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Permits & plan-check · Mountain View · City of Mountain View Community Development

Mountain View ADU permits — what plan-check really looks like

Every Mountain View ADU permit runs through City of Mountain View Community Development. 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 Mountain View Community Development submittal package

A clean first submittal in Mountain View 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

Mountain View 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 Mountain View, 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 Mountain View Community Development 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.

Mountain View · Permits & plan-check

Questions Mountain View homeowners ask about permits

Direct answers, Mountain View-specific.

  1. Do Mountain View standard plans save real money?
    Yes — they cut design fees by $8K–$15K and plan-check by 4–8 weeks when parcel conditions match.
  2. Can my Mountain View ADU connect to existing electrical?
    Often yes if the panel is 200A. We confirm capacity calculation at feasibility.
  3. Does Mountain View have unique requirements that affect permits?
    Yes — City of Mountain View Community Development sets the local rules, and Mountain View has its own plan-check rhythm. The realistic numbers above reflect 2026 Mountain View conditions, not statewide averages.

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