Final answer:
The four main project delivery methods include Design-Bid-Build, Design-Build, Construction Manager at Risk, and Integrated Project Delivery, each with distinct approaches to designing and building a project.
Step-by-step explanation:
The four main project delivery methods commonly used are: Design-Bid-Build, Design-Build, Construction Manager at Risk (CMAR), and Integrated Project Delivery (IPD). These methods have unique characteristics and are chosen based on the project’s specific needs, goals, and constraints.
In Design-Bid-Build, the project owner first completes the design with architects or engineers, then contractors bid on the work, with the project usually going to the lowest bidder. In Design-Build, one entity is responsible for both designing and building, which can speed up completion and create efficiencies. Construction Manager at Risk involves a construction manager who is engaged by the owner to provide input on the design and then take responsibility for construction, committing to a maximum price.
Lastly, Integrated Project Delivery entails close collaboration among all stakeholders from the early stages, with shared risks and rewards which promotes a highly collaborative environment.