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ADU Builders & Contractors in Winchester, CA

Winchester, CA homeowners looking to build an ADU have 89 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 Winchester starts here.

📊 ADU Quick Facts for Winchester

Avg. Cost/sqft

$197-$372

Permit Timeline

60-120 weeks

Max Size

1200 sqft

Setbacks

4ft sides

Top 89 ADU Contractors in Winchester

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#1GROSSMANN CONSTRUCTION

Winchester, CA

Grossmann Construction — licensed ADU contractor in Winchester, CA. Detached ADU construction. 19+ years experience.

View Profile📞 (408) 836 8924
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#2BURNS RANDY

Winchester, CA

Burns Randy — licensed ADU contractor in Winchester, CA. Detached ADU construction. 25+ years experience.

View Profile📞 (949) 243 4889
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#3CITIZEN ONE CONSTRUCTION

Winchester, CA

Citizen One Construction — licensed ADU contractor in Winchester, CA. Detached ADU construction. 13+ years experience.

View Profile📞 (619) 843 1534
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#4TOTAL MAINTENANCE

Winchester, CA

Total Maintenance — licensed ADU contractor in Winchester, CA. Detached ADU construction. 31+ years experience.

View Profile📞 (760) 443 4564
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#5LEAVERTON RICHARD EDWARD CONSTRUCTION

Winchester, CA

Leaverton Richard Edward Construction — licensed ADU contractor in Winchester, CA. Detached ADU construction. 18+ years experience.

View Profile📞 (951) 906 1473
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#6CALIFORNIA SIDING COMPANY

Winchester, CA

California Siding Company — licensed ADU contractor in Winchester, CA. Detached ADU construction. 9+ years experience.

View Profile📞 (951) 552 5632
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#7COMPLETE CONSTRUCTION

Winchester, CA

Complete Construction — licensed ADU contractor in Winchester, CA. Detached ADU construction.

View Profile📞 (619) 862 3860
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#8TAYLOR BUILT CONSTRUCTION

Winchester, CA

Taylor Built Construction — licensed ADU contractor in Winchester, CA. Detached ADU construction. 9+ years experience.

View Profile📞 (619) 602 2615
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#9KRAUS PAUL CONTRACTING

Winchester, CA

Kraus Paul Contracting — licensed ADU contractor in Winchester, CA. Detached ADU construction. 8+ years experience.

View Profile📞 (909) 241 3232
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#10SIERRA HOME DESIGNS

Winchester, CA

Sierra Home Designs — licensed ADU contractor in Winchester, CA. Detached ADU construction. 29+ years experience.

View Profile📞 (951) 219 8134
View All 89 Contractors →

💰 How Much Does an ADU Cost in Winchester?

Garage Conversion

$68,500 - $128,500

Converting existing garage to living space

Detached ADU

$147,000 - $322,000

New standalone unit (600-1,200 sqft)

Permit & Fees

$1,105 - $5,105

Plan check, permits, utility connections

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

❓ Frequently Asked Questions About ADUs in Winchester

How much does it cost to build an ADU in Winchester?▼
The average cost to build an ADU in Winchester ranges from $147,000 to $322,000, or approximately $197 to $372 per square foot. Garage conversions typically cost $68,500 to $128,500.
How long does it take to get an ADU permit in Winchester?▼
The ADU permit process in Winchester 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 Winchester?▼
In Winchester, 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 Winchester?▼
Winchester 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 Winchester?▼
No parking is required for ADUs in Winchester 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

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