La Jolla ADU Guide: Permits, Costs, and Rental Income Potential in 2026

Here's everything you need to know about ADUs in La Jolla in 2026.

What Is an ADU?

An ADU is a secondary residential unit built on the same lot as a primary single-family home. It can be attached to the main house, detached as a separate structure, or a conversion of an existing garage or basement. ADUs in California can be up to 1,200 square feet.

ADU Permits in La Jolla

California state law now requires cities to streamline ADU permits, and the City of San Diego has complied by creating a more predictable process. Most standard ADU designs can receive approval within a few weeks rather than months. Key requirements include setbacks of at least 4 feet from rear and side property lines for detached ADUs, a minimum ceiling height of 7 feet, separate access from the main residence, and compliance with fire and safety codes.

Cali Dream Construction handles the entire permit process for our ADU clients, making the experience as smooth as possible.

How Much Does It Cost to Build an ADU in La Jolla?

ADU construction costs in La Jolla typically range from $200,000 to $400,000 depending on size, design, and whether it's a detached new structure or a garage conversion. Garage conversions are typically less expensive, ranging from $80,000 to $150,000. A brand-new detached ADU with a full kitchen and bathroom usually runs $250,000 to $400,000 in La Jolla due to the premium labor and material costs in this market.

What Rental Income Can You Expect?

La Jolla is one of San Diego's most desirable rental markets. A well-designed ADU of 600 to 800 square feet can command $3,000 to $4,500 per month in rent, depending on location and finishes. That means a $300,000 ADU investment could generate $36,000 to $54,000 in annual rental income — a return that is hard to match with most other investments.

Is an ADU Right for Your Property?

Not every La Jolla property is ideal for an ADU. Lot size, setbacks, utility connections, and existing structures all play a role. The best first step is a site assessment by an experienced contractor who can evaluate your property and show you what's possible.

Cali Dream Construction offers free ADU consultations for La Jolla homeowners. Contact us today to find out what your property can accommodate and how quickly you could start earning rental income.