As of July 2015, BuildEazy and PlanSource Inc. are good online resources for free garage plans. Both websites offer downloadable plans in PDF format. Builders using these plans are responsible for obtaining local building permits.
BuildEazy provides plans for a single-car garage designed for a limited budget. As such, the plans do not call for a concrete slab or any kind of flooring. The garage has plywood siding and a corrugated iron roof.
PlanSource Inc. provides plans for a detached two-car garage that rests on a concrete slab. The walls consist of drywall, insulation and lap siding, while the roof consists of asphalt shingles over plywood sheathing.