The maximum size of a detached or attached ADU in Los Angeles is 1,200 square feet under current California law, with up to 2 bedrooms permitted. Junior ADUs (JADUs) are capped at 500 square feet and must be built within the existing primary single-family home.

Local jurisdictions cannot impose smaller size limits than state law allows. Some homeowners assume 800 sq ft is the maximum — that was the previous standard, but current law (Government Code § 66323) explicitly allows ADUs up to 1,200 sq ft. Two-story ADUs are also allowed subject to local height limits.

Yes. Every ADU in Los Angeles requires a building permit from LADBS or the relevant local jurisdiction (Beverly Hills, Santa Monica, Pasadena, etc., each have their own building departments). California law mandates plan review be completed within 60 days; if the local agency doesn’t act in time, the application is automatically approved.

Building an unpermitted ADU exposes you to retroactive fines, potential demolition orders, and inability to legally rent or sell the unit. AB 2533 (2025) provides a path to legalize unpermitted ADUs built before January 1, 2020 — but for any new construction, a permit is non-negotiable

No — under AB 976 (effective for ADUs permitted after January 1, 2020), owner-occupancy is no longer required for detached ADUs. Both the primary home and the ADU can be rented to separate tenants.

Junior ADUs (JADUs) are the exception — JADUs still require the owner to occupy one of the units (either the primary home or the JADU itself). For all other ADU types (detached, attached, garage conversion, internal, basement), owner-occupancy is not required.

In some California cities, yes. AB 1033 (2024) allows local jurisdictions to adopt ordinances permitting ADUs to be sold as separate condominium units. The City of Los Angeles is a participating city.

The process requires condominium plan recordation, safety inspections, creation of a Homeowners Association under the Davis-Stirling Act, and independent utility metering. It’s not simple, and adoption is still relatively new — but it opens significant new exit options for ADU developers and homeowners. We help LA clients evaluate AB 1033 separation feasibility during ADU design.

California state law caps mandatory side and rear setbacks at 4 feet under AB 2221. Local jurisdictions cannot require larger setbacks for ADUs.

Front setback requirements remain in place but cannot be applied to prevent an ADU under 800 sq ft from being built. Detached ADUs must also be at least 4 feet from any property line and follow local building separation requirements (typically 10 feet from the primary residence). On smaller lots, the 4-foot setback rule is often what makes an ADU buildable that wouldn’t have been a few years ago.

In most cases, no. ADUs within ½ mile of public transit, on lots in historic districts, in permit-parking neighborhoods, or in car-share zones are exempt from off-street parking requirements. Most of LA falls into one of these categories.

Garage conversion ADUs do not require replacement parking under California law — the parking spaces lost to the conversion don’t have to be replaced elsewhere on the lot. SB 1211 extended this to include uncovered parking spaces converted to ADUs on multifamily lots.

Yes — garage conversion is the most common and cost-effective ADU type in Los Angeles, typically costing $80,000–$200,000. The structural envelope already exists, which dramatically reduces foundation, framing, and roofing costs.

A garage conversion to ADU includes adding insulation, mechanical ventilation, plumbing, electrical, kitchen, bathroom, egress windows, and finished surfaces. Garage conversions to ADUs do not require off-street parking replacement under California law. Most garage-to-ADU projects clear plan check and complete construction in 4–7 months.