How to find the best ADU builders in San Diego. License verification, portfolio review, and red flags to avoid.
Building an ADU is a major investment—typically $150,000-$350,000+. Choosing the right contractor is critical. Here are the top 5 things to look for.
1. Valid California Contractor License
Verify at CSLB.ca.gov. Look for Class B - General Building Contractor. One Stop Builders: License #1101128
2. ADU-Specific Experience
Ask how many ADUs they've completed in San Diego and request to see completed projects.
3. In-House Capabilities
The best ADU builders handle most work in-house for better coordination, accountability, and quality.
4. Transparent Pricing
Look for detailed, itemized estimates with clear allowances and written contracts.
5. Portfolio and References
Review previous work, request references, and check online reviews.
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