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20×24 Lean to Patio Cover Plans

20x24 Lean to Patio Cover Plans - PDF Download

by Ovidiu


This step by step diy project is about 20×24 lean to patio cover plans. This lean to has a 1.5:12 pitch and it can be both used as a carport or as a patio cover. I’ve designed this patio pergola so you get the most for your money. The simple design will match the style of any house, so you don’t have to worry about making significant modifications. Take a look over the rest of my woodworking plans, if you want to get more building inspiration.

You can extend the living space of the house by building a nice attached patio cover. This is a large project so you can really make the most by using it as a dining area or for playing games with the loved ones.

When buying the lumber, you should select the planks with great care, making sure they are straight and without any visible flaws (cracks, knots, twists, decay). Investing in cedar or other weather resistant lumber is a good idea, as it will pay off on the long run. Use a spirit level to plumb and align the components, before inserting the galvanized screws, otherwise the project won’t have a symmetrical look. If you have all the materials and tools required for the project, you could get the job done in about a day.



Projects made from these plans




20×24 Lean to Patio Cover – PDF Download




Cut & Shopping List


 Hammer, Tape measure, Framing square, Level

 Miter saw, Drill machinery, Screwdriver, Sander

 Concrete mixer, Post hole digger

 Safety Gloves, Safety Glasses


One week




Building an attached carport – 20×24 DIY Plans



First, you need to layout the posts for the patio cover. Use batter boards and string to mark the location for the posts. Dig 3 ft deep holes and 12″ in diameter. Set the concrete tubes and then fill them with concrete. Set the post anchors into place and line them one to another.



After the concrete sets, you have to attach the posts to the anchors. Plumb the posts with a spirit level and lock them into place with temporarily braces. Insert the lag screws to secure the posts to the anchors.

TIP: Remove the vegetation layer before starting the project. Read the local codes and make modifications, if necessarily.

Anchoring the posts of the anchor

Anchoring the posts of the anchor

You can set the posts in concrete or you can pour 3′ deep footings and use posts anchors. Considering this is a light outdoor project, you can set the posts to anchors. That is why, these plans are designed having that assumption in mind (concrete anchors).

Dig the holes and set the 14″ tube forms. Fill the tubes with concrete and set the post anchors. Make sure you let the concrete to dry out for a few day, before installing the posts into place. Use temporarily braces to secure the posts until you attach the plates.

Installing the posts

Installing the posts

Use a laser level / water level to make sure the top of the posts are at the same level.



We will be using 6×8 lumber for the top support beams. Make 1 3/4″ deep notches to the beams, as shown in the diagram. Use a circular saw and set the blade depth to 1 3/4″. Make parallel cuts inside the marked areas and remove the excess with a hammer and a chisel. Make a decorative cut to one end of the beams.



Fit the beams to the top of the posts. Align the edges flush, drill pilot holes and insert 10″ screws to lock them to the top of the posts.

Make sure the posts are vertical before attaching the top beams. Use a spirit level to check if the top beams are perfectly horizontal.



Use 6×6 lumber for the braces. These braces will enhance the rigidity of the structure. Cut the side braces as shown in the diagram.

Drill pilot holes and insert 5 1/2″ screws to lock them to the pavilion structure. Use 2 screws for each joint. Make 45 degree cuts to both ends of the braces.


Building the lean to roof



Plan the ledger board placement, ensuring it’s level, and mark attachment points on the ledger and corresponding wall studs. Pre-drill pilot holes in the ledger at marked points, then position and attach it to the wall using lag screws or bolts.

The lag screws should be long enough to penetrate through the ledger, any sheathing, and into the wall studs by at least 2.5 inches to 3 inches. Verify the ledger’s level, ensure stability by securely tightening fasteners, and consider applying waterproof sealant for added protection.



Use 2×12 lumber for the rafters. Mark the cut lines to the beams and get the job done with a saw, as shown in the plans.



Next, we need to attach the rafters to the top of the patio cover. Place the 2×12 rafters every 24″ on center. Use rafter hangers and 1 1/2″ structural screws to lock the rafters to the ledger boards.

Use rafter ties and 1 1/2″ structural screws to secure the rafters to the support beams.



Next, we have to attach the 3/4″ plywood sheets to the top of the pavilion. To attach plywood to the lean-to pavilion roof, start by laying the plywood panels perpendicular to the roof rafters.

Use 2 1/2-inch wood screws to secure the plywood to the trusses, placing screws approximately every 6 to 8 inches along the edges and every 12 inches in the field of the plywood.



Attach the 1×8 trims to the sides of the pavilion. Align the edges with the top edge of the roof sheets. Insert 2″ nails to lock the trims to the frame of the pavilion.



Next, attach the trims to the front of the pavilion, as well. Align the edges flush and insert 2″ nails to lock them into place tightly.



To install asphalt shingles to the new lean-to pavilion roof, begin by laying an asphalt underlayment over the plywood sheathing, ensuring complete coverage and proper overlapping. Start at the lower edge with a starter strip, securing it with roofing nails.

Lay the first row of shingles along the eaves, aligning the tabs with the starter strip and nailing them down. Continue installing subsequent rows, staggering shingle joints and following the manufacturer’s guidelines for overlap and fastening.



See the full dimensions for the patio cover in the diagram.



Enhance the aesthetic appeal with a weather-resistant stain or paint to protect the wood and add a polished look. Finally, consider incorporating comfortable outdoor furniture and lighting fixtures to create a welcoming and functional space for relaxation and gatherings.



This project can be built in less than one week and it can also be used as a patio cover. I recommend you to read the local building codes before starting the project, so you make sure you comply with the local building codes.

If you build this carport attached to the double garage, you will have a nice shaded area that will be perfect for a car or for woodworking outside. If you want to get the Premium Plans, see the GET PDF PLANS button bellow.



This woodworking project was about 20×24 attached patio cover plans. If you want to see more outdoor plans, check out the rest of our step by step projects and follow the instructions to obtain a professional result.




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