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Permits & plan-check · Santa Monica · City of Santa Monica Building & Safety

Santa Monica ADU permits — what plan-check really looks like

Every Santa Monica ADU permit runs through City of Santa Monica Building & Safety. This is the realistic, project-manager view of that process — submittal package, plan-check rounds, the comments that come back most often, fees that hit before construction, and what separates a first-pass approval from a five-month round trip.

City-specific deep dives

City of Santa Monica Building & Safety submittal package

A clean first submittal in Santa Monica includes: site plan with setbacks and FAR calculation, architectural set (floor plans, elevations, sections, roof plan), Title 24 energy compliance, structural calcs and details, MEP plans, and the ADU-specific application packet. Missing any one of these adds two to four weeks of plan-check delay — not because plan-check is slow, but because the package goes back to the design team.

First-pass comments — the predictable ones

Santa Monica plan-checkers consistently flag the same items: setback dimensioning, fire-separation details where the ADU is close to the main house, parking math (or its waiver), egress window sizing, Title 24 documentation gaps, and missing structural connection details. A disciplined design set anticipates these. Most second-pass turnarounds are avoidable.

Fees, school fees, and utility connections

Plan-check fee, building permit, mechanical/electrical/plumbing permits, school district impact fee (if applicable), water capacity fee, and sewer capacity fee. In Santa Monica, these collectively land between $14,000 and $28,000 depending on ADU size and existing utilities. We model this at feasibility so the homeowner sees a real total, not just construction cost.

How long it actually takes in this jurisdiction

City of Santa Monica Building & Safety plan-check averages 3–5 months from submittal to permit issuance in 2026 — assuming a clean package and responsive comments. Hillside, coastal, HPOZ, or special review overlays add 4–10 weeks. We tell the homeowner the realistic window at feasibility, then track it weekly.

Santa Monica · Permits & plan-check

Questions Santa Monica homeowners ask about permits

Direct answers, Santa Monica-specific.

  1. Do I need Coastal Commission approval for a Santa Monica ADU?
    If your parcel sits in the Coastal Zone (mostly west of Lincoln), you need a Coastal Development Permit from the city. Inland parcels skip that step.
  2. Does Santa Monica rent control apply to my new ADU?
    Generally new ADUs built after the cutoff dates are not under the city's rent control ordinance — but rules evolve. We walk you through the current state at feasibility.
  3. Does Santa Monica have unique requirements that affect permits?
    Yes — City of Santa Monica Building & Safety sets the local rules, and Santa Monica has its own plan-check rhythm. The realistic numbers above reflect 2026 Santa Monica conditions, not statewide averages.

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