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Cost guide · Mountain View · City of Mountain View Community Development

Mountain View ADU cost guide — every line, no surprises

A fixed-price Mountain View ADU contract is the sum of five line items: base build, City of Mountain View Community Development permits and fees, design and engineering, sitework and utilities, and finishes. Below is how each one moves in Mountain View specifically — and where homeowners get burned by quotes that hide them.

City-specific deep dives

Base build — what $/sqft actually covers

Base build in Mountain View runs $385–$520 per square foot for a detached one-bedroom ADU at 2026 pricing. That number assumes Title 24 compliance, code-minimum insulation, mid-grade finishes, and standard MEP. Anything below $360/sqft in Mountain View is either skipping permits, skipping engineering, or carrying allowance line-items that will balloon during construction.

City of Mountain View Community Development fees & soft costs

Mountain View plan-check, school fees, sewer capacity, water meter, and utility connection fees typically land between $14,000 and $28,000. The variance is driven by lot conditions: a flat Mountain View lot on existing sewer is the low end; a hillside lot needing a new lateral and water tap is the high end. We pull these numbers at feasibility, not after deposit.

Design, engineering, and soils

Architectural design, structural engineering, Title 24 compliance, and (when Mountain View requires it) a geotechnical report typically run 8–11% of project cost. Hillside-zoned parcels and properties within special review overlays push this higher. We disclose the engineering scope up front so the design fee isn't a moving target.

Sitework, utilities, and the hidden 15%

Sitework in Mountain View — demolition, grading, retaining if needed, sewer tie-in, water service upgrade, electrical panel upgrade to 200A — is where most "cheap" quotes blow up. Older Mountain View homes nearly always need a panel upgrade and often a lateral upgrade. Budget 12–18% of project cost here. We scope this at survey, before contract.

Finishes — the only line you actually control

Finish allowances (cabinets, counters, flooring, fixtures, appliances) are the single line a Mountain View homeowner can move materially up or down. Going from builder-grade to mid-luxe adds roughly $35–$60 per square foot. Going to luxury finishes can add $90+/sqft. We model three finish tiers at design so the trade-off is visible, not buried.

Mountain View · Cost guide

Questions Mountain View homeowners ask about cost

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 cost?
    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.

Continue researching Mountain View

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