Short answer. Design-build is one contract for design and construction. Traditional design-bid-build separates them. Design-build typically lands 5 to 15 percent cheaper, runs 4 to 8 weeks faster, and produces fewer change orders. Traditional works better when the homeowner already has a trusted architect or wants competitive bidding after design is fixed.
The two delivery methods
Design-build
One firm signs one contract that covers design and construction. The designer and the builder work for the same company and share accountability for budget and schedule. Most California residential design-build firms include the architect, designer, and project manager under one roof.
Design-bid-build (traditional)
The homeowner hires an architect or designer first. Drawings are completed, then sent to multiple contractors for bid. The winning contractor signs a construction-only contract. The architect monitors construction on behalf of the homeowner.
Direct comparison
| Factor | Design-build | Design-bid-build |
|---|---|---|
| Total cost | 5 to 15 percent lower | Baseline |
| Total schedule | 4 to 8 weeks faster | Baseline |
| Change orders | Fewer (cost input during design) | More (design fixed before bid) |
| Accountability | Single firm | Split between architect and builder |
| Cost certainty | Earlier in process | Only after bid received |
| Bid competition | None (single firm) | Multiple bids |
| Best for | Cost-sensitive, schedule-driven | Design-driven, custom architecture |
When design-build wins in Los Angeles
- ADUs and garage conversions. Budget is tight, schedule matters, and design choices have direct cost impact.
- Kitchen and bathroom remodels. Trade coordination and material selections drive cost. A unified team prevents drawings that cannot be built to budget.
- Full home remodels under $400,000. Cost discipline outweighs design optionality.
- First-time remodelers. Single accountability simplifies decisions.
When traditional design-bid-build wins
- High-end custom architecture. The architect's vision drives the project, and design fees are not the constraint.
- Hillside or specialty structural projects. The architect leads structural strategy and selects contractors qualified for execution.
- Public or institutional work. Often required by procurement rules. Not relevant to residential remodel.
What to ask a design-build firm
- Is the designer an employee or a partner?
- How early in design do you provide cost feedback?
- What happens if the design we love is over budget?
- How are design fees and construction fees structured? Separate phases or one fee?
- Who owns the drawings after construction?
See how to choose a general contractor for the broader selection framework. For project timelines, read kitchen remodel timeline. For mistakes to avoid, read 11 kitchen remodel mistakes. To start a design-build conversation, open the contact page.
