Building an ADU in San Diego: A Homeowner's Guide to Costs, Process & Regulations
Thinking About Adding an ADU in San Diego?
Whether you’re a homeowner exploring long-term value or a real estate investor looking to boost monthly income, Accessory Dwelling Units (ADUs) are one of California’s most powerful real estate investments.
Our free guide breaks it all down—from zoning and design to costs, ROI, and permitting in San Diego.
What You’ll Learn Inside This Free ADU Guide:
What is an ADU?
An Accessory Dwelling Unit (ADU) is a self-contained living space on the same lot as a primary residence. Common types include:
Discover the 3 most common types of ADUs (Detached, Garage Conversions, and Attached) and what makes them eligible for your property.
Detached ADUs (standalone structure)
Garage Conversions (repurposed existing garages)
Attached ADUs (connected to the main home)
Step-by-Step: Building an ADU in San Diego
Understand the full process—feasibility checks, design, city permits, construction, inspections—mapped out clearly so you know what to expect.
The San Diego Process
Feasibility Review – Property evaluation and zoning review
Design Phase – Work with our experts to craft a layout
Permitting – Submit plans to the City of San Diego
Construction – Built to code with quality materials
Final Inspection – City approval for occupancy
How Much Does an ADU Cost?
Get realistic price ranges (based on San Diego market averages):
Garage Conversion: $80K–$130K
Detached ADU: $250–$500 per sq. ft.
Average ROI: ADUs can deliver 70–120% and boost resale value, depending on size and rental use.
*According to the California Department of Housing and Community Development, ADUs can increase a property’s value by up to 30% and offer strong rental income potential in urban areas.
What Regulations Should You Know?
Learn about zoning laws, California’s SB 9 & 10 legislation, and what recent changes mean for homeowners.
Your Top ADU Questions Answered
How long does it take? ~6–9 months depending on permitting
Can I build an ADU on my property? Most single-family and multifamily lots in San Diego qualify
Any new regulations? Yes. California SB 9 & 10 make ADU construction faster and more flexible for homeowners
Why This Matters:
California now allows more flexibility than ever before to build, rent, and invest in ADUs—especially in San Diego. This is your opportunity to create a long-term income stream, add family living space, or increase your property’s value with expert guidance from a licensed general contractor who knows the local market.
Why Homeowners Trust JB Construction & Renovations:
✅ Local expertise in San Diego ADU permitting & planning
✅ Over 10 years of custom renovation experience
✅ Fully licensed and insured California general contractor
✅ Transparent pricing and planning
✅ Commitment to modern, sustainable construction