ADU Regulations in Atascadero, California (2026)

Regulations at a glance

Local rules & notes

Illegal Front Setback Requirement: The City requires a 25-foot front setback for single-family properties and 15-foot for multifamily, which HCD states violates the ban on front setbacks that preclude an 800 sqft unit. Illegal Fire Sprinkler Retrofit: The City requires sprinklers in the primary dwelling if triggered by ADU construction; HCD clarifies ADUs cannot trigger primary dwelling sprinkler retrofits. Multifamily Density Gatekeeping: The City attempts to prohibit ADUs on multifamily lots that have not yet met maximum density through primary units. HCD declares this illegal. Deed Restriction Mandate: The City requires deed restrictions for ADUs, which HCD identifies as an unallowable 'additional standard' that must be removed.

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

Frequently asked questions about ADU regulations in Atascadero

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

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

• What are the setback requirements for ADUs in Atascadero?

  In Atascadero, typical setback requirements are 10 feet from the side property line and 10 feet from the rear. These may be reduced to 4 feet under California Government Code § 65852.2 where applicable. Check with Atascadero planning for overlay zones or design standards that could affect your site.

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

  In Atascadero, 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 Atascadero or county planning for your zone.

• Is ADU approval ministerial in Atascadero?

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

• Are there parking requirements for ADUs in Atascadero?

  In Atascadero, 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 Atascadero planning for your address.