How to Attach a Carport

An attached carport or lean-to adds a degree of protection to vehicles and equipment and is easy enough to construct by do-it-yourselfers with adequate tools and materials. The carport can be attached to either a garage, shed or your house, provided the existing eave is high enough. Except in extreme weather, the attached lean-to can provide a modicum of shelter for a number of items, including a car, boat, garden tractor or all-terrain vehicle.

Things You'll Need

  • Beams, 4 by 4 inches by 12 feet
  • Joist hangers
  • Boards, 2 by 6 inches by 14 feet.
  • 16d nails
  • 1/2-inch exterior plywood
  • Shingles
  • Saw


    • 1

      Cut six 4-by-4-inch to accommodate the designed height of your carport, adding approximately 3 feet to allow for embedding the posts in the foundation. Cement in the posts to secure them and provide more stability. These posts will support the roof of the carport.

    • 2

      Place four of the posts evenly spaced 12 feet out from the building. Place the remaining two posts directly next to the building at the opposite corners, forming a rectangle. These two posts serve as attachment to the existing building.

    • 3

      Cut 2-by-6 inch boards to a length of 13 feet for the framework of the roof, including the rafters. Fasten the front support beam to the outside posts using 16d nails. Fasten rafters to the front support beam across the length of the roof spaced 16 inches apart. Fasten rafters to the existing building using joist hangers.

    • 4

      Cover with 1/2 inch exterior grade plywood and shingle.

Tips & Warnings

  • The eaves of the existing building will extend over the roof of the carport by approximately 1 foot.
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