Bay Area New Construction Contractor — Custom Homes, Luxury Homes, Hillside & Small Multifamily

City-by-city permit complexity

There is no single 'Bay Area permit' — the nine-county region runs dozens of independent building and planning departments, each with its own plan-check cadence, design-review process, and hillside / fire / coastal overlays. San Francisco's DBI is its own world. Peninsula cities like Palo Alto, Menlo Park, Atherton, and Los Altos run discretionary architectural review for most new homes. East Bay cities (Oakland, Berkeley, Albany) add their own seismic and hillside layers.

We name the specific jurisdiction and the specific reviews in the feasibility brief instead of generalizing across the region.

Peninsula custom and luxury homes

Peninsula custom homes — Palo Alto, Menlo Park, Atherton, Los Altos, Portola Valley, Hillsborough, Woodside — typically combine large lots with discretionary architectural and design review, neighbor-notification windows, and aggressive tree-protection ordinances. Budget and schedule are driven by design review and by the construction-market labor stack as much as by the build itself.

Luxury homes in these markets push higher per-sq-ft costs because of envelope quality, indoor/outdoor integration, complex MEP, and high-end finish coordination — not because of square footage alone.

San Francisco — DBI and Planning

San Francisco residential new construction goes through both the Department of Building Inspection (DBI) and the Planning Department. SF's plan-check timelines are longer than most other Bay Area cities, and many projects trigger discretionary planning review (rear-yard, neighborhood notification, sometimes Discretionary Review at the Planning Commission).

We sequence SF projects around the discretionary calendar, not against it.

Hillside, geotech, and seismic

East Bay (Oakland Hills, Berkeley Hills, Orinda, Lafayette), Marin (Mill Valley, Tiburon, Sausalito), and Peninsula hillside parcels add geotech, slope-stability, drainage, and access layers. The Bay Area's seismic hazard maps — Alquist-Priolo earthquake fault zones and Seismic Hazard Zones (liquefaction, landslide) — change foundation and structural requirements when a parcel falls inside them.

All-electric and the 2025 California Energy Code

Many Bay Area cities have adopted local 'all-electric' or 'natural-gas-prohibited' new-construction reach codes on top of the statewide Title 24 baseline. Berkeley's original ban was overturned, but newer city ordinances structured as building-code amendments remain in force in several jurisdictions. The 2025 California Energy Code (Title 24, Part 6), effective for permits filed on/after January 1, 2026, also strengthens heat-pump and electric-readiness expectations.

We design to the actual local code in force at permit filing — not a generalized 'Bay Area' assumption.

Utility upgrades and neighbor/staging constraints

PG&E service upgrades, EBMUD or Hetch Hetchy water service, and sewer lateral conditions can add months to a Bay Area construction schedule. Tight Peninsula lots add staging and neighbor-protection constraints — protected trees, neighbor light/air, and construction-hour ordinances that vary city by city.

Small multifamily and SB9 in the Bay Area

Bay Area SB9 feasibility varies sharply by city — local implementation ordinances differ on setbacks, frontage, parking, and exemptions. Small multifamily (2–6 units) on R-zoned infill parcels is increasingly viable in San Jose, Oakland, and parts of San Mateo and Alameda counties. We screen SB9 and small-multifamily feasibility against the current state statute and the specific local ordinance.

Frequently asked questions

Do you work across all nine Bay Area counties?

Yes — San Francisco, San Mateo, Santa Clara, Alameda, Contra Costa, Marin, Sonoma, Napa, and Solano. We confirm jurisdictional detail per project.

How long does a custom home take in the Bay Area?

Typical range is 24–42 months brief-to-keys. Discretionary planning, design review, and hillside engineering push the longer end. San Francisco DBI projects sit at the longer end almost by default.

Do you work in Palo Alto, Menlo Park, and Atherton?

Yes — these are core Peninsula markets. Expect architectural review board involvement and longer discretionary timelines than most other Bay Area cities.

How much does Bay Area new construction cost?

Honest 2026 ranges land roughly $625–$1,200+ per sq ft turnkey for Peninsula custom single-family, with luxury and hillside builds pushing higher. The cost page breaks out the drivers.

Do you handle all-electric requirements?

Yes. We design to the local reach code in force at permit filing — heat pumps for space and water heating, induction-ready kitchens, and electric-readiness rough-ins where required.

Can you support discretionary planning hearings?

Yes — we sequence the design and the budget against the discretionary calendar and prepare hearing-ready documentation when required.

Do you do small multifamily in the East Bay or San Jose?

Yes — 2-unit, 3-unit, fourplex, and 5–6 unit infill on qualifying R-zoned parcels. Feasibility starts with the specific local ordinance.

Official sources

• San Francisco Department of Building Inspection (DBI) ↗

  City and County of San Francisco

  SF building permits, plan-check, and inspection.

• San Francisco Planning Department ↗

  City and County of San Francisco

  SF zoning, discretionary review, rear-yard and notification rules.

• City of Palo Alto — Planning & Development Services ↗

  City of Palo Alto

  Peninsula custom-home permitting and architectural review.

• City of Oakland — Planning & Building ↗

  City of Oakland

  East Bay permits, hillside, and Oakland-specific zoning.

• California Energy Commission — 2025 Energy Code ↗

  California Energy Commission

  Statewide Title 24 baseline effective for permits filed on/after January 1, 2026.

• California Geological Survey — Seismic Hazard Zones ↗

  California Department of Conservation

  Alquist-Priolo and Seismic Hazard Zone maps for liquefaction and landslide.

Related pages

• California New Construction hub →

  Statewide overview of ground-up residential design-build.

• Custom Homes →

  How custom homes are scoped, engineered, and built.

• Luxury Homes →

  Higher-finish custom homes in Peninsula and Marin markets.

• Hillside Construction →

  East Bay, Marin, and Peninsula slope engineering.

• Small Multifamily (2–6 unit) →

  Infill duplex, triplex, and fourplex across the Bay Area.

• Fire Rebuild →

  Post-fire rebuild planning, including Sonoma rebuild context.

• Permit Timeline →

  SF DBI and Peninsula permit-path ranges.

• New Construction Cost →

  Honest Bay Area cost ranges with named drivers.

• Bay Area Service Desk →

  Regional consultation desk and service-area detail.