Design-build vs general contractor, side by side
| Design-build | Designer, then general contractor | |
|---|---|---|
| Contracts you sign | One | Two (designer, then builder) |
| Who owns the drawings | Check the contract; often the firm until paid | You, once the designer is paid |
| Competitive bids on the same plans | Not usually: the firm that drew it prices it | Yes, as many as you like |
| Who answers for a design error that causes a build problem | The one firm | Designer and builder may point at each other |
| Time before construction starts | Shorter: no bid round | Longer: plans, then bids |
| Fits | A remodel where you trust one firm and value one point of contact | An addition or new house where price competition matters |
Neither route changes the permit. The contractor of record pulls it, the city inspects the work, and the job ends with a final inspection either way.
Who may draw residential plans
Many design-build firms keep an in-house designer rather than an architect. Whether that is enough depends on your state and the job. California's rules, as the City of Downey's building division sets them out (citing B&P 5537, 5538 and 6737.1):
| Unlicensed designers may prepare plans for | A licensed architect or engineer must prepare |
|---|---|
| "Single-family dwellings of wood frame construction not more than 2 stories and basement in height" | "Projects with interior or exterior structural alterations" |
| Garages and accessory structures for a single-family home | "Cripple walls exceeding 4' in height or adjacent to garage door openings" |
| "Multiple dwellings containing not more than four dwelling units of wood frame construction" | Any project the building official deems to need professional design |
| Non-structural alterations and additions, cabinetwork, fixtures |
The line that matters for a remodel: an unlicensed designer "may not prepare plans for those alterations that will change or affect any components of the structural system". Removing a bearing wall or adding a second storey brings in an engineer or architect whichever route you choose. Ask the design-build firm who stamps the structural sheets and whether that cost is in the price.
On the builder side, a design-build firm doing several trades in California needs at least a B general building licence, which covers contracts for "two or more separate and unrelated trades" (CSLB Fast Facts). Our subcontractor guide covers what it must hand to licensed trades.
How long the build takes, whichever route
Design-build saves time before the permit, not after it. Once the permit is issued, the inspections run the same:
| City | Job | Permits | Usual days, permit to final | Reached a final |
|---|---|---|---|---|
| San Diego, CA | Addition | 671 | 343 | 82.7% |
| Columbus, OH | Addition | 329 | 258 | 86.0% |
| Cary, NC | Addition | 303 | 196 | 85.2% |
| Minneapolis, MN | Remodel | 5,552 | 161 | 75.5% |
| Cary, NC | Remodel | 1,857 | 84 | 88.9% |
In Cary, the city in the table with both rows, the usual addition took 196 days against 84 for a remodel; in San Diego a remodel took 162 against 343 for an addition. If a design-build firm promises an addition in a fraction of these times, ask what it is counting from.
Getting a fair price on design-build
You give up the bid round, so put the price structure in writing instead. Vermont's statute is a good checklist even outside Vermont: a residential contract must say whether it is a total price, time and materials up to a maximum, or time and materials with no maximum, and must describe the work, the materials and how changes are approved (26 V.S.A. § 5509(b)). Many design-build firms sign a design agreement first and price the build when the drawings are done; ask whether you can take the drawings to another builder if you do not accept that price. Our fixed price vs cost-plus guide covers the price types and how to compare contractor bids covers the bids.
Check it in five minutes
- Ask each firm, design-build or not, for the addresses of two permitted jobs like yours.
- Look the firm up on your city's compare page, for example San Diego addition builders, and check how many of its permits reached a final.
- Check the licence number on the state board; our verification guide links every state's lookup.
- Ask who stamps the structural drawings, and get it in the contract.
Compare San Diego addition builders by finished permits →
What this does not tell you
Permits do not record whether a firm worked design-build or from someone else's plans, so we cannot compare the two routes' costs or finish rates. The plan-preparation rules quoted are California's, as one city summarises them; other states draw the line elsewhere. Days to final measure from permit issue, not from the first design meeting.
How we know this
Permit counts, filed values, days to final and finished shares come from the City of San Diego, City of Columbus, Town of Cary and City of Minneapolis permit files, three-year windows ending September 2026. "Usual days" is the median from issue to final inspection; "reached a final" is the share of permits a year or more old with a recorded final. The plan-preparation rules are quoted from the City of Downey's page (read 22 October 2026), the B-licence rule from CSLB's Fast Facts (updated April 2025) and the contract terms from 26 V.S.A. § 5509.
Numbers come from City of San Diego Development Services approvals; City of Columbus Building & Zoning Services permits on 1-, 2- and 3-family homes (the city's Accela permit layer); Town of Cary building permit applications (issued permits only); City of Minneapolis construction permits (CCS), data through October 17, 2026. Nobody paid to be on this page and nobody can.
Questions
- Is design-build cheaper than hiring a general contractor?
We found no official or independent figure that says so either way, so we give none. The structural difference is bidding: with your own plans you can get several fixed-price bids on the same drawings, which the California licence board recommends; with design-build the price is set by the firm that drew the plans. In San Diego the middle half of addition firms usually file between $61,775 and $142,054, so a competitive bid can matter.
- What is design-build?
One firm designs the project and builds it under one contract. The alternative, often called design-bid-build, is to hire a designer or architect for the plans and then a general contractor, chosen by bid, to build them.
- Does a design-build firm need an architect?
Not always for a house. In California, unlicensed people may prepare plans for single-family wood-frame dwellings of no more than two stories and a basement, and non-structural alterations, but not alterations that change the structural system; those need a licensed architect or engineer (City of Downey, citing B&P 5537). Ask who will stamp the structural sheets.
- Which is faster, design-build or a general contractor?
Design-build can start construction sooner because there is no separate bid round, but the permit and inspections take the same time either way. A usual addition permit went from issue to final in 343 days in San Diego and 196 in Cary, North Carolina.
- Who pulls the permit on a design-build job?
The design-build firm, as the licensed contractor. The permit names the contractor, not the designer, so the firm's permit history on our compare pages is its building record.
Build your own list
Every firm with that kind of permit on record. Pick what you value. The list moves.
Related guides
- Fixed price vs cost-plus contracts: which to sign, and what state law says about each
- Remodel vs rebuild: what remodel, demolition and new-home permits cost in 10 cities
- How much does it cost to hire a general contractor? Filed job values in 12 cities, and what the fee covers
- How long does a home project take? Permit to final inspection, by job and city
- Home addition cost in 2026: what addition permits were filed at in 14 cities
For one city
- Who is authorized to prepare plans — City of Downey Building & Safety Division (citing B&P Code 5537, 5538, 6737.1) (accessed 2026-10-22)
- How do I find the right licensed contractor? — CSLB (accessed 2026-10-21)
- Fast Facts: What Jobs "B" General Building Can/Cannot Perform — CSLB (updated 04/25) (accessed 2026-10-22)
- 26 V.S.A. § 5509, Contract requirements (Vermont residential contractors) (accessed 2026-10-22)