Design-build vs. hiring a designer and a general contractor

Design-build means one firm handles design and construction under one contract. Design-bid-build means you hire an architect or designer to produce plans, then bid those plans to general contractors and sign a separate construction contract. Both are legitimate ways to remodel a house in Sacramento, and both are covered by the same California consumer-protection rules.

CDI Construction is a design-build firm. The rest of this page describes both models as they work in practice, including the cases where design-bid-build is the better choice.

How each model works

Design-bid-build runs in three stages:

1. You hire an architect or designer under a design contract.
2. They produce drawings and specifications that are complete enough to bid and to submit for a permit.
3. You give the same plans to several general contractors, compare bids, and sign a construction contract with one of them.

You hold two contracts: one with the designer, one with the builder. The designer works for you, not for the contractor.

Design-build runs as one engagement. A design-build firm develops the design, prices it, obtains the permits, and builds it, under a single contract with you. The designer and the builder are on the same side of the table.

The steps of an actual remodel (consultation, design, pricing, permits, construction, walkthrough) are similar under both models. Our Sacramento renovation process guide walks through them in order, and our process page shows how CDI runs them.

Where design-bid-build is the better choice

You want competitive bids on a fixed design. Because every contractor prices the same drawings, the bids are directly comparable. This is the main strength of the model. Bids are only comparable when every bidder prices an identical scope, and a finished set of plans is the most precise scope you can hand out.

You want an independent advocate. An architect you hire directly represents your interests, not the builder’s. The California Architects Board lists the services an architect may provide, including help preparing bid documents and the agreement between owner and contractor, contract administration, and construction observation. If you want someone checking the contractor’s work on your behalf, ask the architect whether those services are in their scope; the Board recommends asking how often they will be on site and what their role is during visits.

The project is complex, historic, or structural. Large additions, significant structural changes, hillside or unusual sites, and older homes with preservation constraints benefit from a design professional who is engaged before any builder. Some of these projects legally require a licensed architect or engineer anyway (see below), and some owners prefer that professional to answer only to them.

You already have plans. If you have a finished set of drawings from an earlier design effort, bidding them is the obvious next step.

Where design-build helps

One party is responsible for design and construction. When the drawings miss a condition found during construction, there is no dispute between two companies about whose problem it is. The same firm owns both.

Budget feedback during design. In design-bid-build, the first real construction price often arrives after the design is finished. If the bids come in over budget, you pay to redesign and rebid. In design-build, the people pricing the work see the design as it develops, so cost problems surface while they are still cheap to change.

Fewer handoffs. One contract, one set of communications, and one firm coordinating design decisions with construction sequencing. For many single-family remodels, this is the simpler path.

The risks of each

	Design-bid-build	Design-build
Main risk	Bids come in above budget after design is paid for	No competing bids on an identical design
Accountability	Split between designer and contractor	Held by one firm
Who advocates for you	Your architect or designer, if their scope includes it	You, unless you hire an independent reviewer
Typical friction point	Gaps between the drawings and site conditions	Pricing transparency and change-order terms
Best fit	Complex, historic, or structural work; owners who want bids	Owners who want cost feedback during design and one contract

Two points cut against design-build specifically. First, because the same firm designs and prices the work, you lose the check that competing bids provide. You can offset this by asking for an itemized proposal and by reading the questions to ask any contractor before signing. Second, nobody on the firm’s payroll is your independent advocate. Owners who want one can hire an architect or consultant to review the design or observe construction.

Two points cut against design-bid-build. A complete set of plans does not guarantee the bids will fit your budget, and a redesign costs time. And when the contractor finds something the drawings did not anticipate, you are the one coordinating between the designer and the builder.

Who can legally draw your plans

California does not require a licensed architect for every home project. Business and Professions Code § 5537 allows people who are not licensed architects to prepare plans for:

• Single-family dwellings of wood-frame construction not more than two stories and a basement in height.
• Multiple dwellings of no more than four units, under the same wood-frame and height limits.
• Garages and other structures appurtenant to those buildings, under the same limits.

The limit is in § 5537(b). If any portion of the structure departs from substantial compliance with conventional wood-frame requirements in the building code, the building official must require plans or calculations for that portion from a licensed architect or registered engineer, bearing that licensee’s stamp and signature. The California Architects Board’s consumer guide adds that unlicensed persons may not design any component that changes or affects the safety of a building, including structural or seismic components.

In practice: a kitchen or bathroom remodel in a one- or two-story wood-frame house can usually be drawn by a designer. Removing a bearing wall, adding a second story, or other structural work will usually need an engineer’s stamp on at least that portion. The Board recommends asking your local building department whether your project requires a licensed architect or engineer before you hire anyone to design it. This applies under both models; a design-build firm that is not itself an architecture firm will bring in an engineer when the structure calls for one.

California rules that apply either way

The construction contract you sign is a home improvement contract under Business and Professions Code § 7159, whether it comes from a design-build firm or from the general contractor who won your bid.

What the contract must contain. Among other items, § 7159 requires the contractor’s name, business address, and license number; the contract price; a description of the work and significant materials; the approximate start and completion dates; a schedule of progress payments; and required notices, including a mechanics lien warning and notices on workers’ compensation and commercial general liability insurance. You are entitled to a fully completed, signed copy. Change orders must be in writing and signed before the extra work starts. The CSLB adds that payments to the contractor cannot exceed the value of the work performed.

The down payment limit. The down payment may not exceed $1,000 or 10% of the contract price, whichever is less. The CSLB notes a narrow exception for contractors with a blanket performance and payment bond on file.

The right to cancel. For most home improvement contracts, the buyer has three business days to cancel by written notice, or five business days if the buyer is 65 or older. The contract must include the cancellation notice and a form you can use to cancel. Certain contracts are exempt, including qualifying service and repair contracts.

Check the license. The CSLB’s Check a License tool searches by license number, business name, or personnel name. Look up every contractor you consider, under either model.

Permits. The CSLB recommends that the contract state who pulls the building permits and whether permit fees are included in the price. The CSLB treats a contractor’s failure to obtain a required building permit as a violation of Contractors License Law (Business and Professions Code §§ 7110 and 7090), and warns that unpermitted construction can expose the homeowner to additional liability and costs.

Your design contract carries its own rules. If you hire an architect, California law (Business and Professions Code § 5536.22, summarized in the Architects Board guide) requires a written contract for architectural services with specified minimum contents.

How to decide

Choose design-bid-build if competitive bids on a fixed design matter most to you, if you want a design professional who answers only to you, or if the project is structurally complex or historic. Choose design-build if you want cost feedback while the design is still changing and one firm responsible for both the drawings and the work.

Under either model, verify every license, read the contract against § 7159, and keep the down payment within the legal limit. For a whole-house project, our whole-home remodels page describes how CDI approaches that scope.