ADU Regulations in Santa Clara, California (2026)

Regulations at a glance

Local rules & notes

Moveable Tiny Homes Allowance: The ordinance allows one movable tiny home per lot in lieu of a standard ADU, though HCD requires clarification that this cannot preclude standard ADUs. Subjective Roof Design Standard: The ordinance requires specific roof designs (hip, gable) for units over 16 feet, which HCD identifies as a non-objective standard prohibited by state law. Cumulative Size Restriction: The County imposes a 1,700 square foot cumulative limit for two ADUs, which HCD notes cannot preclude converted units created under state law.

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

Frequently asked questions about ADU regulations in Santa Clara

• What is the maximum ADU size in Santa Clara, California?

  In Santa Clara, the maximum ADU size is typically 1700 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; Santa Clara may follow state defaults or have local limits. Verify with Santa Clara planning for your specific lot.

• What are the setback requirements for ADUs in Santa Clara?

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

• What is the maximum height for an ADU in Santa Clara?

  In Santa Clara, 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 Santa Clara or county planning for your zone.

• Is ADU approval ministerial in Santa Clara?

  In Santa Clara, 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; Santa Clara planning can confirm the exact process.

• Are there parking requirements for ADUs in Santa Clara?

  In Santa Clara, 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 Santa Clara planning for your address.