This step by step diy woodworking project is about 12x24 attached carport plans. I had many requests for a large 12x24 carport with a lean roof. This carport features a sturdy 6x6 framing and a roof with a 3:12 slope. The roof structure is built on a sturdy 2x10 rafter structure, every 24". This is a wooden carport that is easy to build an budget friendly.