ADU Regulations in Pomona, California (2026)

Regulations at a glance

Local rules & notes

Pre-Approved ADU Plan Program: Local agencies must develop a program for pre-approval of ADU plans by January 1, 2025, and must approve/deny applications using these plans within 30 days. Unpermitted ADU Amnesty: Local agencies are precluded from denying a permit for an unpermitted ADU constructed before January 1, 2020, unless it is a health and safety risk. Demolition Permit Synchronization: Local agencies must issue a demolition permit for a garage being replaced by an ADU at the same time as the ADU permit.

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

Frequently asked questions about ADU regulations in Pomona

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

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

• What are the setback requirements for ADUs in Pomona?

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

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

  In Pomona, 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 Pomona or county planning for your zone.

• Is ADU approval ministerial in Pomona?

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

• Are there parking requirements for ADUs in Pomona?

  In Pomona, 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 Pomona planning for your address.