ADU Regulations in Gilroy, California (2026)

Regulations at a glance

Local rules & notes

Illegal Parking Clearance Requirement: The City attempts to require that driveway parking for ADUs must have at least 18 feet of clearance from the back of the sidewalk. HCD explicitly flags this as a violation of state law. Utility Connection Mandate: The City ordinance requires independent electrical sub-panels and water heating for ADUs. HCD notes this violates state law exceptions where utility connections are not required. Subjective Compatibility Standards: The City requires architectural details 'including, but not limited to' specific elements. HCD flags this as subjective and non-compliant with the requirement for objective standards.

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

Frequently asked questions about ADU regulations in Gilroy

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

  In Gilroy, the maximum ADU size is typically NaN 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; Gilroy may follow state defaults or have local limits. Verify with Gilroy planning for your specific lot.

• What are the setback requirements for ADUs in Gilroy?

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

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

  In Gilroy, 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 Gilroy or county planning for your zone.

• Is ADU approval ministerial in Gilroy?

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

• Are there parking requirements for ADUs in Gilroy?

  In Gilroy, 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 Gilroy planning for your address.