Design-build has grown in popularity the last few years since Ohio legislation made it available to public entities. It certainly has its advantages by giving the owner one single point of contact throughout the entire project, as well as providing opportunities for cost and schedule savings. We discussed these particular benefits in a previous blog post here.
Now that the new water treatment plant is complete for the Village of Yellow Springs in Ohio, we would like to share some specific examples of how design-build maximizes project collaboration.
During Design and Preconstruction
Under the design-build umbrella, the construction and design firms work together with the owner to maximize the project budget. Constructability and schedule issues are identified during design and value-added solutions then can be incorporated.
In this case, we continually analyzed various design approaches to ultimately arrive at the most efficient concept ensuring the project stayed within the Village’s borrowing ceiling. One of those enhancements included relocating the new building to minimize yard piping and electrical wiring.
Another advantage of design-build is that the owner has a single point of contact. When design problems arise, the owner is not positioned between the designer and contractor, along with the possibility of added project costs. Design-build usually involves a Gross Maximum Price (GMP) for which the project will be both designed and constructed. In addition, a contingency is used for unanticipated costs and any savings often are shared between the owner and design-builder. This results in a project cost profile that decreases as a function of time, unlike traditional design-bid-build where cost increases with time.
Additionally, we collaborated with the designer to develop a 3D construction sequencing model, specifically as it relates to the concrete pours. This allowed us to not only visualize the placement of the concrete, but how the timing may affect other areas of the project. The 3D model also allowed the client to visualize the interior of the process building and confirm that the design provided ease of operations and maintenance.