The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Neither design-build nor design-bid-build is automatically faster, cheaper, or better for a federal project. Compare them against the project’s requirements, schedule, proposal burden, contractor-team capabilities, and the agency’s capacity to run the procurement—and judge results against original as well as revised baselines.
How the two delivery methods differ
| Factor | Design-build | Design-bid-build |
|---|---|---|
| Contract structure | Design and construction are combined in one contract with one contractor. FAR 36.102 defines it as “combining design and construction in a single contract with one contractor.” | Design and construction are separately contracted and performed sequentially: the design is completed before construction is solicited. |
| Design responsibility and construction solicitation | The contracted team completes design and construction under one contract. The agency can state criteria and preliminary design, budget parameters, and schedule or delivery requirements in its scope of work. | The completed design documents are used to solicit construction bids separately from the design services. |
| Potential schedule effect | Some design and construction work may overlap, depending on the project and its execution. | The sequential structure does not provide the same potential for design and construction overlap. |
| Federal selection approach | For covered federal construction procurements, the contracting officer assesses whether two-phase selection is appropriate, unless design-bid-build or another legally authorized procedure is used. | FAR 36.104 recognizes design-bid-build as an alternative to two-phase selection for covered procurements. |
The federal definitions are in FAR 36.102. The potential for overlap is not a promise of a shorter project: approvals, interfaces, scope, and execution can affect whether it produces a schedule benefit.
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How federal design-build selection works
For a federal contract to design and construct a public building, facility, or work, FAR 36.104 directs contracting officers to use two-phase selection when they determine it is appropriate, unless design-bid-build or another legally authorized procedure is used. Design-build is therefore not compulsory for every federal construction project.
Factors the contracting officer considers
FAR 36.301 identifies factors for assessing whether two-phase selection fits the procurement. They also make a useful comparison checklist for the agency:
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- Whether three or more offers are anticipated.
- How much design work offerors would perform before submitting price or cost proposals, and whether that effort would be substantial.
- How fully the project requirements have been defined.
- The project’s time constraints.
- Potential contractors’ capability and experience.
- Whether the process suits the project and the agency can manage it.
What happens in each phase
- Set the scope and solicitation approach. The solicitation may cover both phases or the agency may issue two solicitations in sequence. The scope of work may identify criteria, preliminary design, budget parameters, and schedule or delivery requirements.
- Evaluate phase one. The agency evaluates technical approach and qualifications, including specialized experience, capability, and past performance of the offeror’s team. Price-related factors are excluded at this stage.
- Limit the pool for phase two. The solicitation states the maximum number of offerors that may advance. Under the FAR, that number normally may not exceed five; exceptions require the applicable process and documentation.
- Seek detailed phase-two proposals and award. The selected offerors submit detailed proposals, and the agency awards one contract using competitive negotiation.
DoD procurements require an additional check of the DFARS provision as well as the FAR. The DFARS page identifies Change Number 5/7/2026, effective May 7, 2026. For contracts above $5.5 million, it generally limits the phase-two pool to five, unless the solicitation is for a qualifying indefinite-delivery indefinite-quantity design-build contract or an authorized official approves and documents a larger pool for an individual solicitation. Confirm the rule’s applicability to the specific procurement.
Which method fits the project?
Use the project’s constraints—not a blanket preference for one method—to frame the decision. The FAR’s two-phase selection factors point to the questions below.
Are the requirements defined well enough?
FAR 36.301 explicitly includes how fully the project requirements are defined. If the agency needs to complete and review detailed design documents before it solicits construction, separate sequential contracting may align with that preference. If it can specify criteria and constraints while leaving the team to complete the design, design-build may be a fit. The agency still needs to define what it expects to receive and how it will evaluate proposals.
Does the schedule make overlap valuable?
FAR names time constraints as a selection factor. Design-build can allow some design and construction activities to overlap, but the practical value depends on the project’s scope, approvals, interfaces, and execution. Treat acceleration as a possibility to evaluate, not as a guaranteed result or a general FAR promise.
How much proposal effort will offerors have to absorb?
The FAR specifically calls out design work before price or cost proposals and whether offerors face substantial proposal expense. Significant unpaid design effort can affect the practicality of the competition. Consider whether the requested phase-one and phase-two work is proportionate to the procurement and whether the agency can assess the proposals it asks firms to produce.
Can the agency evaluate teams and administer the process?
Two-phase selection relies on evaluating technical approach and team qualifications before price-related factors enter the process. The FAR also directs attention to potential contractors’ capability and experience, the suitability of the procedure, and the agency’s own ability to manage it. A procurement is only workable if the agency has the capacity to define its criteria, evaluate submissions, and administer the selection.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the outcome evidence shows—and does not show
Available comparative findings are historical and tied to particular project types and samples. They can inform questions to ask, but they do not establish a universal federal winner.
Federal-aid highway findings
The Federal Highway Administration’s 2005 Design-Build Effectiveness Study examined the Federal-aid highway program, using project surveys and a limited set of similar design-bid-build projects. In that comparison, design-build projects had 9 percent less total project duration and 13 percent less construction-phase duration. The study also found mixed cost effects depending on project type, complexity, and size. These historical highway findings are not a current forecast for federal buildings or other construction categories.
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A related review of the study reported average durations of 583 days for design-build and 1,215 days for design-bid-build in a 14-observation comparison. For its cost comparison, it found no significant difference in mean cost across six observations. Those small, historical samples do not support a categorical prediction about a new project.
Why baseline history matters
A 2019 Government Accountability Office review of GSA major construction projects is not a head-to-head comparison of delivery methods. It found that GSA had rebaselined 25 of the 36 projects reviewed for fiscal years 2014–2018. That is a reason to report performance against both original and revised cost and schedule baselines, then state final cost and completion: reporting only against a revised baseline can hide how the project’s expectations changed. The review does not establish that either delivery method caused those project outcomes.
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