ADU Builders San Diego: Complete Guide to Finding the Best Contractor [2026]
Looking for the best ADU builders in San Diego? Learn how to choose a licensed ADU contractor, what to expect, and why One Stop Builders is trusted by homeowners.
If you're searching for ADU builders in San Diego, you're making one of the smartest home investments possible. Accessory Dwelling Units (ADUs) are transforming San Diego properties, offering rental income potential of $2,000-$4,000 per month while significantly increasing property values.
What to Look for in San Diego ADU Builders
Not all contractors are created equal when it comes to ADU construction. Here's what separates the best ADU builders in San Diego from the rest:
1. Valid California Contractor License
Always verify your contractor's license on the California State License Board (CSLB) website. For ADU construction, you need a General Building Contractor (Class B) license. One Stop Builders holds License #1101128.
2. ADU-Specific Experience
ADU construction involves unique challenges including:
- San Diego ADU regulations and setback requirements
- Utility connections and separate metering
- Parking requirements (or exemptions)
- Maximum size limitations by zone
- Junior ADU (JADU) conversion options
3. In-House Design and Permitting
The best San Diego ADU builders handle architectural plans, engineering, and permit applications in-house. This streamlines the process and avoids delays from coordinating multiple vendors.
San Diego ADU Regulations 2026
California's ADU laws are among the most favorable in the nation. Key points for San Diego:
- Maximum Size: 1,200 sq ft for detached ADUs (or 50% of main home, whichever is less in some zones)
- Height: Up to 16-25 feet depending on zone and ADU type
- Setbacks: 4 feet minimum from side and rear property lines
- Parking: No additional parking required in most cases
- Owner Occupancy: No owner-occupancy requirement through 2025 (extended)
ADU Construction Timeline in San Diego
A typical ADU project takes 8-14 months from initial consultation to move-in:
- Design and Planning: 4-8 weeks
- Permit Approval: 4-12 weeks (San Diego Development Services)
- Construction: 4-6 months for detached ADU
- Final Inspections: 2-4 weeks
Why Choose One Stop Builders for Your San Diego ADU?
As licensed ADU builders in San Diego, One Stop Builders offers:
- 15+ years of residential construction experience
- All trades in-house (plumbing, electrical, framing, finish work)
- Complete design-build services including architectural plans
- Permit handling with San Diego Development Services
- Transparent pricing with detailed, itemized estimates
- Licensed, bonded, and insured (CA #1101128)
Get Started with Your ADU Project
Ready to explore ADU construction for your San Diego property? Contact One Stop Builders at (858) 567-0007 for a free consultation and site evaluation.