ADU builders in Mountain View, California

Quoted from Mountain View’s own fee schedule (current as published 2026-08-14). These are city fees only. They do not include what a builder charges to design and build the unit.

Plan check

basis percentage of permit fee
detail Building Permit Plan Check Review = 65% of building permit. Electrical, Fire, Mechanical, Plumbing Plan Check Review each = 65% of the corresponding permit. Planning Staff Review, Single-Family Residential, Duplex, ADU - Additions or New Construction: $388 ($408 effective August 22, 2026).
as of 2025-08-09

Building permit

basis valuation-based table; valuation must minimally align with ICC valuation by construction type
detail $1-$500: $74. $501-$2,000: $74 + $9 per additional $100. $2,001-$25,000: $218 + $44 per additional $1,000. $25,001-$50,000: $1,234 + $31 per additional $1,000. $50,001-$100,000: $2,030 + $22 per additional $1,000. $100,001-$500,000: $3,135 + $17 per additional $1,000. $500,001-$1,000,000: $10,202 + $15 per additional $1,000. $1,000,001 and up: $17,695 + $11 per additional $1,000. Technology Fee: 5% of the total permit cost of each building and fire permit.
effective 2026 08 22 $77 / $77 + $10 per $100 / $229 + $46 / $1,300 + $33 / $2,139 + $23 / $3,304 + $18 / $10,752 + $15 / $18,650 + $11
electrical permit new house or addition $11 per 100 sq. ft. of floor area including garage ($11.10 effective 2026-08-22), plus $74 permit issuance fee ($77 effective 2026-08-22)
as of 2025-08-09

School district fees

rate Not calculated or collected by the City; paid directly to the school district(s).
threshold stated by city School Impact Fees: All new residential square footage (new construction or conversion of existing square footage) greater than 500 square feet will be subject to School Impact Fees, which is due to the School District(s) prior to building permit issuance to start construction. The City requires proof of payment to the School Districts prior to issuing the building permit.
as of page current as of 2026-08-14

Utility connections

water capacity fee Single-Family Detached Units (Class 1) $9,169 per unit ($9,389.06 effective 2026-08-22); Multi-Family and Mobile Home Units (Class 3) $5,501 per unit ($5,633.02 effective 2026-08-22).
sewer capacity fee Single-Family Detached Units (Class 1) $7,737 per unit ($7,922.69 effective 2026-08-22); Multi-Family and Mobile Home Units (Class 3) $5,416 per unit ($5,545.98 effective 2026-08-22).
excavation permit An excavation permit for a new or upgraded utility connection or construction in the public right-of-way. Fee of up to $12,000 depending on the amount of utility improvements and construction in the public right-of-way.
sewer lateral inspection Required. The City requires inspection of the pipe connecting private plumbing to the City sewer main.
adu specific exemption verbatim Note: For building conversions into an ADU or JADU that involve the correction of a nonconforming zoning condition, building code violation, or unpermitted structure, no impact fees or connection/capacity fees will be charged unless new utility infrastructure is required to meet standards per Section 17920.3 of the Health and Safety Code.
source https://developmentpermits.mountainview.gov/about-permits/fees-development, effective August 9, 2025
as of 2025-08-09

Impact fees

citywide transportation fee Single-Family Units (attached or detached) $6,126 per net new unit ($6,273.15 effective 2026-08-22); Multi-Family Residential Units $3,431 per net new unit ($3,513.78 effective 2026-08-22).
park land dedication in lieu fee Low Density (1-6 du/acre) $160 to $210 per sq. ft. of land area, $6.9 to $9.1 million per acre; Medium-Low Density (7-12 du/acre) $190 to $230 per sq. ft.
bmr in lieu Rental Housing (for low and moderate incomes) $117.65 per net new habitable sq. ft. ($98 effective 2026-08-22). All residential projects are required to provide 15% BMR units on-site; payment of an in-lieu fee may be allowed when the requirement results in a fractional BMR unit less than 0.5.
land use document fee 0.24% of construction valuation, collected on all projects at building permit
city statement on adus The only ADU-related fee exemption published is the conversion/code-correction note quoted under utility_connection_fees. There is no statement anywhere on the ADU page or the Development Fees page about the sec. 66311.5 under-750 impact fee exemption for new-construction ADUs.

Worked example

verbatim Typical permit fees (includes inspections): For New Construction ADU: building permit fees of $7,000 to $13,000, which is based on a construction valuation (cost of labor and materials) range of $100,000 to $300,000, and if applicable, an excavation permit fee of up to $12,000, depending on the amount of utility improvements and construction in the public right-of-way. For Conversion of Existing Building Area into an ADU: building permit fees of $3,000 to $5,000, which is based on a construction valuation range of $25,000 to $50,000. For a JADU: building permit fees of $4,000 to $6,000, which is based on a construction valuation of $25,000 to $35,000.
source url https://developmentpermits.mountainview.gov/residential/accessory-dwelling-units

Mountain View’s published schedule does not mention the exemption for ADUs under 750 square feet. California Government Code section 66311.5(c)(1) bars a local agency from imposing impact fees on an accessory dwelling unit of less than 750 square feet. If you are quoted impact fees on a unit that size, ask the city which section authorises them.

Mountain View fee schedule

Common questions

These came up when looking for ADU builders in Mountain View but did not meet the bar for the list above, usually because they do not advertise a California licence number, do not name Mountain View as an area they serve, or do not present accessory dwelling units as a service they offer. They are shown so the list above can be checked rather than taken on trust.

• ADU Builders Bay Area near miss
• Abodu Homes, Inc. near miss
• Asher Brothers Construction Inc. near miss
• BUILD 33 Inc. near miss
• Barcci Builders near miss
• Baron Construction and Remodeling Co. near miss
• Bay Builders & Remodeling, Inc. near miss
• Cupertino ADU Solutions near miss
• ELS Home Builders near miss
• GatherADU near miss
• Greenberg Construction near miss
• Greyhawk Construction near miss
• HAUS+ near miss
• HDR Remodeling Inc. near miss
• Ingenuity Construction Group near miss
• Joy Line Homes near miss
• Loona Construction Inc. near miss
• New Avenue Homes near miss
• New Key Construction near miss
• NuHome Remodeling near miss
• Silicon Valley Custom Homes near miss
• Sunrooms N More near miss
• Talmadge Construction, Inc. near miss
• Valley Boutique Builders near miss
• ADU Valley
• Bay Home Remodeling
• Bayside Builders Group
• California ADU Builders
• Cottage Technologies
• EBCON Corporation
• EDR Design Build
• Element Home Remodeling
• Everlast Construction
• Harrell Design + Build
• Mill Valley Builders Inc.
• Urban Shore Builders
• HomeTech Construction & Design
• M.Designs Architects
• Noland Builders, Inc.
• ODS Architecture + Interiors

1. Look the licence up yourself at cslb.ca.gov. It takes under a minute and shows the current status, any suspensions, and the bond.
2. Ask who carries workers’ compensation for the crew and for every subcontractor. A licensee with no employees may lawfully be exempt, but if someone is hurt on your property you can end up treated as the employer.
3. Ask for two recent permit numbers in any city, then look them up. A builder who has done the work can produce them immediately.
4. Get the price in writing against a drawing set. A published starting price is for a base model and rarely includes site work, utilities, or Mountain View fees.