ADU Regulations in Los Angeles, California (2026)

Regulations at a glance

Local rules & notes

Methane Zone Mitigation: Specific slab-on-grade requirements apply if the ADU is located within a designated Methane Zone. Replacement Parking Waiver: Unlike many jurisdictions, LA explicitly states replacement parking is not required when a garage is demolished for an ADU. Fire Rating for Proximity: Exterior walls and openings must have a 1-hour fire rating if located less than 3 feet from an adjacent structure.

For the official ordinance and latest updates, check your city or county planning department.

Frequently asked questions about ADU regulations in Los Angeles

• What is the maximum ADU size in Los Angeles, California?

  In Los Angeles, the maximum ADU size is typically 1200 square feet, depending on whether the unit is attached or detached. California state law allows up to 1,200 sq ft for detached ADUs and 800 sq ft for attached in many jurisdictions; Los Angeles may follow state defaults or have local limits. Verify with Los Angeles planning for your specific lot.

• What are the setback requirements for ADUs in Los Angeles?

  In Los Angeles, typical setback requirements are 4 feet from the side property line and 4 feet from the rear. These may be reduced to 4 feet under California Government Code § 65852.2 where applicable. Check with Los Angeles planning for overlay zones or design standards that could affect your site.

• What is the maximum height for an ADU in Los Angeles?

  In Los Angeles, the maximum height for an ADU is generally 20 feet. State law often allows up to 16 feet for detached ADUs and up to 25 feet when within 4 feet of the property line in some cases. Confirm with Los Angeles or county planning for your zone.

• Is ADU approval ministerial in Los Angeles?

  In Los Angeles, ADU approval is typically Ministerial (by-right) per Gov Code §65852.2. Ministerial (by-right) review means the city must approve qualifying applications without discretionary review, per California Gov Code § 65852.2. Your project must still meet objective standards; Los Angeles planning can confirm the exact process.

• Are there parking requirements for ADUs in Los Angeles?

  In Los Angeles, parking for ADUs is generally true. California law often waives parking for ADUs within a half-mile of transit or in certain historic districts. Check with Los Angeles planning for your address.