Design-Build

Design-build is a construction project delivery method in which the federal government awards a single contract to one entity, the design-builder, that is responsible for both the design and construction of the facility, accepting unified accountability for cost, schedule, and quality outcomes.

What is Design-Build in Federal Contracting?

Design-build emerged as a federal procurement method to overcome the principal limitation of design-bid-build: the sequential nature that forces the government to wait for 100% complete design documents before soliciting construction bids, extending total project delivery time by 12 to 24 months on large projects.

Under design-build, the government issues performance-based requirements (a program document, concept drawings, or bridging documents) rather than complete construction documents. The design-builder responds with a technical proposal including its design approach, project team, schedule, and a lump-sum price. Source selection evaluates both technical merit and price rather than price alone.

FAR 36.3 specifically governs the two-phase design-build selection process used for federal projects. Phase 1 establishes a shortlist of three to five offerors based on qualifications, experience, and preliminary design concepts. Phase 2 solicits full technical proposals and firm pricing from the shortlisted firms. This two-phase approach limits the enormous proposal preparation costs that would otherwise make design-build unaffordable for smaller firms.

The design-builder assumes responsibility for coordinating its own A/E firm with its construction crews, resolving design-construction conflicts internally rather than through government change orders. This transfers significant risk from the government to the contractor, making pricing strategy and risk assessment critical for design-build proposals.

NAVFAC and the Corps of Engineers use design-build extensively for military construction (MILCON). The General Services Administration increasingly favors design-build for federal buildings when schedule is a priority.

Why Design-Build matters for government contractors

Design-build offers higher margins than design-bid-build because price competition occurs before design is complete, giving contractors more pricing flexibility. The downside is significantly higher proposal costs (design fees invested in losing proposals) and greater performance risk. Firms pursuing design-build must have either in-house design capability or a strong A/E teaming partner.

Example

NAVFAC issues a two-phase design-build solicitation for a $200M Marine Corps barracks complex. Phase 1 shortlists four general contractors based on design-build experience and preliminary concepts. In Phase 2, the four firms submit detailed technical proposals with firm pricing. The winner, proposing an innovative modular construction approach that compresses the schedule by six months, is selected through best value tradeoff despite not being the lowest price.

Frequently Asked Questions

Is design-build faster than design-bid-build?

Generally yes. Construction can begin on early site work and foundations while design is being finalized for later phases of the project. Total delivery time (from contract award to building occupancy) is typically 20-30% shorter than design-bid-build for comparable projects.

What is a bridging document in design-build procurement?

A bridging document is a partial design (typically 30-60% complete) that the government develops before soliciting design-build proposals. It provides enough design definition for contractors to price the work accurately while still leaving design decisions for the design-builder to optimize. Bridging documents reduce pricing risk compared to pure performance-specification-based solicitations.

Can small businesses compete for design-build contracts?

Yes, though the combined financial, bonding, and technical demands make design-build more challenging for small businesses than design-bid-build. Small businesses often participate as part of a design-build team led by a larger general contractor, with the small business performing a defined scope of work within the integrated team.

Who bears responsibility if the design has errors in design-build?

The design-builder, since it controls both design and construction, design errors are its contractual responsibility. This is a fundamental difference from design-bid-build, where the government's A/E bears responsibility for design defects. Design-builders carry professional liability (errors and omissions) insurance to cover this exposure.