ADU Regulations in Santee, California (2026)

Regulations at a glance

Local rules & notes

Multifamily Detached ADU Size Limit Removal: HCD clarified that detached ADUs on multifamily lots are reviewed under Gov Code 66323(a)(4), which does not include size restrictions, meaning the city cannot cap them at 1,200 sq ft. Fire Sprinkler Requirement Prohibition: The city attempted to require fire sprinklers for attached ADUs in multifamily structures, but HCD ruled this inconsistent with state law if the primary residence lacks them. Setback vs Fire Separation Distinction: The city incorrectly used fire separation distances to increase zoning setbacks; HCD mandated that setbacks remain at 4 feet or less regardless of fire official discretion outside hazard zones.

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

Frequently asked questions about ADU regulations in Santee

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

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

• What are the setback requirements for ADUs in Santee?

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

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

  In Santee, 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 Santee or county planning for your zone.

• Is ADU approval ministerial in Santee?

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

• Are there parking requirements for ADUs in Santee?

  In Santee, 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 Santee planning for your address.