Design-Build

Core components

• Single-entity responsibility: design-builder provides both design and construction under single contract
• Design-builder structures: contractor with in-house design capability (most common)
• contractor-designer joint venture
• designer-led design-build (less common)
• Owner relationships: owner has single contract with design-builder
• owner's typical roles include programming, design review, construction monitoring (often through owner's representative or program manager)
• Project delivery variants: Progressive Design-Build (collaborative design and price development through milestones), fixed-price Design-Build (lump sum after RFP/proposal phase), Bridging (owner develops preliminary design then competes DB), Engineering-Procurement-Construction (EPC) for industrial projects
• Selection methods: best-value selection (qualifications and price), low-bid selection (less common in DB), qualifications-based selection (some progressive-DB and professional-services-style)
• Risk allocation: design-error risk shifted to design-builder (substantial contrast with DBB)
• construction-execution risk on design-builder
• site-conditions and differing-conditions risk varies by contract
• Performance specifications versus prescriptive specifications: DB facilitates performance-based specifications enabling design-builder innovation
• AIA contract documents: A141 Owner-Design-Builder, A142 Design-Builder-Subcontractor
• DBIA contract documents and supplemental forms
• Common application contexts: transportation infrastructure (state DOTs), federal facilities, healthcare, industrial EPC projects, prefabricated and modular construction

Primary use case

Construction-delivery method with substantial growth in US construction since 1990s, applied principally in: transportation infrastructure (highway, bridge, transit projects under state DOT and FHWA frameworks); federal government construction (post-Clinger-Cohen Act facilitation); healthcare facility construction; industrial and energy projects (typically through EPC variant); performance-driven projects where owner specifies outcomes rather than design specifics; schedule-critical projects benefiting from design-construction overlap; private-sector commercial construction; academic and professional reference in construction management, project management, and public-procurement literature; DBIA certification, training, and professional infrastructure; international diffusion through global EPC contracting tradition and local design-build adaptations.

Common criticisms

• DB's consolidation of design and construction responsibility under a single entity has been substantially debated — supporters argue this aligns incentives and reduces design-construction interface conflicts, while critics argue it eliminates the independent-designer check-and-balance that protects owner interests against contractor cost-cutting decisions
• the design-builder's economic incentive to produce designs that minimize construction cost may produce designs less optimized for owner's long-term operational and life-cycle interests, with documented concerns about value engineering decisions favoring contractor margin over owner interests
• performance specifications enable design-builder innovation but also enable design-builder shortcuts that performance criteria do not adequately constrain
• quality-control infrastructure differs from DBB — DBB's independent designer provides ongoing construction-administration review, while DB's same-entity design-construction structure produces less independent oversight, which owners typically address through owner's representative or independent peer review at substantial additional cost
• selection methodology is contested — best-value selection (qualifications plus price) is broadly preferred but its specific scoring criteria can be manipulated, while low-bid selection produces 'race-to-the-bottom' similar to DBB
• substantial empirical evidence (Konchar-Sanvido 1998, El Asmar et al. 2013, FHWA studies) documents DB performance advantages over DBB on cost growth, schedule growth, and unit cost — though selection bias and project-complexity confounds limit confident generalization
• public-procurement enabling legislation varies substantially across US states, producing fragmented DB landscape
• small-business and local-business participation can be reduced under DB structure since only large integrated firms can typically respond
• owner-program-manager and owner-representative roles have grown substantially as compensation for the reduced independent-design oversight DB inherently provides, producing additional cost layer
• integration with sustainability requirements (LEED, energy codes) and accessibility codes places substantial design-builder responsibility for compliance that may produce documentation gaps
• ongoing growth of Progressive Design-Build addresses some traditional DB concerns while producing its own contractual complexity.