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Design-build puts design and construction in one contract with one contractor; design-bid-build procures them separately and sequentially. For a federal project, neither method is automatically faster or cheaper. The better fit depends on how clearly the agency can define its requirements, the value of overlapping work, the design effort expected from offerors, and the agency’s ability to evaluate and manage the procurement.
What design-build and design-bid-build mean
The Federal Acquisition Regulation (FAR) defines design-build as “combining design and construction in a single contract with one contractor” (FAR 36.102). In design-bid-build, design and construction are sequential and separately contracted: the agency completes design documents, then solicits construction bids using them.
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| Feature | Design-build | Design-bid-build |
|---|---|---|
| Contract structure | One contract covers design and construction. | Design and construction are contracted separately. |
| Sequence | Some design and construction work may overlap, depending on the project and its approvals. | Construction follows the completed design and its separate procurement. |
| What the agency solicits | Requirements, criteria, preliminary design, budget parameters, and schedule or delivery requirements may define the desired outcome while leaving the team to complete design and construction. | Completed design documents provide the basis for a separate construction solicitation. |
| Main procurement question | Can the agency define outcomes and constraints well enough to solicit and evaluate an integrated team? | Does the agency prefer to complete and review detailed design before seeking a construction contractor? |
Potential overlap is a scheduling opportunity, not a guarantee of a shorter project. The value depends on the scope, approvals, interfaces, and execution.
How federal two-phase design-build selection works
FAR 36.104 directs contracting officers to use two-phase selection for federal contracts to design and construct a public building, facility, or work when they determine the procedure is appropriate, unless design-bid-build or another legally authorized procedure is used. Design-build is therefore an available federal approach, not a mandatory choice for every construction project.
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Under FAR 36.301, the contracting officer considers factors including anticipated competition of three or more offers, the amount of design effort and proposal expense before price or cost proposals, how fully the requirements are defined, time constraints, potential contractors’ capability and experience, the suitability of the process, and the agency’s ability to manage it.
- Set the solicitation approach. The agency may cover both phases in one solicitation or issue two solicitations in sequence. The scope may state criteria and preliminary design, budget parameters, and schedule or delivery requirements.
- Evaluate phase one. The agency assesses technical approach and qualifications, which can include specialized experience, capability, and past performance of the offeror’s team. Price-related factors are excluded from this phase.
- Limit the pool advancing to phase two. The solicitation states the maximum number of offerors that may advance. FAR normally caps that number at five, subject to an exception process and documentation requirements.
- Request detailed phase-two proposals and award. The selected offerors submit detailed proposals, and the agency awards one contract using competitive negotiation.
Additional DoD rule to check
For Department of Defense procurements, check the applicable DFARS provision as well as the FAR. The DFARS page identifies Change Number 5/7/2026, effective May 7, 2026. It states that, for contracts above $5.5 million, the phase-two pool generally may not exceed 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 whether this rule applies to the specific procurement.
Compare the methods against the project and the agency
How well can the agency define the requirements?
FAR expressly makes the extent to which requirements are adequately defined relevant to assessing two-phase design-build. If the agency wants to finish and review detailed design before it procures construction, the separate, sequential design-bid-build structure may fit that preference. If it can specify outcomes and constraints while leaving design completion to an integrated team, design-build may be workable.
What does the schedule require?
Time constraints are another FAR consideration. Overlapping design and construction may help when schedule pressure is important, but the agency should assess where overlap is feasible and what approvals or project interfaces could limit it. The method alone does not establish a delivery date.
How much proposal design work will offerors perform?
FAR calls attention to design work before price or cost proposals and whether offerors will incur substantial proposal expense. The agency should weigh that burden when setting phase requirements: extensive design effort can make the competition more costly for participants and affect how practical the selection process is.
Can the agency evaluate the team and run the process?
Two-phase selection requires the agency to assess technical approach and team qualifications first, then solicit and evaluate detailed proposals from the firms selected. FAR includes both prospective contractors’ capability and experience and the agency’s own ability to manage the procedure among its considerations. The procurement plan should match the agency’s evaluation and administration capacity.
What evidence will show whether the project succeeded?
Set a way to report performance against the original cost and schedule baselines as well as any revised baselines, final cost, and final completion. Reporting only against a later baseline can obscure changes to the original plan.
What the published outcome evidence does—and does not—show
The available comparisons are historical and context-specific. They can inform questions to ask, but they do not establish a universal schedule or cost advantage for federal buildings or for a new project in another construction category.
Best Value
| Evidence | Reported result | How to interpret it |
|---|---|---|
| Federal Highway Administration (FHWA), 2005, Federal-aid highway study | Design-build projects were shorter by a reported 9% in total project duration and 13% in construction-phase duration in the study’s comparison. | These are historical highway-study findings, not a forecast for federal buildings or every construction category. The study reported mixed cost effects depending on project type, complexity, and size. |
| FHWA study review, 2005 | In a 14-observation review, average duration was 583 days for design-build and 1,215 days for design-bid-build. The cost comparison used six observations and found no significant difference in mean cost. | The small historical samples limit how far these figures can be generalized to another project. |
| U.S. Government Accountability Office (GAO), 2019 | GAO found that GSA rebaselined 25 of the 36 major projects it reviewed, covering projects completed in fiscal years 2014–2018. | This was not a head-to-head delivery-method study. The finding supports tracking original and revised baselines; it does not show that either delivery method caused the reported project outcomes. |
A practical selection test
Before choosing, document the answers to these project-specific questions:
- Can the agency describe the required outcomes, constraints, and preliminary design well enough for the proposed procurement?
- Would schedule pressure make feasible design-and-construction overlap valuable?
- How much design work and proposal expense will firms incur before submitting price or cost proposals?
- Can the agency assess the competing teams’ technical approaches, capability, experience, and past performance, then manage the planned phases?
- How will the agency preserve and report original baselines, later revisions, final cost, and final completion?
If the answers favor integrated responsibility and the agency can run a suitable two-phase competition, design-build may be a fit. If the agency’s priority is to complete and review the design before separately procuring construction, design-bid-build may align better. Neither conclusion should be treated as a general performance guarantee.
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