Design-Build vs Design-Bid-Build: Which One Fits a Commercial Build-Out?
The difference between design-build and design-bid-build is the number of contracts. In design-build you sign one contract with one company for both the design and the construction. In design-bid-build you hire an architect to finish the drawings, then contractors bid on them, and you sign a second contract with the builder, usually the low bid. Design-build is usually faster and gives you one party to hold responsible. Design-bid-build gives you the most price competition and takes the longest.
| Design-build | Design-bid-build | |
|---|---|---|
| Contracts you sign | One, with the design-builder | Two: architect, then builder |
| When the builder joins | Day one, before the layout | After the drawings are finished |
| How the builder is picked | Experience, fit and a price that develops with the design | Competitive bids; lowest total price usually wins |
| Who you call when drawings and site disagree | The design-builder | The architect and the builder, separately |
| Schedule | Phases overlap: pricing, ordering and permitting start early | Design, then bid, then build, in order |
| Best for | Tenant improvements, conversions, tight open dates | Owners who already have an architect and time to bid |
There is a third common option, construction manager at risk (CMAR), covered below. We have run commercial jobs all three ways.
Not sure which route fits your space? We build commercial interiors and site work across Portland and Southwest Washington, licensed in Oregon (CCB #198582) and Washington (MODERNI888R7). Ask for a walkthrough or call (360) 326-2747, and we will tell you which method fits, even if it is not ours.
How design-bid-build works
Design-bid-build is the traditional sequence: design, then bid, then build. You hire an architect or engineering firm to design the project. When the drawings are complete enough to bid, the job goes out and contractors submit prices on the same set of plans. The builder generally does not help develop the design. The Associated General Contractors of America puts it plainly: design and construction are separate contracts, and the only criterion for the final selection is the lowest total construction cost.
That is the method's strength and its weakness. You get real price competition on one defined scope. But the price is only as complete as the drawings. Anything the drawings miss, like an existing duct in the way or a slab that is not where the plans say, shows up after you have signed, as a change order. And because each phase waits for the last one, it is the slowest of the three routes.
How design-build works
In design-build, one company holds one contract for the design and the construction. The Design-Build Institute of America calls that single contract the fundamental difference from every other delivery method. Your builder is at the table before the layout is drawn, so the people pricing the work and building it are the same people shaping it.
In practice, that changes three things on a commercial job:
- Price while it is still a drawing. You find out a glass wall or a new restroom does not fit the budget while it is a line on paper, not after the plans are permitted.
- Start sooner. Long-lead items like storefront, rooftop HVAC units and electrical gear can be ordered before every drawing is final.
- One party to call. When the field does not match the drawings, the design-builder fixes it. You are not refereeing an architect and a contractor who each point at the other.
The trade-off is real: you are not bidding finished drawings against several builders, so you are trusting your design-builder on price. A good one shows you the numbers as the design develops. DBIA says decades of research link design-build to faster delivery and less cost and schedule growth; that is the industry group's own summary, so judge it against how the contractor in front of you actually prices.
The third option: construction manager at risk
Construction manager at risk (CMAR) sits in between. You keep your own architect, but the contractor joins early to price and plan, then commits to a guaranteed maximum price before construction. It fits owners who want their own designer and still want the builder in the room early. We used it for the landlord work at Mercantile Village in Lake Oswego, which got the shell ready before we built the Thirsty Caterpillar bookstore and cafe there.
The Oregon detail most comparisons skip: who has to draw it
Owners often assume design-build means no architect. In Oregon, whether a licensed architect has to prepare the drawings depends on the work, not the delivery method. Under ORS 671.030, a non-architect may prepare the drawings for an alteration when the structure is not involved (foundation, floors, roof, bearing walls, beams, columns and joists) and the building code occupancy and construction type do not change. A new building with a ground area over 4,000 square feet, or taller than 20 feet, falls outside that exemption.
