Final answer:
The process is known as tendering or competitive bidding, where builders request bids from contractors for various construction project segments like excavation, framing, and roofing.
Step-by-step explanation:
The process you're referring to, where a builder requests bids from several contractors for different parts of a construction project, is commonly known as tendering or competitive bidding. Each contractor will submit a proposal or a bid outlining their plan to complete the work required for a portion of the construction, such as excavation, framing, or roofing.
This allows the builder to compare costs, schedules, and the work quality promised by each bidder and select the best option for each segment of the building project. The building is constructed from the ground up, starting with the foundation and proceeding in a systematic manner to complete the structure in a logical sequence up to the roof.