ADU Regulations in Montebello, California (2026)

Regulations at a glance

Local rules & notes

60-Day Deemed Approval: If the city does not approve or deny a completed ADU application within 60 days, it is automatically deemed approved by operation of law. Enforcement Delay for Unpermitted Units: Owners of ADUs built before January 1, 2020, can receive a 5-year stay on enforcement for building code violations that are not health and safety issues. HOA and Deed Restriction Ban: Homeowners Associations and deed restrictions cannot prohibit or unreasonably restrict the construction or use of an ADU.

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

Frequently asked questions about ADU regulations in Montebello

• What is the maximum ADU size in Montebello, California?

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

• What are the setback requirements for ADUs in Montebello?

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

• What is the maximum height for an ADU in Montebello?

  In Montebello, 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 Montebello or county planning for your zone.

• Is ADU approval ministerial in Montebello?

  In Montebello, 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; Montebello planning can confirm the exact process.

• Are there parking requirements for ADUs in Montebello?

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