ADU Regulations in Folsom, California (2026)

Regulations at a glance

Local rules & notes

Discretionary Review for Height > 16ft: Unlike many jurisdictions that allow 16-25ft ministerially, Folsom requires Community Development Director or Historic District Commission review for any ADU taller than 16 feet. Historic District Architectural Styles: The ordinance mandates specific architectural styles (Craftsman, Queen Anne, Delta, etc.) for ADUs in the Historic District to match the zone/subarea. Privacy Standards for Two-Story Units: Specific design requirements for second-story walls facing abutting properties, including translucent or high windows.

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

Frequently asked questions about ADU regulations in Folsom

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

  In Folsom, the maximum ADU size is typically 1000 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; Folsom may follow state defaults or have local limits. Verify with Folsom planning for your specific lot.

• What are the setback requirements for ADUs in Folsom?

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

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

  In Folsom, 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 Folsom or county planning for your zone.

• Is ADU approval ministerial in Folsom?

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

• Are there parking requirements for ADUs in Folsom?

  In Folsom, parking for ADUs is generally 1. California law often waives parking for ADUs within a half-mile of transit or in certain historic districts. Check with Folsom planning for your address.