ADU Regulations in Garden Grove, California (2026)

Regulations at a glance

Local rules & notes

Unusual Minimum Size Requirements: The ordinance sets 'minimum sizes' for ADUs (e.g., 500 sq ft for studios, 600 sq ft for 1-bed), which is highly unusual as codes typically only set maximums. However, it provides an exception for efficiency units. Strict Enclosed Parking Mandate: Unlike most jurisdictions that allow uncovered parking or tandem parking on driveways, this ordinance requires 'enclosed' off-street parking spaces for ADUs (except for the second space of a 2-bed unit). Total Footprint Cap: There is a secondary cap on the total aggregate area of the ADU plus any attached features like porches or garages, limiting the total structure to 1,100 sq ft.

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

Frequently asked questions about ADU regulations in Garden Grove

• What is the maximum ADU size in Garden Grove, California?

  In Garden Grove, the maximum ADU size is typically 800 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; Garden Grove may follow state defaults or have local limits. Verify with Garden Grove planning for your specific lot.

• What are the setback requirements for ADUs in Garden Grove?

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

• What is the maximum height for an ADU in Garden Grove?

  In Garden Grove, the maximum height for an ADU is generally 17 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 Garden Grove or county planning for your zone.

• Is ADU approval ministerial in Garden Grove?

  In Garden Grove, 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; Garden Grove planning can confirm the exact process.

• Are there parking requirements for ADUs in Garden Grove?

  In Garden Grove, 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 Garden Grove planning for your address.