ADU Regulations in Tiburon, California (2026)

Regulations at a glance

Local rules & notes

Conversion of Unpermitted Structures: The city must allow the conversion of existing space into an ADU even if the original structure was not lawfully constructed or permitted. Front Setback Preclusion: The city cannot enforce front yard setbacks (such as the 30-foot requirement in Precise Plan Areas) if they would prevent an 800 sqft ADU from being built. JADU in Attached Garages: Attached garages are considered part of the residence and can be converted into JADUs.

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

Frequently asked questions about ADU regulations in Tiburon

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

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

• What are the setback requirements for ADUs in Tiburon?

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

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

  In Tiburon, 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 Tiburon or county planning for your zone.

• Is ADU approval ministerial in Tiburon?

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

• Are there parking requirements for ADUs in Tiburon?

  In Tiburon, 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 Tiburon planning for your address.