Often, yes—but design-build is not an automatic schedule guarantee. By placing design and construction under one owner contract, it can reduce handoff delays, bring constructability decisions forward, and allow selected construction work to overlap with design. Whether that produces an earlier opening still depends on scope clarity, owner decisions, permitting, procurement, site conditions, and execution.
The strongest comparative evidence is a 2018 study by the Construction Industry Institute (CII) and the Charles Pankow Foundation. Its results, summarized by the Design-Build Institute of America (DBIA), show faster delivery and lower growth measures for the design-build projects in its historical sample. Those percentages describe the studied projects; they are not a promise that a new project will achieve the same result.
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What “faster” means in a delivery-method comparison
Owners use “faster” to describe at least two different intervals:
- Total delivery: the period from the start of design through project completion or handover.
- Construction duration: the field-construction period after work starts on site.
A delivery method can shorten the total calendar even when the physical construction period changes only modestly, because design, procurement, permitting, and early construction packages may be sequenced differently. A credible comparison must therefore identify which interval a statistic measures.
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Percentages described as “faster” are relative comparisons between groups of projects. They should not be converted directly into a promised percentage reduction in your calendar. For example, a project that is reported as faster on a relative index is not automatically expected to take the same proportion fewer months.
How the three delivery methods differ
Design-build
In design-build, the owner signs one principal contract covering both design and construction. The design-builder coordinates the architect or engineer, construction teams, subcontractors, procurement, and much of the sequencing. The owner still defines requirements, approves key decisions, provides information, and retains the responsibilities assigned by the contract, but there is one primary commercial relationship for delivering the project.
Design-bid-build
Design-bid-build (DBB) separates the design and construction contracts. The owner generally completes design documents, solicits competitive construction bids, and then awards the construction contract. This sequence can provide a well-defined design before pricing, but it commonly places the design and construction handoff on the critical path.
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Construction manager at risk (CMR) is another method used in the CII and Charles Pankow Foundation comparison. The owner’s contractual structure and the construction manager’s authority can vary by jurisdiction and project, so an owner should examine the proposed form rather than assume that every CMR arrangement operates identically. Compared with design-build, CMR usually does not put design and construction under the same single contract.
Why design-build can shorten the schedule
Fewer contractual handoffs
When the designer and builder work for one design-builder, coordination does not have to pass through two separately contracted organizations before a question is resolved. The design-builder can make constructability, sequencing, and procurement decisions within one delivery organization, subject to the owner’s requirements and approvals.
Design feedback arrives earlier
Estimators, superintendents, trade partners, and suppliers can review developing design information while it is still being shaped. That feedback can identify access problems, fabrication constraints, equipment lead times, temporary works, and installation conflicts before they become field changes.
Some work can overlap
A design-builder may release an early site, foundation, utilities, or equipment package while later portions of the design are being completed. This is often called fast-tracking. It can reduce elapsed time when the packages are sufficiently defined and approvals, procurement, and permitting are aligned. It also creates exposure to rework if the design basis changes after construction starts.
Decisions have a clearer escalation path
A single prime contract can make responsibility for coordinating a design clarification, cost impact, and schedule effect more direct. That does not eliminate disputes, but it can reduce the number of interfaces an owner must manage compared with separate design and construction contracts.
What the 2018 comparative study found
The CII and Charles Pankow Foundation study covered 212 projects completed from 2008 through 2013. The sample included 53 design-bid-build projects, 79 construction manager at risk projects, and 80 design-build projects. DBIA’s summary reports the following comparative results:
| Measure | Design-build result versus CMR | Design-build result versus DBB | How to read it |
|---|---|---|---|
| Total delivery time, design through completion | 61% faster | 102% faster | Relative delivery-speed comparison for the study sample |
| Construction-phase duration | 13% faster | 36% faster | Field-construction interval only, not total delivery |
| Schedule growth | 3.9% less | 1.7% less | Difference in growth from the planned schedule |
| Average cost per square foot | 1.9% lower | 0.3% lower | Average comparison across the studied projects |
| Cost growth | 2.4% less | 3.8% less | Difference in growth from the planned or agreed cost basis |
These are historical group comparisons, not a guaranteed production rate for a future building. The projects spanned different building types, owners, locations, and circumstances. The study’s sample period also ended in 2013, so current labor markets, material lead times, codes, financing conditions, and digital coordination practices may differ.
The total-delivery figures and the construction-duration figures answer different questions. The larger advantage in the total interval is consistent with a delivery approach that changes the sequence of design, procurement, and construction—not proof that every design-build site crew works at the same percentage faster.
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Where the schedule advantage can disappear
Unclear owner requirements
Design-build shifts coordination responsibility, but it does not remove the need for a clear owner’s project requirements document. If room data, performance criteria, phasing, interfaces, or acceptance standards remain unresolved, design may pause or be revised after procurement has begun.
Slow owner decisions
Overlap only helps when the owner can make timely decisions. A late choice about equipment, finishes, operational technology, security, sustainability targets, or a change in room function can affect design packages already released for construction.
