ADU Regulations in Newport Beach, California (2026)

Regulations at a glance

Local rules & notes

Unit Combination Allowance: Homeowners can combine a converted ADU, a detached new construction ADU, and a JADU on a single-family lot. Non-conforming Zoning Amnesty: The city cannot require the correction of existing non-conforming zoning conditions or unpermitted structures as a condition for ADU approval. JADU Minimum Size Flexibility: JADUs are not strictly bound by 'efficiency unit' minimums but rather by basic building code room size requirements.

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

Frequently asked questions about ADU regulations in Newport Beach

• What is the maximum ADU size in Newport Beach, California?

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

• What are the setback requirements for ADUs in Newport Beach?

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

• What is the maximum height for an ADU in Newport Beach?

  In Newport Beach, the maximum height for an ADU is generally 25 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 Newport Beach or county planning for your zone.

• Is ADU approval ministerial in Newport Beach?

  In Newport Beach, 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; Newport Beach planning can confirm the exact process.

• Are there parking requirements for ADUs in Newport Beach?

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