ADU Regulations in Norco, California (2026)

Regulations at a glance

Local rules & notes

Invalid Animal Keeping Area (PAKA) Requirements: The city attempted to require ADUs to preserve specific open areas for animals (576 sqft per animal unit), which HCD ruled as an unauthorized additional standard. Prohibited Distance Between Structures: The city tried to mandate a 10-foot separation between an ADU and other buildings, which is not permitted for state-exempt units. Illegal Sprinkler Retrofit Trigger: The city attempted to force fire sprinkler installation in the primary home if an attached ADU exceeded a certain size threshold.

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

Frequently asked questions about ADU regulations in Norco

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

  In Norco, the maximum ADU size is typically 800 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; Norco may follow state defaults or have local limits. Verify with Norco planning for your specific lot.

• What are the setback requirements for ADUs in Norco?

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

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

  In Norco, 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 Norco or county planning for your zone.

• Is ADU approval ministerial in Norco?

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

• Are there parking requirements for ADUs in Norco?

  In Norco, 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 Norco planning for your address.