ADU Regulations in Fillmore, California (2026)

Regulations at a glance

Local rules & notes

Geographic Prohibition (Northwest Fillmore): ADUs are explicitly prohibited in the northwest portion of the City due to infrastructure deficiencies. High Development Impact Fees: The Housing Element lists substantial impact fees applicable to Second Units, including a Sewer Improvements Fee of $12,377.

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

Frequently asked questions about ADU regulations in Fillmore

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

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

• What are the setback requirements for ADUs in Fillmore?

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

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

  In Fillmore, 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 Fillmore or county planning for your zone.

• Is ADU approval ministerial in Fillmore?

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

• Are there parking requirements for ADUs in Fillmore?

  In Fillmore, 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 Fillmore planning for your address.