Questions to Ask a Custom Home Builder in the Bay Area

Why Custom Home Interviews Are Different From Remodel Interviews

A $500,000 kitchen remodel takes four to six months. A $2 million ground-up custom home in Los Altos or Saratoga takes 14 to 24 months from the first sketch to certificate of occupancy, and that assumes standard permitting. You are not hiring a contractor for a season. You are hiring a business partner for the better part of two or three years, with a construction lender, an architect, a structural engineer, a geotechnical engineer, and a city planning department all moving through the same calendar.

That is why the builder interview for a ground-up custom home has to go deeper than a remodel interview. Licensing and references matter. They always matter. But they are the floor, not the ceiling. The questions that separate a qualified custom home builder from one who is about to learn on your project concern how they structure design phases, how they coordinate draw packages with your lender, and how they manage the handoff from the architect of record to the construction team.

This guide organizes the interview around the project lifecycle: qualification, design, engineering and permits, contract and budget methodology, construction loan coordination, on-site execution, and warranty. Use it as a script for your shortlist calls. For complementary reading, see our guides on how to verify a CSLB license and how to read a contractor estimate.

1. Licensing, Bond, and Insurance Questions

Start here. The floor.

Q: What is your CSLB license number and classification?

The answer should be a Class B General Building Contractor license that you can verify in seconds at cslb.ca.gov. Class B covers new construction and remodels involving two or more unrelated trades. The newer Class B-2 Residential Remodeling Contractor classification (effective January 1, 2021) is limited to improvements to existing residential wood-frame structures, which means it is disqualifying for ground-up custom work. Class A is for fixed-works engineering projects (highways, tunnels, utilities) and is rarely relevant to single-family construction.

Q: What is your bond amount and who is your surety?

The CSLB contractor bond minimum is $25,000 under Business and Professions Code §7071.6 (raised from $15,000 on January 1, 2023 under SB 607). Confirm the bond is active and in good standing.

Q: What is your workers’ compensation status?

As of January 1, 2026, SB 216 Phase 2 is in force: all licensed contractors must carry workers’ comp, with a narrow joint-venture exception. “Exempt” on a CSLB lookup is a significant red flag in 2026 unless the builder can explain the specific entity structure justifying the exemption.

Q: What is your general liability limit?

A custom home builder should carry at least $2 million in general liability, ideally higher on homes above $3 million in construction value.

For reference, Custom Home Design and Build is licensed since 2005 (CSLB #986048) and carries $2 million general liability and $3 million workers’ comp.

2. Ground-Up Experience and Local Permit Knowledge

Q: How many ground-up custom homes have you delivered in the last five years, and where?

You want specific addresses or at least specific cities. A builder who has delivered 10 remodels and one new build is not the same as a builder who has delivered 10 ground-up homes. Ground-up work involves soil, foundation, structural envelope, and MEP rough-in decisions that a remodel-focused builder will not have internalized.

Q: Have you built in my city before, and who did you work with at the Planning Department?

Design review and HOA processes vary dramatically across the Bay Area. A builder who has navigated Woodside’s hillside grading review, Atherton’s Heritage Tree Ordinance, or Los Gatos’s design review is worth more on those projects than a builder with a bigger portfolio in flatter jurisdictions. Ask for the planning staffer they worked with most recently. Vague answers are a signal.

Q: What is your typical permit timeline in my jurisdiction?

A qualified answer includes a range, not a number. Permit timelines vary based on permit processing, inspection scheduling, trade availability, weather, and material lead times. San Jose typically processes residential permits in four to eight weeks; design-review cities like Palo Alto or Los Gatos can run 10 to 16 weeks or longer.

3. Design Collaboration and Architect Relationship

This is where most custom homes live or die.

Q: Do you deliver design-build, or do you work with an outside architect of record?

Both models work. What matters is that the builder can describe, in detail, how they collaborate with the architect across design phases and who carries design liability. Ask for references on projects where they collaborated with an outside architect through construction administration.

Q: Walk me through your AIA Schematic Design, Design Development, and Construction Documents deliverables.

AIA B101-2017, the standard owner-architect agreement, defines five basic services phases: Schematic Design (SD), Design Development (DD), Construction Documents (CD), Procurement (Bidding), and Construction (Contract Administration). A qualified builder or design-build firm can explain what the homeowner sees at each milestone: floor plans and elevations at SD, fully specified materials and systems at DD, and a permit-ready drawing set at CD. If the answer is vague on any phase, the builder is going to improvise during yours.

Q: How many design iterations do you include before construction starts, and what triggers additional fees?

Design fee structures vary. The industry convention (not AIA-mandated) allocates roughly one-third of architect fees to SD plus DD, about 40% to CD, and the balance to Bidding and Construction Administration. Ask where iteration caps sit and what drives the meter.

4. Engineering and Permit Risk

Q: Who is your structural engineer of record, and do you bring a geotechnical firm early?

California Building Code §106A.3.4.1 allows the building official to require an Architect or Engineer of Record when documents must be prepared by a licensed design professional. The Engineer of Record is responsible for reviewing and coordinating all submittal documents, including deferred submittals, for compatibility with the design. On custom homes with hillside conditions, large openings, or non-standard framing, this is not optional.

California does exempt residential wood-framed single-family homes up to two stories from the licensed-professional requirement UNLESS the project deviates from standard construction. Most Bay Area custom homes deviate.

Q: When does the soil report get commissioned?

Before schematic design locks in. A builder who orders the geotechnical report after foundation design has already compressed the schedule is going to spend the next 60 days re-engineering what could have been right the first time.

