In the context of design build, what does the term 'progressive design build' refer to?

Progressive design-build is characterized by the development of design and pricing after the contractor has been engaged, allowing for a more collaborative approach between the owner and the design-build team. This model allows for flexibility throughout the design process, enabling adjustments based on feedback, budget considerations, and evolving project requirements.

In progressive design-build, the contractor is involved early in the project lifecycle, which facilitates a more integrated approach where design decisions can be informed by construction feasibility, cost implications, and innovative solutions. This approach contrasts with more traditional methods where final project parameters must be established prior to contractor selection, limiting the ability to adapt to new insights gained during the design phase.

Options that require fixed project costs and schedules beforehand do not align with the progressive design-build philosophy, as this flexibility is fundamental to its effectiveness. Similarly, requiring complete plans and specifications before bidding does not support the iterative, collaborative nature that progressive design-build encompasses. Lastly, while focusing solely on owner-defined performance requirements may have its benefits, it does not capture the essence of progressive design-build's emphasis on collaboration and iterative development with the contractor.