Verified ADU builders in San Diego.

San Diego County is one of California’s most active ADU construction markets. With high housing demand, favorable climate for year-round construction, and large suburban lots throughout the county, ADU construction in San Diego has become a practical investment for homeowners from Chula Vista to Carlsbad.

San Diego ADU construction costs are competitive and the city offers fee waivers that make it one of the more builder-friendly markets in the state. Every builder listed on this page holds an active CSLB license. License status, bond coverage, compensation insurance, and complaint history are verified daily against CSLB public records. For a complete overview of the ADU construction process in California, see our full guide.

The City of San Diego Development Services Department processes ADU permits. Under current California law (AB 68, SB 13, AB 881, AB 976), most single-family homeowners can build at least one ADU and one JADU on their property. San Diego has adopted state-compliant ADU regulations with the following key points:

• Detached ADUs: Up to 1,200 sq ft on single-family lots. Must maintain 4-foot rear and side setbacks.
• Attached ADUs: Up to 50% of the primary dwelling’s floor area, with a maximum of 1,200 sq ft.
• JADUs: Up to 500 sq ft, must be within the existing footprint of the primary dwelling or attached garage.
• Garage conversions: No additional parking replacement required under current state law.
• Permit timeline: The city is required to approve or deny ADU applications within 60 days of a complete submission.
• Fee waivers: San Diego waives development impact fees for ADUs under 750 sq ft, making smaller units significantly more affordable to build.

Construction costs vary based on ADU type, size, site conditions, and finish level. The following ranges are based on market data from San Diego-area builders:

These estimates include permitting, site preparation, construction, and basic finishes. Costs for utility connections, engineering, and design vary by project. Permit fees in San Diego typically range from $3,000 to $12,000 depending on ADU size and complexity. For a detailed breakdown, see our ADU construction cost in California guide.

Every builder on VerifiedADU goes through a multi-point verification process before appearing on this page. The following are checked against CSLB public records maintained by the California Contractors State License Board:

1. Active CSLB license — The contractor holds a current, active license with the appropriate classification for ADU construction (typically B – General Building).
2. Contractor bond — A surety bond is on file as required by California law, providing financial protection for consumers.
3. Workers’ compensation insurance — The contractor carries workers’ comp coverage or has filed a legal exemption.
4. Complaint history — The contractor’s CSLB complaint and disciplinary record is reviewed before listing. Contractors with unresolved complaints are not listed.

License data is refreshed daily. If a builder’s license status changes, their listing is updated or removed automatically. You can verify any contractor’s license independently at cslb.ca.gov. For a step-by-step guide on what to check before hiring, see how to find ADU builders near you.

San Diego follows California’s statewide ADU laws with minimal additional local restrictions. Key regulations include:

• No owner-occupancy requirement for ADUs (JADUs may have owner-occupancy requirements under certain conditions).
• No parking requirements for ADUs within half a mile of public transit.
• Impact fees are waived or reduced for ADUs under 750 sq ft.
• Lot coverage limits — San Diego allows ADU construction consistent with the underlying zone’s floor area ratio requirements.
• Height limits: Detached ADUs can be up to 16 feet (single story) or 18 feet if within half a mile of transit.
• Coastal zone: Properties in the California Coastal Zone may require additional review through the Coastal Commission, which can add time to the permitting process.

For the most current regulations, consult the City of San Diego Development Services ADU page or speak with a licensed ADU builder in our directory.

From permit submission to completion, most ADU projects in San Diego take 8 to 14 months. Permitting typically takes 4 to 8 weeks, with construction taking 4 to 8 months depending on the project scope and complexity.

Under current California law, there is no owner-occupancy requirement for standard ADUs. However, JADUs (junior ADUs) may require the property owner to occupy either the primary residence or the JADU.

Yes. California law prohibits local governments from banning long-term rental of ADUs. However, ADUs built after January 1, 2025 cannot be used as short-term rentals (less than 30 days) unless local ordinances specifically allow it.

ADU construction requires a CSLB-licensed general contractor. The typical classification is B – General Building. Specialty contractors (C classifications) may perform specific work within their license scope but cannot serve as the general contractor for a full ADU build.

According to real estate market data, a permitted ADU in San Diego typically adds 20-30% to a property’s assessed value. A 600 sq ft detached ADU on a property currently valued at $750,000 could increase the total property value by $150,000 to $225,000, depending on finish quality, location, and rental income potential.