ADU Regulations in Ventura County, California (2026)

Regulations at a glance

Local rules & notes

ADU Amnesty Program: Local agencies cannot deny a permit for an unpermitted ADU built before Jan 1, 2020, due to building standards violations unless it is a health/safety threat. Mandatory Pre-Approved Plan Fast-Track: Agencies must approve or deny within 30 days if the applicant uses a plan pre-approved by the local agency or another state agency. Multifamily ADU Bonus: Allows up to eight detached ADUs on lots with existing multifamily dwellings, provided they do not exceed the number of existing units.

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

Frequently asked questions about ADU regulations in Ventura County

• What is the maximum ADU size in Ventura County, California?

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

• What are the setback requirements for ADUs in Ventura County?

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

• What is the maximum height for an ADU in Ventura County?

  In Ventura County, 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 Ventura County or county planning for your zone.

• Is ADU approval ministerial in Ventura County?

  In Ventura County, 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; Ventura County planning can confirm the exact process.

• Are there parking requirements for ADUs in Ventura County?

  In Ventura County, 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 Ventura County planning for your address.