ADU Regulations in Laguna Hills, California (2026)

Regulations at a glance

Local rules & notes

Ordinance Null and Void: HCD states that if the local ordinance does not comply with current state law, it is void, and state standards apply directly. HOA Restrictions Invalid: Homeowners' Associations cannot influence or prohibit ADU applications; third-party review by HOAs violates state law. Amnesty for Unpermitted ADUs: The city cannot deny permits for unpermitted ADUs built before 2020 unless there is a specific health/safety violation. Deemed Approved Mechanism: Applications are automatically approved if the agency does not act within 60 days.

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

Frequently asked questions about ADU regulations in Laguna Hills

• What is the maximum ADU size in Laguna Hills, California?

  In Laguna Hills, the maximum ADU size is typically 850 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; Laguna Hills may follow state defaults or have local limits. Verify with Laguna Hills planning for your specific lot.

• What are the setback requirements for ADUs in Laguna Hills?

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

• What is the maximum height for an ADU in Laguna Hills?

  In Laguna Hills, 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 Laguna Hills or county planning for your zone.

• Is ADU approval ministerial in Laguna Hills?

  In Laguna Hills, 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; Laguna Hills planning can confirm the exact process.

• Are there parking requirements for ADUs in Laguna Hills?

  In Laguna Hills, 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 Laguna Hills planning for your address.