ADU Regulations in Placentia, California (2026)

Regulations at a glance

Local rules & notes

Pre-approved ADU Plans: The City will prepare pre-approved plans to assist homeowners and reduce design costs. Enhanced Fee Reductions: The City plans to reduce fees beyond the minimum requirements of State law to encourage ADU production. ADU Toolkit Utilization: Placentia will utilize the Orange County Council of Governments (OCCOG) ADU Toolkit to provide standard plan examples and resources.

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

Frequently asked questions about ADU regulations in Placentia

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

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

• What are the setback requirements for ADUs in Placentia?

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

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

  In Placentia, 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 Placentia or county planning for your zone.

• Is ADU approval ministerial in Placentia?

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

• Are there parking requirements for ADUs in Placentia?

  In Placentia, 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 Placentia planning for your address.