ADU Regulations in San Gabriel, California (2026)

Regulations at a glance

Local rules & notes

ADU Production Contingency Incentives: The City must monitor ADU production every two years. If production rates or affordability levels are not met, the City is committed to offering additional incentives for ADU production. Elimination of Minimum Floor Area: Under Program 24, the city committed to eliminating minimum floor area requirements, which facilitates the development of smaller, more affordable ADUs. Removal of FAR Standards: The city is removing maximum Floor Area Ratio (FAR) standards for residential development in specific commercial zones to encourage higher density.

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

Frequently asked questions about ADU regulations in San Gabriel

• What is the maximum ADU size in San Gabriel, California?

  In San Gabriel, 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; San Gabriel may follow state defaults or have local limits. Verify with San Gabriel planning for your specific lot.

• What are the setback requirements for ADUs in San Gabriel?

  In San Gabriel, 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 San Gabriel planning for overlay zones or design standards that could affect your site.

• What is the maximum height for an ADU in San Gabriel?

  In San Gabriel, the maximum height for an ADU is generally 16 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 San Gabriel or county planning for your zone.

• Is ADU approval ministerial in San Gabriel?

  In San Gabriel, 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; San Gabriel planning can confirm the exact process.

• Are there parking requirements for ADUs in San Gabriel?

  In San Gabriel, parking for ADUs is generally Often waived per state law; check local ordinance. California law often waives parking for ADUs within a half-mile of transit or in certain historic districts. Check with San Gabriel planning for your address.