ADU Regulations in Eureka, California (2026)

Regulations at a glance

Local rules & notes

ADU Ambassador Program: A unique program where the City trains local lenders (banks, credit unions) to serve as 'ADU Ambassadors' to help homeowners navigate financing for ADU construction. Public Improvements Required (PIR) Trigger: Building permits with a value over $11,000 trigger a requirement to bring public infrastructure (sidewalks, curbs) up to code, which can make low-cost ADU conversions financially unviable. The City is reviewing this. Affordable-by-Design Incentives: Units smaller than 500 square feet are classified as 'Affordable-by-design' and are explicitly exempt from providing dedicated off-street parking spaces. Small Lot Subdivisions vs ADUs: The City promotes Small Lot Subdivisions as an alternative to ADUs for backyards, allowing the new unit to be sold separately, which ADUs cannot be.

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

Frequently asked questions about ADU regulations in Eureka

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

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

• What are the setback requirements for ADUs in Eureka?

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

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

  In Eureka, 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 Eureka or county planning for your zone.

• Is ADU approval ministerial in Eureka?

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

• Are there parking requirements for ADUs in Eureka?

  In Eureka, parking for ADUs is generally Often waived per state law; check local ordinance. California law often waives parking for ADUs within a half-mile of transit or in certain historic districts. Check with Eureka planning for your address.