In design-build (DB), a single entity holds both design and construction obligations under one contract with the owner. That single-point structure is what makes DB powerful — and it is also what shifts the risk map decisively away from the owner. This article explains how the DB contract is assembled, where design liability and price risk actually land, and how a healthcare owner writes performance criteria and contingencies so that single-point accountability does not become single-point exposure.

The contract architecture rests on a prime agreement plus a teaming structure beneath it

DB collapses what design-bid-build (DBB) splits into two prime contracts (owner–architect, owner–contractor) into one prime contract: owner to design-builder. Everything else is subordinate to that agreement.

The design-builder can be organized several ways, and the choice determines who carries professional-liability risk internally:

• Contractor-led DB — the general contractor (GC) is the prime; the architect/engineer (A/E) is a subconsultant to the GC. Most common in US healthcare DB. The GC controls the schedule and the money; the design team answers to the builder.
• Designer-led DB — the A/E is the prime and carries the construction trades as subcontractors. Rare for large hospital work; more common on smaller or highly specialized scopes.
• Integrated/joint-venture DB — GC and A/E form a single-purpose entity (an LLC or JV) that is the prime. Used on very large projects to balance control and pool bonding/insurance capacity.
• Developer-led DB — a developer entity holds the prime and subcontracts both design and construction; common in lease-back, medical-office-building (MOB), and P3-style arrangements.

The standard-form families most owners start from are the DBIA documents (Design-Build Institute of America), the AIA A141 owner–design-builder agreement with its A441 design-builder–architect subagreement, and the ConsensusDocs 400 series. DBIA forms are written from a genuinely integrated premise; AIA forms preserve more of the traditional architect's role and are often chosen when the owner wants the A/E to retain a stronger independent voice.

A bridging document defines the owner's intent before the DB price is set

Because the design-builder is buying the design, the owner needs a way to lock intent without drawing the building. That instrument is the bridging documents (also called the owner's criteria or the request-for-proposal design): typically 15–35% design completion prepared by an owner's criteria A/E (the "bridging architect"), establishing program, key adjacencies, departmental gross areas, structural and MEP performance, code path, and the non-negotiables.

The bridging set is the contractual yardstick. Everything the design-builder later produces is measured against it. For healthcare this matters more than in almost any other building type, because the criteria are where the owner embeds the regulatory floor:

• FGI Guidelines edition and the resulting clearances, minimum clear floor areas, and room-by-room requirements (the FGI Guidelines for Design and Construction of Hospital, Outpatient, and Residential Health Care Facilities).
• ASHRAE 170 ventilation parameters — air changes, pressure relationships, filtration, and temperature/humidity ranges per space type.
• Life-safety basis — NFPA 101 (Life Safety Code) and NFPA 99 (Health Care Facilities Code), plus NFPA 110 (emergency power), NFPA 72 (fire alarm/mass notification), and the NFPA 13 sprinkler basis.
• Electrical — NEC Article 517 for health care facilities (essential electrical system, critical/life-safety/equipment branches, wet-procedure-location protection).
• The accreditation and reimbursement overlay — CMS Conditions of Participation (CoP) and the chosen accreditor (TJC or DNV), which determine what "compliant and surveyable" means at occupancy.
• Special-occupancy pharmacy requirements — USP 797 (sterile compounding) and USP 800 (hazardous drugs) for any compounding pharmacy in scope.
• Accessibility — ADA Standards and, on federal projects, ABA.
• The governing IBC edition and the Authority Having Jurisdiction (AHJ) plan-review/inspection path; in plan-review states the state hospital-construction authority (e.g., HCAI, formerly OSHPD, in California) is effectively a second AHJ with its own staged approvals.