This step by step diy project is about how to build a lean to carport. Building a simple carport is a straight forward projects, if you plan everything from the very beginning and use the right carpentry techniques. A lean to construction is ideal for narrow backyards, as well as for woodworking novices, as it doesn’t require an extensive expertise in carpentry. Moreover, you only need basic tools, to get the job done.
Before starting the actual construction of the lean to carport, you need to study the local building codes thoroughly. The legal requirements vary extensively according to the area where you live, so you should read them a few times. In most of the cases, the construction require a building permit, so you need to be aware of the required depth of the footings, or the materials you are allowed to use.
Align the wooden components at both ends, before driving in the screws. Drill pilot holes trough the components to prevent the wood from splitting. Check the corners for squareness, every time you install a component. Check if the posts are plumb and if the support beams are horizontal, before locking them into place with screws or bolts. A lean-to construction will be easier to build as compared to a gable roof carport .The roof will direct the water in only one direction, so you could build it close to the property line.
Building a lean to carport plans
- A – 6 pieces of adjustable metal anchors, tube forms, cement, shap sand, gravel FOOTINGS
- B – 2 pieces of 4×4 lumber – 96” long, 2 pieces of 4×4 lumber – 127 1/4” long POSTS
- C – 2 pieces of 2×6 lumber – 120” long RIM RAFERS
- D – 8 pieces of 2×4 lumber – 26” long BRACES
- E – 12 pieces of 2×6 lumber – 124 1/4” long – both ends cut at 15º RAFTERS
- F – 8 piece of 3/4” tongue and groove plywood ROOFING
- G – 120 sq ft of tar paper ROOFING FELT
- H – 120 sq ft of asphalt shingles SHINGLES
- Safety gloves, glasses
- Miter saw, jigsaw
- Chalk line, tape measure, spirit level, carpentry pencil
- Drill machinery and drill bits
- Pre-drill holes in the wooden components, before driving in the screws
- Check the corners for squareness, using a corner square
- One weekend
How to build a lean to carport
The first step of the project is to lay out the carport in a professional manner. In order to get an accurate result, you need to use batter boards and string, as in the image. Check the corners for squareness, by applying the well-known 3-4-5 rule to every corner.
Afterwards, you have to set the posts into place. As you can see in the image, you have several options: set the posts into concrete, pour concrete footing and attach adjustable anchors or setting the supports to a slab.
Setting the posts in concrete is essential for the rigidity of the carport. As you can easily notice in the diagram, we recommend you to dig 3′ deep holes and to pour 2″ gravel on the bottom. Install the tube forms to the holes. Secure the posts with braces before filling the forms with concrete, making sure the posts are level.
Fitting the posts into place should be a straight forward task, as you just need to secure them with lag screws to the metal anchors. Use a good circular saw to cut the posts at the right size, making the ends are right-angled.
Afterwards, you need to attach the support beams to the wooden posts, as in the plans. In order to get the job done in a professional manner, you need to align the 2×6 beams at both ends (the supports should overhang 1 1/2” on both ends). In addition, check if the supports are level, before clamping them to the wooden posts. Drill pilot holes trough the beams and posts, before driving in the 5 1/2” carriage bolts.
As you can see in the image, the crossbeams should overhang about 1 1/2” at both ends. In addition, the top ridge should be installed 1 1/4” higher as compared to the posts, otherwise you won’t be able to secure the roofing sheets properly.
If you live in a windy area, or you have secured the posts with posts anchors rather than setting them in concrete, you should increase the rigidity of the structure with wooden braces. As you can see in the image, you have to cut both ends of the braces at 45º and lock them into place with screws.
Drill pilot holes trough the braces and insert the 2 1/2” screws, to prevent the wood from splitting. Make sure the braces are aligned properly, before inserting the screws.
The next step of the woodworking project is to build the rafters and to fit them into place. In order to drain the water properly, the roof should have a slope of at least 15º. Therefore, cut both ends of the rafters at 15º, using a circular saw with a sharp blade.
In order to lock the rafters tightly to the crossbeams, you have several alternatives. On one hand, you could drill pilot holes trough the breams and insert 3” screws from the outside of the lean-to carport.
On the other hand, you could use corner framing hardware to anchor the rafters to the rim beams. Use 1 1 /2 screws to secure the rafters into place tightly. Ask a friend to hold the rafters, while driving in the screws.
After installing the rafters into place, you need to fit the roofing sheets. If you want to get the job done properly and to get a durable result, we recommend you to use 3/4” tongue and groove plywood sheets and to la them as in the plans.
Cover the roof with felt, making sure the strips overlap at least 2”. Use staples to secure the tar paper to the 3/4” plywood. Fit the back and front drip edge over the roofing felt, while the side drip edges should be installed under the felt.
Install the shingles starting with the bottom of the roof. First, install the starting course with the tabs upward-oriented. Continue the installation by fitting the tabs and securing them into place with staples.
Last but not least, you should take care of the final touches. Therefore, you could install lattice panels between the posts and use them as privacy screens. In addition, you need to fill the holes with wood putty and to let it dry out for several hours, before sanding the components.
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