ADU Regulations in Brisbane, California (2026)

Regulations at a glance

Local rules & notes

Ordinance Null and Void Warning: HCD warns that if the city fails to submit an adopted ordinance within timelines, the local ordinance is null and void and only State Law applies. Deed Restriction Prohibition: Clarifies that deed restrictions are considered 'additional standards' and are prohibited by State Law. HOA Interference Ban: HOAs are explicitly prohibited from influencing ADU approvals or applying third-party reviews. Coastal Act Exception: Specific deadlines imposed for Coastal Development Permits (60 days) to align with ADU processing.

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

Frequently asked questions about ADU regulations in Brisbane

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

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

• What are the setback requirements for ADUs in Brisbane?

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

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

  In Brisbane, 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 Brisbane or county planning for your zone.

• Is ADU approval ministerial in Brisbane?

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

• Are there parking requirements for ADUs in Brisbane?

  In Brisbane, 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 Brisbane planning for your address.