Final answer:
The statement in question is false; architects or engineers, not contractors, are usually responsible for creating the preliminary estimate during the preliminary design phase of a project.
Step-by-step explanation:
The statement 'Contractors are responsible for preparing the preliminary estimate during the preliminary design phase' is False. It is typically the responsibility of the architects or engineers to prepare the preliminary estimate during the preliminary design phase. Contractors usually come into the process later, once the design is more developed and they are being considered for carrying out the construction. The initial estimates by the design professionals are based on historical data and standardized cost items and aim to guide the project feasibility and budgeting process.