What Is Progressive Design-Build Delivery?
Progressive design-build selects the design-builder on qualifications (not price), then develops the design and the price collaboratively — the owner and the design-builder progress toward a guaranteed maximum price together, with off-ramps if they cannot agree. The delivery method for complex projects where the scope cannot be fully defined upfront: water plants, transit, hospitals. Collaboration first, price second.
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How it works
Phase 1 (preconstruction services): the selected design-builder works with the owner developing the design to 30-60%, open-book pricing the packages, value-engineering, and identifying risks — the owner pays for the collaboration. Phase 2 (the GMP amendment): the parties agree on the guaranteed maximum price and the design-builder builds it — with off-ramps (if the GMP negotiation fails, the owner keeps the design and procures construction separately). The two-phase structure aligns incentives: the builder profits from efficiency, not from change orders.
Advantages
Early contractor involvement (constructability, pricing feedback, and schedule input during design — the classic design-build benefit without the low-bid adversarial dynamic), risk transparency (the open-book pricing and the jointly developed risk register — the owner sees the contingencies), and speed (early work packages procured during design development — the fast-track). Owner control (the owner shapes the design before the price locks — unlike hard-bid design-build).
When to use it
Complex, scope-uncertain projects (water/wastewater plants, transit systems, hospital renovations — where the existing conditions or the process requirements resist fixed-price bidding), owners with the sophistication to collaborate (the method needs an engaged owner — passive owners get passive results), and schedule-driven projects (the early packages compress the timeline). The qualifications-based selection (the design-builder's team, approach, and past performance — not the low price) is the method's foundation. Growing adoption in public procurement (many states now authorize it).
The bottom line
Progressive design-build selects on qualifications, develops design and GMP collaboratively (with off-ramps), then builds. Ideal for complex, scope-uncertain projects needing early contractor involvement.
Torch Engineering PLLC · (480) 490-0064 · info@torchengineering.com — PE stamping backed by Apex Grid Engineering.