ADU (Accessory Dwelling Unit) construction costs in Los Angeles can vary dramatically—from $150,000 for a basic unit to $400,000 or more for a custom detached ADU. The good news? Strategic decisions during planning can save tens of thousands without sacrificing quality.
Maximize Your Existing Footprint
Garage conversion ADUs are typically 40-50% less expensive than detached new construction. If your garage meets minimum requirements, a conversion can deliver an attractive ADU at a fraction of the cost.
Streamline Your Design
Simple rectangular floor plans cost significantly less to build than complex shapes with multiple rooflines and angles. A well-designed simple ADU can be just as functional and attractive as a complex one.
Prefabricated ADU Options
California has seen a surge of high-quality prefabricated ADU options that reduce on-site construction time and cost. KM Builders works with leading prefab manufacturers to offer clients more options.
California ADU Grants and Incentives
Several programs exist to help homeowners finance ADU construction, including CalHFA's ADU Grant Program, which provides up to $40,000 in pre-development cost assistance for low-to-moderate income homeowners.