ADU Regulations in Sebastopol, California (2026)

Regulations at a glance

Local rules & notes

60-Day Deemed Approval: An application for an ADU or JADU is deemed approved if the local agency has not approved or denied it within 60 days. HOA Review Prohibition: Homeowners’ associations are prohibited from influencing or reviewing ADU applications, as third-party reviews violate state law. 5-Year Enforcement Delay: Owners of substandard ADUs can request a 5-year delay in code enforcement to correct non-health/safety violations.

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

Frequently asked questions about ADU regulations in Sebastopol

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

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

• What are the setback requirements for ADUs in Sebastopol?

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

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

  In Sebastopol, 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 Sebastopol or county planning for your zone.

• Is ADU approval ministerial in Sebastopol?

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

• Are there parking requirements for ADUs in Sebastopol?

  In Sebastopol, 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 Sebastopol planning for your address.