What that means for you:
- A straightforward tenant improvement, new walls, ceilings, lighting and finishes inside an existing suite with the same use, can often be drawn by the design-build team itself.
- A change of use or structural work, like a store becoming a clinic, or new openings in a bearing wall, brings in a licensed architect or engineer, in design-build or any other method. Our guide to converting retail space into a dental or medical clinic covers that occupancy change.
- The building department has the final say at plan review, whether that is Portland, a Washington County city, or Vancouver in Washington. See who pulls the permit.
Which one fits your project?
A simple way to decide, from the jobs we see:
- Choose design-build when the open date is fixed, the space is changing what it is, or you want one company responsible from layout to keys. Most of our recent commercial design-build jobs are 1,900 to 5,800 square feet, the size where speed and one price matter more than a long bid process.
- Choose design-bid-build when you already have an architect, the drawings are done or close, and you have time to bid them.
- Choose CMAR when you want your own architect but also want the builder pricing and planning before the design is locked.
What design-build looked like on our recent jobs
These are real Modern Northwest projects, run design-build according to our project records:
- Ace Hardware garden center, Washougal WA. A 5,800 square foot garden center outside the store, built August to October 2025: saw cutting, demolition, excavation and paving, concrete, steel fences and gates, footings for a future canopy, striping and signage. Design-build is not only for interiors. See the Ace Hardware project.
- Elevate Towers, Hillsboro. Updated lobbies in Tower I and Tower II plus a ground-floor spec suite, in two working office towers.
- Uptown Family Dental, Beaverton. A former blood bank turned into a dental office, the kind of conversion where the existing plumbing and power drive the design.
- Axletree, Milwaukie. A 1,900 square foot first-tenant space for a florist and a 1,900 square foot spec suite next to it.
Our development side is led by Sergey Marandyuk, VP of Development, who holds Bachelor of Science and Master of Architecture degrees from Portland State University, so layouts get drawn with how they will be framed, plumbed and inspected in mind.
Frequently asked questions
What is the main difference between design-build and design-bid-build?
The number of contracts. In design-build, one company holds a single contract for both the design and the construction. In design-bid-build, the owner signs one contract with an architect and a separate one with the builder, who is picked after the drawings are done.
Is design-bid-build cheaper?
It gives you the most price competition on the construction contract, because builders bid the same finished drawings and the low bid usually wins. It is not automatically cheaper overall: anything missing from the drawings turns into a change order after the contract is signed.
Who owns the design in design-build?
The design-builder is responsible for it, under the same contract as the construction. You still approve the layout and the finishes. A licensed architect or engineer still stamps the drawings whenever Oregon law or the building department requires one.
Do I need an architect for a tenant improvement in Oregon?
Not always. Under ORS 671.030, a non-architect may prepare drawings for an alteration that does not involve the structure and does not change the building code occupancy or construction type. Structural work, a change of occupancy, or a new building above the size limits needs a licensed design professional. The building department decides at plan review.
Can I switch delivery methods partway through?
Yes, but it costs time. If you already have finished drawings from your own architect, the cleanest path is usually to bid them or bring a contractor in to price them, rather than starting a new design-build contract.
Which method is fastest?
Design-build is usually the fastest route, because pricing, ordering and permitting can start before every drawing is final. Design-bid-build is the slowest, because each phase waits for the one before it to finish.
The bottom line
Design-bid-build buys price competition with time and a gap between the people who design and the people who build. Design-build buys speed and one point of responsibility, and asks you to trust the builder on price. For most commercial tenant improvements and conversions with a set open date, design-build is the better fit. If you already have finished drawings, bid them.
Modern Northwest has built commercial projects across Portland and Southwest Washington since 2005, and we work as a design-build contractor in Portland when the job fits. Tell us about your space and your open date, and we will walk it with you.
Want one team from layout to keys?
Tell us about the space or the site and your open date. We will set up a walkthrough.
Request a Free Consultation