In this model, the builder enters into a separate contract with the project's designer and contractor. The builder has the advantage of receiving early advice on design, cost, schedule and construction options throughout the design process. This advice gives the builder the opportunity to adjust project costs, project scope and delivery. The builder's involvement is as large or as small as e builder wishes. Based on the design, the contractor provides a price and detail on the proposed quality of work, along with a completion date. The design and construction phases may overlap.

Benefits and insights:

1. The building principal may use additional services such as: 
          Feasibility studies
          Valuation
          Life cycle costing
          
2. Time can be saved since the contractor can begin construction before the design is complete. The foundation and structural work, for example, can already take place when interior designers complete their design.

3. Architects' and engineers' fees can be reduced by engaging the contractor at an early stage.

4. Construction management costs are established at the start of the project.

5. Construction costs are minimized by including review moments at regular intervals. In addition, the contractor knows his trade; he knows which materials, construction methods and systems are more cost-effective. 

6. Capital costs can be reduced, thanks to clearer and better coordinated construction documents, minimizing change orders that affect both cost and time.

7. Misunderstandings between the parties are minimized when the IPA team works well together during the planning stages of the project.

8. Builder risk is minimized and shared with the contractor.