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12x20 garage plans: design your own 12' x 20' garage

A 12 by 20 foot detached garage is 240 square feet (about 22.3 m²). It is a compact one-door size for a single vehicle, a workshop or storage. At 12 feet wide there is room for one overhead door across the front.

Open Garage Planner at 12' x 20' →

What you can do in Garage Planner

• Start at 12' wide by 20' deep, then change the size in 2-foot steps if you need to.
• Place overhead doors, a walk-in door and windows on any wall.
• Choose a single-story garage or a gambrel loft, and pick siding and roof pitch.
• Print a scaled draft drawing (floor plan, elevations and more) to take to your city.

Permits

At 240 sq ft (about 22.3 m²), this garage is larger than the 10 m² (about 108 ft²) size above which Barrie, Ottawa and Waterloo say a detached garage needs a building permit. See the city guides: Barrie, Ottawa, Waterloo. Other cities have their own rules, so check with yours.