Q: How do you handle Title 24 2025 compliance and the BAAQMD zero-NOx timeline?

Title 24 Part 6 (2025 Energy Code) applies to permits filed on or after January 1, 2026, and makes heat pumps baseline for space heating and water heating in new single-family residential. BAAQMD zero-NOx appliance compliance dates phase in between 2027 and 2031. A qualified builder has a current compliance strategy, not a blank stare.

5. Contract, Pricing, and Construction Loan Questions

Q: Do you use AIA A101, A102, or A103, and why?

These are the three owner-contractor contract forms:

• AIA A101-2017: Stipulated sum (lump sum). Owner pays the contract price; contractor keeps any savings and absorbs any overage.
• AIA A102-2017: Cost of the work plus a fee with a Guaranteed Maximum Price (GMP). Caps owner’s total liability while preserving cost transparency.
• AIA A103-2017: Cost of the work plus a fee without a GMP. Open book, no ceiling.

A102 with a GMP is common for Bay Area custom homes because it combines cost transparency with owner protection. AIA A201-2017 General Conditions sit above all three and govern change orders, progress payments, and substantial completion.

Q: What is your contingency recommendation, and where does it live?

The AIA’s position is that there is no one-size-fits-all contingency percentage. Industry ranges are commonly cited at 5 to 10% for straightforward projects and 10 to 20% for complex custom homes. Ask whether the contingency sits in the owner’s budget or the contractor’s budget, and who can draw against it.

Q: What does your down payment structure look like?

California Business and Professions Code §7159.5 caps home improvement contract down payments at 10% of the contract price or $1,000, whichever is less. Ground-up new construction is not always classified as a home improvement contract, so ask how the builder structures the initial payment and how it ties to the construction loan closing.

Q: How many draws do you structure on a typical custom home construction loan, and have you worked with my lender?

Typical new custom home construction loans are structured around five to seven draws tied to phase completion (foundation, rough framing, mechanicals rough-in, dry-in, drywall, finishes, final). Each draw package includes subcontractor invoices, photo documentation, a budget recap, and conditional lien waivers from each paid trade. A third-party lender inspector verifies phase completion before funds release; inspection fees typically run $50 to $100 per draw, with funds released 24 to 48 hours after approval.

If your builder has never managed a draw schedule with your lender, your lender relationship becomes your problem.

Q: What is your change-order policy?

Per B&P §7159, changes to a home improvement contract must be in writing and signed before the change work begins. A compliant change order describes scope, added or subtracted cost, and the payment-schedule effect. Ask about markup on change orders and whether the builder distinguishes owner-directed changes from constructability-driven changes.

See our detailed guide on change-order contract protections for what to lock in writing.

6. Site Supervision, Schedule, and Communication

Q: Who is my day-to-day superintendent, and how many other active projects do they run?

One superintendent running six projects is not the same as one superintendent running two. On a custom home with 40 to 60 subcontractor trips through the site, the superintendent’s bandwidth is your quality control.

Q: What is your Owner/Architect/Contractor (OAC) meeting cadence?

Weekly OAC meetings are standard on active construction. Monthly is too thin. Ask who attends, how minutes are recorded, and how RFIs and submittals are tracked.

Q: How far in advance do you procure long-lead items?

Windows, custom millwork, specialty appliances, and certain structural steel can have 12 to 20 week lead times. A builder who waits until framing is complete to order windows is building a delay into your schedule.

7. References, Closeout, and Warranty

Q: Can I walk an active job site and see the last two homes you closed out?

Treat unverifiable answers as if the builder said nothing. The active job site shows you how they run work in real time. The closed-out homes show you what their punch list looks like 6 to 12 months later.

Q: What is your warranty, and what does the closeout package include?

Ask for a sample closeout binder: signed Certificate of Occupancy, closed-out permit cards, warranty documentation on every installed system, operations manuals, and a maintenance schedule. A 12-month comprehensive warranty on workmanship is standard; manufacturer warranties on systems and finishes run longer.

Q: How do you handle the mechanic’s lien framework on closeout?

Under California Civil Code §8412, a direct contractor’s lien must be recorded before the earlier of 90 days after completion or 60 days after the owner records a Notice of Completion. Non-direct claimants operate under §8414 with a 30-day window after NOC. A qualified builder delivers unconditional final lien waivers (per §8138) from every sub and supplier at closeout.

See our guide on mechanics liens for California homeowners for the full framework.

How to Verify the Answers

Run the verification in parallel with the interview, not after:

• Verify CSLB license, bond, and workers’ comp at cslb.ca.gov.
• Review the certificate of insurance directly from the insurance carrier, not from the builder. Our COI checklist walks through what to confirm.
• Call references by phone. Email introduces filtering; phone does not.
• Walk one active job site and request closed-out permit cards on two recent projects.
• Check the builder’s portfolio for ground-up homes in your city, not just the Bay Area generally.

The Bottom Line

A ground-up custom home is an 18 to 36 month partnership. The interview is where you decide whether the partnership has a chance. Timelines vary based on permit processing, inspection scheduling, trade availability, weather, and material lead times, and costs fluctuate based on market conditions, trade availability, and site access constraints. Those variables are the reason the interview matters. You are choosing the team that will absorb them.

If you are shortlisting Bay Area custom home builders, contact Custom Home Design and Build to walk through our two-phase process, our AIA-aligned design deliverables, and our approach to construction loan coordination.

All pricing and timeline references are approximate, reflect 2026 Bay Area market conditions, and are subject to change. Every project is unique. Final costs and schedules are determined on a project-by-project basis during our design phase.