Sheds, garages and other accessory structures in Antioch

Each rule below links to the section of the Antioch Municipal Code it was read from, with the code text one click away (checked October 2026). General information, not legal advice.

What Antioch's code says

Antioch code What Antioch's code adds
Maximum height	No more than 15 feet tall. Applies: Accessory structures in residential districts. § 9-5.603 · code text In residential districts, the maximum allowable height is 15 feet for accessory structures.
Size or lot coverage	No more than 40% of the rear yard area required for the house. Applies: Detached accessory structures in residential districts. § 9-5.603 · code text Detached accessory structures shall be located behind the required front yard setback and cover no more than 40% of the rear yard area required for the main building.
Side and rear setback	At least 20 feet from the side lot line. Applies: Side yard on corner lots. § 9-5.603 · code text The minimum side yard for accessory structures is 20 feet on corner lots and five feet on interior lots. At least 5 feet from the side lot line. Applies: Side yard on interior lots. § 9-5.603 · code text The minimum side yard for accessory structures is 20 feet on corner lots and five feet on interior lots. At least 5 feet from the rear lot line. Applies: Rear yard, unless the property is a double-frontage lot. § 9-5.603 · code text A five-foot rear yard setback is required, unless the property is a double-frontage lot in which case a ten foot rear yard setback is required. At least 10 feet from the rear lot line. Applies: Rear yard on a double-frontage lot. § 9-5.603 · code text A five-foot rear yard setback is required, unless the property is a double-frontage lot in which case a ten foot rear yard setback is required. Portable storage sheds in the rear yard do not need setbacks. Applies: Movable, no permanent foundation, under 120 square feet, at most 8 feet tall, no plumbing or electrical; front and street side setbacks still apply. § 9-5.603 · code text Portable storage sheds are exempt from setback requirements when placed in the rear yard.
Distance from the house	At least 5 feet from any home on the same lot or a neighboring lot. Applies: Accessory buildings in a residential district that are not attached to the house. § 9-5.603 · code text Unless so attached, an accessory building in a residential district shall be at least five feet from any dwelling building existing or under construction on the same lot or any adjacent lot.

Who this affects

HomeownersContractorsDesigners

Frequently asked questions

How big can a shed or accessory building be in Antioch?

Antioch limits accessory structures in residential districts to 15 feet, and detached ones to 40% of the main building's required rear yard.

Sheds, garages and other accessory structures in Antioch

Key points

What Antioch's code says

Who this affects

Frequently asked questions

Ask about a specific Antioch property

More on building on your lot in Antioch