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ADU Builders & Contractors in Napa, CA

Napa, CA homeowners looking to build an ADU have 402 licensed contractors to choose from, ready to help. Whether you're planning a garage conversion, detached ADU, or junior ADU, finding the right contractor in Napa starts here.

📊 ADU Quick Facts for Napa

Avg. Cost/sqft

$208-$383

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 402 ADU Contractors in Napa

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#1ALTURA CONSTRUCTION INC

Napa, CA

Altura Construction Inc — licensed ADU contractor in Napa, CA. Detached ADU construction. 21+ years experience.

View Profile📞 (707) 255 7790
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#2MAGANA CONSTRUCTION

Napa, CA

Magana Construction — licensed ADU contractor in Napa, CA. Detached ADU construction.

View Profile📞 (707) 287 5452
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#3ADL CONSTRUCTION

Napa, CA

Adl Construction — licensed ADU contractor in Napa, CA. Detached ADU construction. 25+ years experience.

View Profile📞 (707) 738 8206
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#4MIHM RANDY

Napa, CA

Mihm Randy — licensed ADU contractor in Napa, CA. Detached ADU construction. 34+ years experience.

View Profile📞 (707) 299 7267
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#5SCOTT MATTHEW CONSTRUCTION

Napa, CA

Scott Matthew Construction — licensed ADU contractor in Napa, CA. Detached ADU construction. 9+ years experience.

View Profile📞 (707) 372 4090
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#6ALACIN ENTERPRISES INC

Napa, CA

Alacin Enterprises Inc — licensed ADU contractor in Napa, CA. Detached ADU construction. 14+ years experience.

View Profile📞 (707) 224 5912
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#7DAVIS RON GENERAL CONTRACTOR

Napa, CA

Davis Ron General Contractor — licensed ADU contractor in Napa, CA. Detached ADU construction. 27+ years experience.

View Profile📞 (707) 888 3056
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#8HANSON CONSTRUCTION

Napa, CA

Hanson Construction — licensed ADU contractor in Napa, CA. Detached ADU construction. 39+ years experience.

View Profile📞 (707) 258 8016
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#9K B DIVERSIFIED

Napa, CA

K B Diversified — licensed ADU contractor in Napa, CA. Detached ADU construction. 35+ years experience.

View Profile📞 (707) 260 4034
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#10PERALTA CONSTRUCTION CO

Napa, CA

Peralta Construction CO — licensed ADU contractor in Napa, CA. Detached ADU construction. 44+ years experience.

View Profile📞 (707) 695 1779
View All 402 Contractors →

💰 How Much Does an ADU Cost in Napa?

Garage Conversion

$74,000 - $134,000

Converting existing garage to living space

Detached ADU

$158,000 - $333,000

New standalone unit (600-1,200 sqft)

Permit & Fees

$1,097 - $5,097

Plan check, permits, utility connections

* Costs vary based on size, finishes, site conditions, and contractor. Get quotes from multiple Napa contractors to compare pricing.

❓ Frequently Asked Questions About ADUs in Napa

How much does it cost to build an ADU in Napa?▼
The average cost to build an ADU in Napa ranges from $158,000 to $333,000, or approximately $208 to $383 per square foot. Garage conversions typically cost $74,000 to $134,000.
How long does it take to get an ADU permit in Napa?▼
The ADU permit process in Napa typically takes 60 to 120 weeks. California law requires cities to approve or deny ADU permits within 60 days of receiving a complete application.
What are the ADU size limits in Napa?▼
In Napa, detached ADUs can be up to 1200 square feet. Attached ADUs are limited to 50% of the primary dwelling or 1,200 sqft, whichever is less. Junior ADUs (JADUs) are limited to 500 sqft and must be within the existing home.
What is the setback requirement for ADUs in Napa?▼
Napa requires 4-foot setbacks from side property lines and 4-foot setbacks from rear property lines for new ADU construction. Converted structures (like existing garages) may maintain their current setbacks.
Do I need to provide parking for my ADU in Napa?▼
No parking is required for ADUs in Napa if your property is within half a mile of public transit, in a historic district, part of an existing multi-family building, or if the ADU is a garage conversion. Otherwise, one space may be required.

Also See ADU Contractors In

Los Angeles (3215)San Diego (2582)San Francisco (2170)Sacramento (1551)Riverside (925)Fresno (904)Anaheim (784)Irvine (760)

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