Quick Answer: The difference between Bay Area home builders is rarely craftsmanship, because most licensed builders here can build to code. It is how they price site conditions, how they handle allowances, and whether they run the engineering before quoting. A builder who gives you a firm number before a soils report exists is guessing, and the guess becomes your change order. Ask five specific questions and the field separates fast.
Bay Area homeowners choosing a builder usually compare portfolios and per-square-foot numbers, which are the two least predictive things available. A beautiful portfolio tells you a photographer visited. A low per-foot rate usually tells you something has been excluded.
Here is what actually predicts how a project goes.
1 · Did they price the site, or just the house?
This is the single biggest differentiator in this region, because Bay Area sites are difficult in specific and expensive ways.
| Site condition | Cost if present | Common where |
|---|---|---|
| Expansive clay soil requiring piers or a mat | $45,000 – $140,000 | Much of the valley floor |
| Slope requiring retaining and stepped foundations | $60,000 – $220,000 | Foothills, Los Gatos, hillside Fremont |
| Protected trees restricting the building envelope | $8,000 – $40,000 | Palo Alto, Los Altos, Menlo Park |
| Long utility runs | $25,000 – $90,000 | Deep lots, rural parcels |
| Seismic upgrades on an existing foundation | $35,000 – $85,000 | Any pre-1975 house being added to |
The question to ask: “What does your number assume about the soil, and have you seen a soils report for this lot?” A builder who says the number assumes a standard slab and will change if the soils report says otherwise is being honest. A builder who says it is all included, without having seen a report, is not.
2 · What are the allowances set at?
An allowance is a placeholder for something not yet selected: cabinets, tile, appliances, fixtures. Two bids can look $150,000 apart and be identical except for allowances.
Ask for the allowance schedule as a separate document. Then check the numbers against reality:
- Kitchen cabinetry allowance under $45,000 on a custom home in this market is optimistic
- Tile allowance quoted per square foot with no labour is only half the cost
- Appliance allowance under $25,000 will not cover what most Bay Area buyers expect
- Lighting allowance is the one most often set unrealistically low
A low allowance is not a lower price. It is a change order scheduled for month nine.
3 · Who carries the engineering, and when is it done?
Structural engineering, soils, civil and Title 24 are separate from architectural drawings and cost $25,000 to $90,000 on a custom home. Two things matter:
Is it in the number? Sometimes yes, sometimes it is your cost. Bids differ on this and it is worth $50,000 of clarity.
Is it done before or after the price? A builder who quotes after the structural drawings exist is quoting the actual building. One who quotes from architectural drawings alone is quoting an assumption about how it will be framed and founded.
4 · How do they handle the permit process?
Bay Area jurisdictions differ enormously, and a builder who works across them knows the difference. Ask which agency your project goes to and what the current plan check time is. A builder who works in your city can answer immediately.
| Jurisdiction | Typical plan check for a new home | What it is strict about |
|---|---|---|
| Palo Alto | 4 – 9 months | Trees, individual review, historic |
| Mountain View | 3 – 6 months | Daylight plane, design review |
| San Jose | 3 – 6 months | Coverage, floor area ratio, daylight plane |
| Los Altos | 5 – 10 months | Design review, neighbour notification |
| Santa Clara | 2 – 5 months | Straightforward by comparison |
A builder who is vague about this either does not work in your city often or is not the one handling permitting, which you should know either way.
5 · What does the contract say about change orders and schedule?
Read three clauses before anything else:
- Change order pricing. Is markup on changes a stated percentage, or decided later? Later means whatever they choose.
- Schedule and what happens if it slips. A contract with no completion date and no consequence is not a schedule.
- Allowance reconciliation. If you spend under an allowance, do you get the difference back? Some contracts say yes, some are silent, which means no.
Also check whether there is a contingency line. A two-year Bay Area build with no contingency in the number is not a more competitive bid, it is a less honest one, and the contingency will appear later as change orders you did not plan for.
What the licence and insurance check should cover
- Active CSLB licence, verifiable on the state board’s site, with the classification appropriate to the work
- Workers’ compensation, current, not lapsed
- General liability at a limit appropriate to your project value
- Bond status and any history of complaints or disciplinary action
This takes ten minutes online and eliminates a category of problem entirely.
What portfolios do and do not tell you
A portfolio shows finish quality and taste, which matter. It does not show whether those projects came in near budget, finished near schedule, or generated disputes.
The more useful request: ask for two references from projects completed 18 to 36 months ago, not last month. Recent clients are still in the glow. Clients two years out have lived with the work, discovered any defects, and can tell you how warranty issues were handled.
Ask those references one question: “What was the final number against the contract, and why did it change?”
The five questions, together
- What does your price assume about the soil, and have you seen a soils report?
- Can I see the allowance schedule as a separate document?
- Is engineering in this number, and was the price set before or after the structural drawings?
- Which agency reviews this project and what is their current plan check time?
- What is the change order markup, and does it appear in the contract as a number?
A builder who answers all five specifically and without hedging is telling you how the project will run. One who deflects on three of them is telling you the same thing.
How we work
King David Home Builders builds custom homes and additions across San Jose, Palo Alto, Los Altos, Mountain View and the Peninsula. We price site work, engineering and fees as explicit line items rather than folding them into a per-square-foot number, and we run soils and structural before quoting so the price reflects the actual building. See our custom home builders page for project detail and references.
Frequently Asked Questions
What should I look for in a Bay Area home builder?
Not the portfolio or the per-square-foot rate, which are the least predictive things available. Look at how they price site conditions, whether their allowance schedule is realistic, whether engineering is in the number and was completed before pricing, whether they know your jurisdiction’s actual plan check times, and whether change order markup appears in the contract as a stated number.
Why are two builder bids so far apart?
Usually allowances and exclusions rather than quality. A kitchen cabinetry allowance of $30,000 against $70,000 makes two bids look $40,000 apart when they are identical builds. Site work, engineering, fees, landscaping and solar are also commonly excluded from one bid and included in another. Compare scope documents, not totals.
What site conditions cost the most in the Bay Area?
Expansive clay soil requiring piers or a reinforced mat at $45,000 to $140,000, and slope requiring retaining and stepped foundations at $60,000 to $220,000. Protected trees can restrict the building envelope entirely. A builder pricing without a soils report is guessing at the largest single line item.
Should I ask for references?
Yes, but from projects finished 18 to 36 months ago rather than last month. Recent clients are still in the glow; clients two years out have lived with the work and can tell you how warranty issues were handled. Ask them one question: what was the final number against the contract, and why did it change.
Is a bid with no contingency line a better deal?
No, it is a less honest one. A two-year Bay Area build will encounter something unforeseen, and a bid with no contingency simply moves that cost into change orders you did not plan for. A stated contingency is a sign the builder has done this before.