San Diego ADU Cost Calculator
Get instant cost estimates for accessory dwelling units in San Diego. Garage conversions, detached ADUs, JADUs, and more with current permit costs.
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🏠 Garage Conversion
Convert your existing garage into a living space. Most affordable option using existing structure.
$80,000 - $180,000
🏘️ Detached ADU
New standalone unit in your backyard. Up to 1,200 sq ft allowed in San Diego.
$200,000 - $450,000
🔗 Attached ADU
Addition connected to main house. Shares one wall with existing structure.
$150,000 - $350,000
🛏️ Junior ADU (JADU)
Up to 500 sq ft within existing home. Most affordable new unit option.
$50,000 - $120,000
San Diego ADU FAQ
How much does an ADU cost in San Diego?
ADU costs in San Diego range from $150,000 for a garage conversion to $400,000+ for a detached new construction ADU. The average cost is $250-350 per square foot including permits and design. La Jolla, Del Mar, and Coronado typically cost 15-25% more than East County areas.
Do I need a permit for an ADU in San Diego?
Yes, all ADUs in San Diego require permits. California law streamlined the process with SB 9 and AB 68, allowing most properties to add an ADU. Permit costs typically range from $5,000-$15,000. The City of San Diego must approve plans within 60 days for ADUs under state law.
How long does it take to build an ADU in San Diego?
ADU construction in San Diego typically takes 6-12 months from permit application to completion. Permit approval takes 4-8 weeks, and construction takes 4-8 months depending on size and complexity. Prefab ADUs can reduce construction time to 2-4 months.
What is the maximum ADU size allowed in San Diego?
San Diego allows ADUs up to 1,200 square feet for detached units. Attached ADUs can be up to 50% of the main home's living area or 1,200 sq ft, whichever is less. Junior ADUs (JADUs) are limited to 500 square feet.
Can I rent out my ADU in San Diego?
Yes, ADUs can be rented as long-term rentals in all San Diego zones. Short-term rentals (Airbnb) are restricted in most residential zones and require a license. Many homeowners use ADU rental income to offset mortgage payments - typical rent is $1,800-$3,500/month in San Diego.