ADU Regulations in Santa Cruz, California (2026)

Regulations at a glance

Local rules & notes

Illegal Deed Restriction Requirement: The County requires a recorded declaration of restrictions prior to permit issuance, which HCD identifies as an illegal 'additional standard'. Non-Compliant Sprinkler Mandate: The ordinance attempts to require sprinklers for detached ADUs > 1,200 sqft or large additions, but state law prohibits this if the primary dwelling lacks them. Unit Mixture Limitation: The County incorrectly limits lots to one ADU and one JADU, whereas state law allows a converted ADU, a detached ADU, and a JADU on the same lot.

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

Frequently asked questions about ADU regulations in Santa Cruz

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

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

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

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

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

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

• Is ADU approval ministerial in Santa Cruz?

  In Santa Cruz, 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 Cruz planning can confirm the exact process.

• Are there parking requirements for ADUs in Santa Cruz?

  In Santa Cruz, 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 Santa Cruz planning for your address.