20×24 Double-Car Carport

About This Design

This 20×24 double carport adds real depth behind the vehicles — enough for a workbench, bikes, or yard equipment along the back wall line, even though there is no wall there at all. Posts, beams, and a solid shingled roof carry the same ADR 027 post-and-beam engineering as the rest of the catalog, just scaled for the deeper bay.

A poured pad is the only foundation this plan needs; there is no garage structure to frame around it.

Key Features

• 20×24 solid shingled roof on 8×8 posts
• Open-sided freestanding structure — no walls to frame
• Knee-braced 8×8 posts on standoff post bases — the same lateral detail as our pergolas
• Full cut list and materials BOM through the same framing engine as every plan

Build Notes

Set the posts on standoff post bases anchored to piers or the slab, run the beams and rafters per the framing drawings, then bolt a knee brace at every post-to-beam joint before sheathing and shingling the roof deck. The braces are the lateral load path — do not omit them; the engineering notes below give the through-bolts each brace end needs at the design wind.

The BOM covers posts, beams, rafters, roof sheathing, shingles, and hardware. Concrete for the pad is priced separately or supplied by others.

Best For

Right-sized for covered parking without the cost of a garage. Want an open-lattice shade structure instead of a solid roof? See our pergola plans.

Engineering Notes

The framing engine checks this carport's posts, knee braces, footings and roof uplift at 115 mph, Exposure B — the ASCE 7 basic wind speed across most of the interior United States. It is not a stamped design: a higher wind zone, an open or coastal site, or a jurisdiction that asks for sealed drawings needs a local engineer to review it.

• Knee-brace force 2091 lb on the 6 width braces (transverse wind) at 115 mph Exp B — use 2 × 5/8" through-bolts at each brace end in one row along the brace, 2.5″ apart, 4.375″ from the brace end (2101 lb, single shear, wet-service wind).