Design-Bid-Build (DBB) is the traditional, sequential delivery model: the owner finishes design with an architect/engineer (A/E), then competitively bids construction to a general contractor (GC) who builds to completed documents. This article covers the decision — when DBB is the right fit for a healthcare project, when it is the wrong fit, and the trade-offs an owner accepts by choosing it. (Model mechanics, contract/risk structure, healthcare-specific code interactions, and the procurement path itself are covered in sibling Articles.)

DBB fits well-defined, low-complexity scope

DBB is at its best when the scope can be fully drawn before a price is needed. The model assumes the design is essentially complete at bid — the GC prices a finished set, not a moving target. That assumption holds for projects where the program is stable, the systems are conventional, and the unknowns are few.

Strong-fit healthcare scenarios typically share these traits:

• Stable, well-understood program. A medical office building (MOB) shell, a clinic fit-out to a repeated prototype, an administrative or support building, a parking structure, or a central-utility-plant replacement where the equipment basis-of-design is settled.
• Conventional systems with mature design. Standard HVAC, normal-power and limited essential-electrical scope, ordinary plumbing — not a complex mix of pressure-relationship suites, isolation rooms, or specialized imaging shielding that benefits from early trade input.
• Low likelihood of mid-project program change. The clinical service line, bed count, or room mix is locked; the owner is not still negotiating equipment vendors or operational workflows during design.
• Renovation with a clean, documented existing condition. Where as-builts are reliable and the phasing is simple, DBB's lack of early builder input costs less.
• A schedule that tolerates sequential phasing. Design completes, then bidding runs, then construction starts. No overlap is built in, so the calendar must have room for three phases end to end.

When these conditions hold, DBB delivers the clearest competitive price, the simplest contractual map, and the least process overhead.

DBB is a poor fit for complex, fast, or evolving healthcare scope

The same assumptions that make DBB efficient on simple work make it fragile on complex work. Where the design cannot be fully resolved before construction must begin, or where builder knowledge would materially improve constructability, DBB's sequential structure works against the owner.

Weak-fit signals:

• High clinical and systems complexity. Inpatient towers, surgical suites, interventional and imaging platforms, sterile compounding (USP 797/800) pharmacies, and emergency departments carry dense infection-control, pressurization (ASHRAE 170), life-safety (NFPA 99/101), and essential-electrical (NFPA 110, NEC 517) requirements where early trade and equipment coordination reduces rework. DBB excludes that coordination by design.
• Schedule pressure requiring overlap. When the owner needs construction to start before design is 100% complete — to hit a service-line launch, a lease deadline, or a grant/bond milestone — DBB's no-overlap sequence is a liability. Models that allow early packages (CMAR, DB) fit better.
• Significant unknowns or evolving program. Major renovations in occupied facilities with uncertain existing conditions, or projects where the clinical program is still maturing, invite the change orders DBB handles poorly.
• Owner desire for early, reliable cost certainty. DBB's price is firm only at bid — late in the process. Owners who need an early guaranteed maximum price (GMP) to secure financing or board approval are better served by a model with preconstruction pricing.
• Heavy first-time-quality and commissioning demands. Where startup, integrated systems testing, and Authority Having Jurisdiction (AHJ) / accreditation (TJC or DNV) readiness are make-or-break, the builder's absence during design raises the risk of discovering coordination gaps in the field.

In these cases the lower first cost of DBB is frequently erased — and exceeded — by change orders, schedule extensions, and dispute costs.

The core trade-off: lowest first cost vs. least flexibility and collaboration