Build Your
Dream ADU
in Southern California

ADU construction costs in Southern California typically range from $280 to $375 per square foot. A 400 sq ft studio starts at $100,000–$120,000. A 600 sq ft one-bedroom runs $168,000–$225,000. A 800 sq ft two-bedroom costs $224,000–$300,000. Garage conversions are more affordable at $150–$200 per square foot. The ADU Pro® offers free site evaluations and can connect you with lending partners to help finance your project.

The ADU Pro® serves homeowners in Orange County, Los Angeles County, and Riverside County, California. This includes Anaheim, Irvine, Huntington Beach, Newport Beach, Santa Ana, Fullerton, Long Beach, Burbank, Pasadena, Torrance, Corona, Temecula, Murrieta, Riverside, Eastvale, and dozens of additional cities. Contact us to confirm service to your specific address.

Yes — The ADU Pro® handles the entire permitting process. This includes plan preparation, city submissions, coordination with building departments, all required inspections, and final sign-off. Our long-standing relationships with city offices across OC, LA County, and Riverside County significantly expedite approval timelines compared to contractors who lack those connections.

A typical ADU project takes 6–12 months from initial consultation to final inspection. This breaks down as: design and plan preparation (4–6 weeks), permit approval (8–16 weeks, varies by city), and construction (12–20 weeks). Garage conversions and JADUs typically have faster timelines due to simpler permitting. The ADU Pro's city relationships often reduce permit wait times.

Yes. The ADU Pro® works with a network of preferred lending partners and financial institutions who specialize in ADU construction financing. Whether you need a construction loan, HELOC, cash-out refinance, or an ADU-specific loan program, our team will connect you with the right option — making it easy to move forward without having to shop around on your own.

Yes. The ADU Pro, Inc. holds California State License Board (CSLB) license #1128679 and carries full general liability and workers' compensation insurance. You can verify this license at cslb.ca.gov. Always verify contractor licensing before signing any contract in California.

An Accessory Dwelling Unit (ADU) is a secondary residential unit on the same lot as a primary single-family or multi-family home. Also known as granny flats, in-law suites, or backyard cottages. California state law (AB 2221, AB 916) has made it significantly easier to build ADUs — most single-family lots in Southern California are eligible. The ADU Pro® offers free site evaluations to determine your property's specific options and potential.

ADU rental income in Southern California ranges from $1,500–$4,000 per month depending on location, size, and finishes. A well-located ADU in Irvine or Newport Beach can earn $2,500–$4,000/month. In Riverside or Corona, expect $1,500–$2,200/month. Most well-built ADUs pay off their construction cost within 6–10 years, then generate pure cash flow — plus the long-term property value increase of $100,000–$250,000.

A Junior ADU (JADU) is a smaller unit, capped at 500 sq ft, created by converting attached garage space or existing interior rooms. Unlike a standard ADU, a JADU shares a wall with the primary dwelling and requires an efficiency kitchen rather than a full kitchen. JADUs are California's most affordable ADU option — starting around $85,000 — and have the fastest permit timelines. They're ideal for families adding space for a relative or generating supplemental rental income.