ADU Regulations in Vernon, California (2026)

Regulations at a glance

Local rules & notes

Frost-Free Foundation Requirement: All ADUs, regardless of size, must be placed on and secured to a permanent frost-free perimeter foundation. Non-Conforming Structure Conversion: Existing accessory structures that do not meet current height or setback requirements may be converted into ADUs as long as the non-compliance is not increased. Primary Footprint Size Cap: The size of the ADU is strictly limited by the footprint of the primary structure if that footprint is smaller than 800 square feet.

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

Frequently asked questions about ADU regulations in Vernon

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

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

• What are the setback requirements for ADUs in Vernon?

  In Vernon, typical setback requirements are 5 feet from the side property line and 8 feet from the rear. These may be reduced to 4 feet under California Government Code § 65852.2 where applicable. Check with Vernon planning for overlay zones or design standards that could affect your site.

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

  In Vernon, the maximum height for an ADU is generally 10 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 Vernon or county planning for your zone.

• Is ADU approval ministerial in Vernon?

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

• Are there parking requirements for ADUs in Vernon?

  In Vernon, 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 Vernon planning for your address.