notice to proceed results from the failure of the Contractor to execute the contract and give the required performance and payment bonds within the time specified in the offer.
48 C.F.R. §§52.211-10