ADU Regulations in Ukiah, California (2026)

Regulations at a glance

Local rules & notes

Illegal Off-site Improvement Requirements: The city attempted to mandate curb, gutter, and sidewalk improvements for ADU projects where the permit value exceeded 1/3 of the primary structure's value. HCD identified this as an unauthorized standard. Expanded Multifamily ADU Capacity: Following SB 1211, the city must allow up to 8 detached ADUs on multifamily lots, provided the number does not exceed the count of existing units on the lot. Uncovered Parking Replacement Waiver: The city must allow for the demolition or conversion of uncovered parking spaces without requiring replacement off-street parking.

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

Frequently asked questions about ADU regulations in Ukiah

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

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

• What are the setback requirements for ADUs in Ukiah?

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

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

  In Ukiah, 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 Ukiah or county planning for your zone.

• Is ADU approval ministerial in Ukiah?

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

• Are there parking requirements for ADUs in Ukiah?

  In Ukiah, 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 Ukiah planning for your address.