Designer, Design-Build Firm or General Contractor? Choosing How to Run a Bay Area Remodel

Short answer: there are three common ways to run a remodel. In a designer-led project, a design professional prepares the design and you hire a contractor separately. 'Designer' and 'architect' are not interchangeable: under BPC § 5536, only licensed architects may use the title 'architect' or a confusingly similar term, while designers and drafters may prepare plans only within the limits the law allows. A design-build firm, a licensed contractor that also designs, gives you one company responsible for both. In a contractor-led project, you bring your own ideas or simple drawings to a general contractor. Each can work. The deciding factors are how complex the design is, whether structural or layout changes need professional drawings, how much separate checking you want, and who will be accountable when what is built does not match what was drawn. This guide covers professional remodels done by licensed contractors. Owner-builder projects and legitimately minor work have their own rules (see owner-builder risks and the minor work exemption). Under BPC § 7057, a general building (B) contractor may take a prime contract that involves at least two unrelated building trades or crafts other than framing or carpentry. For a contract involving a single other trade, the B contractor must hold the appropriate specialty license or subcontract the work to a properly licensed specialty contractor. Specialty (C) contractors usually perform a single trade (CSLB, what kind of contractor do you need).

This is general information current to 3 October 2026, not legal advice.

Where things go wrong

An owner described a kitchen where the finished work did not follow the design rendering. They had paid a $30,000 deposit to the design firm for countertops, cabinets and demolition, demolition started four days after signing, and they felt unable to walk away because of the money held. Another owner, planning a $300,000 remodel, would deal with the contractor through an interior designer and worried about how to judge change order prices with 'a layer' in between. A third, who finished a kitchen on budget, wrote that quotes varied widely and that they cut items every contractor wanted to add, such as pendant lights. These are anecdotal accounts. They point to the same questions: who controls the design, who answers for differences between drawing and result, and who holds your money.

The three models compared

Whatever the model, any portion that needs an architect's or engineer's work, such as structural changes, must be prepared by an appropriately licensed professional. A design-build firm should engage qualified licensed design professionals when needed rather than having unlicensed staff produce those portions.

Plans, permits and who may prepare drawings

Many remodels need drawings for a permit. California's Architects Practice Act, in BPC § 5537, allows plans for single-family dwellings of woodframe construction of not more than two stories and basement to be prepared by people who are not licensed architects. But if any portion departs from conventional framing requirements, the building official must require that portion to be prepared by, or under the responsible control of, a licensed architect or registered engineer. In practice, removing a load-bearing wall or adding a beam usually brings in an engineer. Local handouts show how this works. Pleasanton's kitchen alteration requirements, for instance, ask for the plan preparer's name and any license number on each sheet, and for structural calculations by a qualified design professional when load-bearing walls are removed or altered. Other departments have their own checklists.

What each arrangement must get right

Designer-led

• Define the designer's scope: concept, construction drawings, selections, permit submission, bidding help, site visits, punch-list review.
• Make the drawings bid-ready: dimensions, fixture and finish schedules, and details for the tricky areas, such as the shower, island and cabinet layout.
• Agree who resolves conflicts when the contractor finds something the drawings missed.
• Separate the money. Pay the designer for design services. Construction payments go to the licensed contractor under a compliant home improvement contract with the legal down payment limit. Be cautious about large deposits paid to a design firm for construction work or materials. Ask exactly which entity is the contractor and check its license on the CSLB lookup.

Design-build

• Check the license of the entity that signs the construction contract.
• Consider a two-phase arrangement, a practical option rather than a requirement: a design agreement with a defined fee and deliverables, then a construction contract once drawings and selections are complete. Whether you may reuse the drawings with another contractor depends on the design agreement, which should say so explicitly. Drawings are often subject to the designer's ownership or licensing terms.
• Ask for the drawings and specifications to be attached to the construction contract, so 'built as designed' has a reference.
• Make the construction contract comply with California's home improvement rules: required content, notices, a down payment within the limit (unless the firm qualifies for the blanket bond exception), and payments tied to work. See our contract checklist.

Contractor-led

• Bring photos, product links and a written scope.
• Ask the contractor who will produce any drawings the permit needs, and whether an engineer is required.
• Compare bids on an identical scope. See comparing bids.

When the result doesn't match the rendering

1. Find the controlling document. Renderings are often illustrative. Construction drawings, specifications and selection sheets attached to the contract control. If only a rendering exists, the dispute is harder.
2. List the differences with photos side by side with the drawing.
3. Ask who caused each one: a design change you approved, a site condition, or a contractor deviation.
4. Request correction in writing, with a date. See our guide on design not matching the rendering.
5. Keep paying only for conforming work, within the limits on withholding disputed amounts. See withholding final payment.

A worked decision

Hypothetical. An owner wants to open a wall between the kitchen and dining room, relocate the sink to an island, and add a pantry. The wall may be load-bearing, and the island needs a vent solution for the sink drain. That is a design-sensitive, structural project. A designer-led route makes sense if the owner wants competing construction bids on identical drawings and independent advice on layout. A design-build route makes sense if the owner values one accountable firm, accepts less bidding competition, and confirms the firm will bring in a licensed engineer for the beam. In either case, an engineer will probably be involved for the beam, and the drawings and engineering should be attached to the construction contract. A contractor-led route with only photos and a verbal scope is the riskiest choice for this project, because 'what was agreed' has no reference document.

By contrast, an owner replacing cabinets, countertops and appliances in the same layout may be well served by a contractor-led approach with clear selections, because there is little to design and a lot to specify.

Decision checklist

• Are there structural, layout or plumbing relocation changes? Professional drawings and engineering are likely needed.
• Do you want competitive construction bids on identical drawings? Designer-led.
• Do you want one accountable firm? Design-build, possibly with a two-phase agreement that states your rights to the drawings.
• Is the job like-for-like with clear selections? Contractor-led may be enough.
• Is construction money paid only to a licensed contractor, within the legal down payment limit?
• Are drawings and selection sheets attached to the construction contract?
• Is it clear who approves changes and who answers for design errors?

Bay Area applicability

The licensing and payment rules are statewide. Plan-preparation and submittal requirements are applied by each building department, under the 2025 California codes effective 1 January 2026, using its own checklists. Ask your department, or check its website, for a residential remodel submittal checklist before deciding how much design help you need.

Current to 3 October 2026.