Progressive Design-Build

Progressive design-build is a variant of design-build in which the contractor is selected primarily on qualifications during a first phase, advances the design through a defined milestone in a second phase under contract with the owner, and then either continues into construction at a negotiated GMP or exits while the owner re-bids the construction. The structure is a hybrid: it borrows the qualifications-based selection from CMAR and the integrated design-and-construction responsibility from traditional design-build.

The contrast with lump-sum design-build is structural. Under lump-sum design-build, the contractor commits to a fixed price for the design and construction at procurement, before significant design work has happened. Under progressive design-build, the price is established later, after the design has progressed enough to support a defensible price. The contractor still owns the design, but the pricing risk is bounded by the progressive structure rather than absorbed at procurement.

The method has gained particular traction on water and wastewater infrastructure, on transportation projects with significant scope uncertainty, and on certain federal civilian infrastructure where the owner wants design-build integration but is uncomfortable asking bidders to price work that has not been designed yet. The Design-Build Institute of America has been the primary industry advocate for the method, and DBIA publishes contract documents specifically for progressive delivery.

Phase 1: qualifications and selection

The owner selects a single design-build team primarily on qualifications. The selection is similar in structure to a CMAR selection: the team submits a qualifications-based proposal, the owner evaluates the team’s capability and approach, and the owner picks the team it wants to work with. Price is not the primary selection criterion in Phase 1; the team’s fee structure for the second phase may be part of the proposal, but the dominant evaluation is qualifications-based.

Phase 2: design progression and GMP development

The selected team enters Phase 2 under contract with the owner. The team progresses the design from the conceptual or preliminary state at selection toward the design milestone where the GMP will be established (commonly 60% to 90% design depending on the project type and the contract). During Phase 2 the team is paid for the design work performed and for any preconstruction services the contract calls for.

At the design milestone, the team and the owner negotiate the GMP for the construction phase, similar in structure to a CMAR GMP negotiation. The GMP build-up reflects the design at the milestone, the construction approach the team has developed, the subcontractor pricing the team has gathered, and the contractor’s contingencies and fee. If the GMP is acceptable, the team continues into construction. If the GMP is not acceptable, the off-ramp provisions in the contract govern what happens next.

Construction phase

Construction proceeds under the GMP, with the team performing both the remaining design work (completing the design from the GMP milestone through 100% construction documents) and the construction. The structure during construction is functionally similar to traditional design-build construction at GMP, with the team carrying both design and construction responsibility through to project completion.

The off-ramp is the provision that lets the owner exit the relationship if the GMP negotiation does not produce an acceptable price. The off-ramp is the protection that supports the qualifications-based selection: an owner that selects a team without a competitive price commitment up front needs an exit if the eventual price is unacceptable.

What the off-ramp typically covers

Off-ramp provisions vary, but common elements include: a defined right of the owner to decline the GMP without cause, a requirement that the team turn over its design work to the owner upon exit (typically with a payment for the design work performed and a license to use the design for the owner’s subsequent procurement), and a procedure for the owner to procure the construction through a different mechanism (typically design-bid-build using the team’s design as the bid documents) after the off-ramp is exercised.

When the off-ramp is exercised

The off-ramp is rarely exercised in practice. The qualifications-based selection produces a team the owner has confidence in, the open-book design progression keeps the owner informed about cost trends throughout Phase 2, and the GMP negotiation is informed by months of shared cost data. By the time the GMP is on the table, both parties have invested enough in the relationship and have enough alignment on the cost picture that workable terms are usually reached.

The off-ramp matters anyway. The contractual right gives the owner leverage during the GMP negotiation that supports defensible pricing, and the existence of the option helps the team approach the negotiation knowing the owner has alternatives. Negotiations that happen in the absence of any owner alternative tend to play out differently than negotiations where the owner has a real off-ramp.

Contractor exposure on the off-ramp

From the contractor’s side, the off-ramp is exposure that has to be priced into the Phase 1 fee structure and the Phase 2 design effort. A contractor whose team performs months of design work, develops subcontractor relationships for the project, and invests heavily in the bid-stage and Phase-2 effort, only to have the owner exercise the off-ramp, has lost the construction work and the construction-stage fee. The Phase 2 design payment covers the contractor’s direct cost on the design but does not cover the construction-stage opportunity that has now disappeared.

Water and wastewater infrastructure

Public water and wastewater agencies have been the most active adopters of progressive design-build. The method works well for water-treatment plant construction, large pipeline projects, and similar infrastructure where the design has substantial uncertainty at the start, the owner wants a team partner through design, and the project economics support paying for design progression in the structured way the method requires. WIFIA-financed water projects have used progressive design-build at scale on multiple major utilities’ capital programs.

Transportation infrastructure

State DOTs and transit authorities have used progressive design-build on selected projects, particularly large transit-station construction and complex highway interchange work where the scope is too uncertain for traditional lump-sum design-build but the owner still wants the design-build integration. The transportation adoption has been more measured than the water-sector adoption; many state DOTs continue to use traditional lump-sum design-build as the default and reserve progressive structures for specific project types.

Federal civilian infrastructure

Some federal civilian agencies have used progressive design-build on specific projects where the structure fits the procurement need. Adoption is project-specific rather than program-wide. Federal design-build remains predominantly lump-sum or two-step traditional design-build under FAR Part 36.3.

Vertical building work

Progressive design-build is less common on vertical building construction than on horizontal infrastructure, partly because vertical building procurement has substantial CMAR adoption that fills a similar role and partly because the design uncertainty on standard building types is bounded enough to support traditional design-build pricing. Some institutional owners (universities, healthcare systems) have used progressive design-build on specific complex projects.

Building a progressive design-build practice asks for capabilities that traditional design-build practice does not need at the same depth. Most contractors that pursue progressive work are firms with both established CMAR and design-build practices, blending the muscle from each into the structure progressive requires.

Phase 1 proposal capability sits closer to a CMAR proposal than to a traditional design-build proposal. The qualifications focus, the team-selection emphasis, and the relationship-driven evaluation pattern are all CMAR-flavored. Contractors with strong CMAR practices have most of what they need on the proposal side; contractors with only lump-sum design-build experience often find their proposal approach is calibrated to the wrong evaluation.

Phase 2 design progression asks the design partners to advance the design under a structure that is different from both traditional design-build and CMAR. The design firm is contracted through the design-build entity rather than directly to the owner, but the design progression is collaborative with the owner in a way more characteristic of CMAR than of traditional design-build. The design firm’s preconstruction-services-style billing, the open-book design progression, and the GMP-supporting design work are all hybrid practices that not every design firm is equally comfortable with.

GMP-development capability is the centerpiece. The contractor has to develop a defensible GMP from the design at the milestone, with the cost data, market pricing, sub bids, and contingency analysis that the GMP negotiation requires. This is the same capability CMAR contractors have built, but on a different timeline and against a different design-completion baseline.

The bid-side documentation discipline applies the same way it does on traditional design-build, with the substance reflecting the progressive structure. The Phase 1 proposal is a qualifications-based response built around the owner’s evaluation factors. The compliance matrix tracks the procurement’s evaluation criteria. The action checklist captures the contractor-supplied items the procurement requires. The ScalaBid Submission Packageon a progressive design-build procurement is structured to the actual delivery method and the actual evaluation factors, with the proposal narrative scoped to the qualifications-based Phase 1 selection rather than to the full design-build response a traditional procurement would call for. The structural difference is in the proposal’s emphasis; the production discipline is consistent across all the design-build variants.