ADU Construction in San Diego

ADU construction costs in San Diego typically range from $150,000 to $350,000+ depending on size and type. A 500 sq ft detached ADU averages $150,000-$200,000, while larger 800-1,200 sq ft units cost $200,000-$350,000. Garage conversions are most affordable at $100,000-$180,000. Costs include design, permits, construction, utilities, and finishes.

The CalHFA ADU Grant Program provided up to $40,000 for ADU construction, but funding has been exhausted as of 2024. However, new state and local incentive programs continue to emerge. We stay current on all available financing options and can help you explore alternatives including construction loans, HELOCs, and local programs.

ADU construction typically takes 8-14 months total. Design and permitting: 3-5 months (San Diego has streamlined ADU permits). Construction: 5-9 months depending on size and complexity. Garage conversions are faster at 4-6 months total. We provide detailed timelines during consultation.

San Diego allows ADUs up to 1,200 sq ft on most residential lots. Key requirements: 4-foot rear and side setbacks (detached), must meet height limits, requires separate entrance, and needs utility connections. No parking required for ADUs near transit. Owner occupancy not required for rentals.

Yes! San Diego allows ADU rentals with no owner-occupancy requirement for properties built after January 1, 2020. You can rent to long-term tenants or, in some cases, short-term rentals depending on your neighborhood's regulations. ADUs in San Diego typically rent for $1,800-$3,500/month.

Both have advantages. Prefab ADUs offer faster timelines, fixed pricing, and lower costs ($80,000-$200,000). Custom-built ADUs provide flexibility in design, can be tailored to your lot, and often have higher quality construction ($150,000-$350,000). We build custom ADUs designed specifically for your property and needs.