Custom Home Design-Build in California

Custom home planning

Custom homes succeed or fail at the planning stage. Lot zoning, FAR, height, setbacks, hillside or coastal overlays, fire and historic overlays, neighbor notification, soils, and utility capacity all set the envelope before any design line is drawn. We write a one-page feasibility memo that names the envelope and the realistic budget bracket before the owner signs a design contract.

Architecture coordination

Design-build does not mean the contractor 'also draws'. It means the architect — in-house or external — works against a target budget from sketch, with continuous estimating, instead of producing a beautiful drawing set that prices 30–50% over the owner's bracket at plan-check. We coordinate the architectural package against the structural, civil, MEP, and Title 24 packages from the schematic stage forward.

Design-build process

• Feasibility

  Written zoning/FAR/overlay/budget/timeline memo. Yes/no decision gate.

• Schematic design

  Massing, plans, and an estimating bracket against your target.

• Design development

  Architecture + engineering coordinated under one schedule.

• Permit set

  Plan-check submittal, correction loops, planning where required.

• Construction

  Fixed-scope contract, weekly schedule update, monthly owner walk.

• Closeout

  Inspections, sign-off, warranty, and a documented as-built package.

Preconstruction feasibility and budget planning

Custom-home budgets fail when site conditions, finish levels, and code complexity are not priced realistically before the owner is emotionally committed. Feasibility prices each driver separately: shell, envelope, foundation type, MEP scope, interior finish level, exterior finish level, site work, soft costs, and contingency. The owner sees the same line items at every estimate revision.

Site constraints and finish level

Flat infill lots are the cheapest path to a high-finish home; hillside lots, coastal lots, fire-zone lots, and historic lots add unavoidable engineering and review cost. Finish level — flooring, millwork, doors and windows, lighting, plumbing trim, appliances, exterior cladding — typically moves a custom-home budget more than square footage does.

Engineering — structural, civil, geotech, Title 24, MEP

Custom homes pull together five engineering disciplines under one design-build contract: structural (lateral, gravity, seismic), civil (grading, drainage, stormwater), geotech (soils, slope stability, foundation recommendation), Title 24 (energy modeling, electric-readiness, ventilation), and MEP (mechanical, electrical, plumbing). Coordination problems between these packages are the single biggest source of correction-cycle slippage at plan-check.

Owner decision points and change-order control

Owners decide on plans, exterior finishes, kitchen and bath layouts, interior finishes, lighting, and fixtures on a schedule that protects the construction sequence. Decisions made after the trade is on site become change orders; decisions made on time do not. We circulate a written 'decisions due' calendar at construction start.

Construction loan and draw coordination

Construction-to-permanent loans require lender-approved budgets, draw schedules, and inspection coordination. We produce the standard documentation (AIA G702/G703 or equivalent, lien releases, photographic evidence) and we plan the construction schedule against the lender's draw cadence — not the other way around.

Frequently asked questions

Can you work with an outside architect?

Yes. Design-build does not require us to also do design. We coordinate with outside architects regularly under a contract structure that keeps each discipline accountable.

How much does a custom home cost?

Honest 2026 ranges land roughly $475–$900+ per sq ft turnkey in LA and $625–$1,200+ per sq ft turnkey on the Peninsula. The cost page names the drivers — finish, lot, engineering — that move you within the range.

How long does a custom home take?

22–42 months brief-to-keys depending on jurisdiction, discretionary review, and lot complexity. Feasibility names the realistic range for your specific project.

Do you handle hillside custom homes?

Yes — see the hillside construction page. Caissons, retaining, drainage, and access are scoped during feasibility, not after design.

Do you guarantee a fixed price?

The construction contract is fixed-scope and fixed-price against an agreed permitted drawing set. Change orders are only initiated by owner-requested scope changes, jurisdictional corrections, or genuinely concealed conditions.

How do change orders work?

Every change is priced and documented in writing before work proceeds. We do not back-bill change orders after the fact.

Will you support a construction-to-permanent loan?

Yes — including lender-approved budgets, AIA G702/G703 or equivalent draw packages, lien releases, and inspection coordination.

Official sources

• California Building Standards Commission ↗

  California DGS

  California Building Code, CALGreen, reference standards.

• California Energy Commission — 2025 Energy Code ↗

  California Energy Commission

  Title 24, Part 6 baseline effective for permits filed on/after January 1, 2026.

• CSLB License Lookup ↗

  California Contractors State License Board

  Verify CSLB #1098432 directly with the source.

Related pages

• California New Construction hub →

  Statewide overview of ground-up residential design-build.

• Luxury Homes →

  Premium custom homes with higher-finish envelopes and complex MEP.

• Teardown Rebuild →

  Demo + same-lot replacement when remodel no longer pencils.

• Hillside Construction →

  Caissons, retaining, drainage, and slope engineering.

• LA New Construction →

  LADBS, contract cities, hillside, fire rebuild.

• Bay Area New Construction →

  SF DBI, Peninsula, East Bay hillside.

• New Construction Cost →

  Honest custom-home budget ranges with named drivers.

• Design-Build Process →

  The five-stage delivery workflow from feasibility to closeout.

• Title 24 & CALGreen →

  Energy code and CALGreen strategy for custom homes.