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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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#1BOSS RENOVATIONS AND CONSTRUCTION INC

Winchester, CA

Boss Renovations And Construction Inc — licensed ADU contractor in Winchester, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (951) 704 3405
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#2DSDC GENERAL CONTRACTOR INC

Winchester, CA

Dsdc General Contractor Inc — licensed ADU contractor in Winchester, CA. Detached ADU construction. 18+ years experience.

View Profile📞 (714) 371 8775
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#3MADZ CONSTRUCTION INC

Winchester, CA

Madz Construction Inc — licensed ADU contractor in Winchester, CA. Detached ADU construction. 15+ years experience.

View Profile📞 (858) 449 2982
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#4ALTRUISTIC CONSTRUCTION SERVICES

Winchester, CA

Altruistic Construction Services — licensed ADU contractor in Winchester, CA. Detached ADU construction. 14+ years experience.

View Profile📞 (951) 883 2944
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#5FINAL PHASE CONSTRUCTION

Winchester, CA

Final Phase Construction — licensed ADU contractor in Winchester, CA. Detached ADU construction. 7+ years experience.

View Profile📞 (858) 776 0165
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#6BOSS RENOVATIONS AND CONSTRUCTION

Winchester, CA

Boss Renovations And Construction — licensed ADU contractor in Winchester, CA. Detached ADU construction. 9+ years experience.

View Profile📞 (951) 704 3405
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#7HILL KAREN FAY

Winchester, CA

Hill Karen Fay — licensed ADU contractor in Winchester, CA. Detached ADU construction. 37+ years experience.

View Profile📞 (951) 926 2222
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#8LUNAC CONSTRUCTION INC

Winchester, CA

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

View Profile📞 (760) 716 0908
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#9CHRISTIAN PLUMBING & HOME IMPROVEMENT

Winchester, CA

Christian Plumbing & Home Improvement — licensed ADU contractor in Winchester, CA. Detached ADU construction. 16+ years experience.

View Profile📞 (951) 837 0607
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#10CONES CONSTRUCTION

Winchester, CA

Cones Construction — licensed ADU contractor in Winchester, CA. Detached ADU construction. 16+ years experience.

View Profile📞 (951) 219 8501
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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