Permitting and third-party approvals
Authorities having jurisdiction, utility companies, environmental reviewers, lenders, and end-user stakeholders can control activities outside the design-builder’s contract. An integrated team cannot lawfully build work that lacks a required approval.
Long-lead procurement
Early release can protect the schedule when a critical piece of equipment has a long manufacturing period. It can also create cost and rework risk if the owner has not frozen the performance requirements or if substitutions become necessary.
Site and market conditions
Unknown utilities, contaminated soil, severe weather, labor shortages, material disruptions, and restricted working hours can overwhelm the benefit of an integrated contract. These factors must be modeled in the project schedule rather than treated as delivery-method problems alone.
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Contract and team capability
Design-build works best when the prime organization has genuine design-management and construction-management capability, reliable trade partners, disciplined change control, and a way to preserve design quality while meeting dates. A weak team can reproduce the same coordination failures under one contract.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Comparing design-build, DBB, and CMR for an owner
| Decision axis | Design-build | Design-bid-build | CMR |
|---|---|---|---|
| Schedule logic | Can overlap design, procurement, and construction packages | Usually more sequential because construction follows completed design and bidding | Can provide construction input during design; exact overlap depends on the contract and packaging |
| Design and construction relationship | One prime contract for both | Separate owner contracts | Separate designer and construction-management relationships are common |
| Owner control of design detail | Owner sets requirements and approval points; day-to-day integration is delegated | Owner retains a direct design contract and typically has more direct design administration | Owner retains substantial design involvement while receiving construction input |
| Primary interface risk | Owner must define requirements and monitor the integrated team | Owner manages the designer–builder handoff and coordination between contracts | Owner must coordinate the designer and construction manager’s responsibilities |
| Pricing context | Price may be established before every design detail is complete, depending on procurement strategy | Competitive bids are commonly based on more complete design documents | Pricing and guaranteed-maximum-price arrangements vary by contract and timing |
| Potential fit | Schedule-sensitive work where performance requirements can be defined and early trade input has value | Projects where a completed design, direct design control, or procurement rules favor a sequential process | Owners seeking early construction expertise while retaining a separate designer |
The CII/Pankow comparison supplies performance evidence for the three methods, but it does not decide procurement legality or suitability for a particular owner. Public agencies, regulated institutions, and grant-funded projects may face statutory rules that limit the available methods.
A practical way to decide whether design-build fits
- Set a measurable baseline. Identify the required occupancy date, interim milestones, design start, procurement dates, construction start, commissioning, and handover. Separate dates the owner controls from dates controlled by authorities or suppliers.
- Define the owner’s project requirements. Record capacity, performance, durability, code, accessibility, energy, technology, security, operational, and aesthetic requirements. Mark which items are fixed and which may be developed with the design-builder.
- Check procurement authority. Confirm that the governing law, funding source, contract rules, and internal approvals permit design-build and the intended selection process.
- Test the market. Ask prospective teams whether they have the designers, trade capacity, estimating depth, and procurement relationships needed for the project’s location and technical complexity.
- Map packages that could overlap safely. Identify long-lead equipment and early works, then define the information, approvals, and design maturity required before each release.
- Set decision deadlines. Establish who may approve submittals, substitutions, design changes, and contingency use, and how quickly each decision must be made.
- Allocate risks deliberately. Assign responsibility for design errors, differing site conditions, permitting, escalation, owner changes, utilities, and third-party interfaces to the party best able to control each risk. Price uncertainty rather than hiding it in a promise of speed.
- Track both time and growth. Monitor design completion, procurement status, installed quantities, schedule variance, change exposure, cost growth, and unresolved decisions. A shorter planned duration is not a success if rework later erases it.
How to protect the benefit during delivery
- Use a single, current responsibility matrix for owner, designer, design-builder, consultants, and authorities.
- Maintain a decision log showing the responsible approver, due date, effect of delay, and final direction.
- Release construction packages only after documenting design assumptions, interfaces, and hold points.
- Use design reviews that include the people who will fabricate, install, commission, and operate the systems.
- Keep a change-control process that distinguishes owner changes from design development, unforeseen conditions, and contractor means and methods.
- Reforecast the completion date whenever a permit, long-lead item, or owner decision moves the critical path.
What the market forecast does—and does not—show
DBIA reported that an FMI Corporation study published in 2024 projects design-build to account for more than 47% of U.S. construction spending by 2028. That figure is a forecast, not a measured 2028 outcome and not evidence that every owner should select design-build. It does indicate that owners and delivery teams are using the method broadly enough for its contract structure and management practices to remain important across multiple U.S. sectors.
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Design-build can accelerate completion when integration changes the critical path: design decisions arrive earlier, packages overlap responsibly, and one team coordinates design, procurement, and construction. The 2018 CII and Charles Pankow Foundation comparison provides meaningful evidence of faster total delivery, shorter construction periods, and lower growth measures in its sample. Treat those findings as a benchmark for evaluating a delivery strategy, not as a guaranteed schedule reduction. The owner still has to define the work, choose a lawful procurement route, make decisions on time, and select a team capable of executing the overlap without rework.
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