How to Expand Your Old Carport

What You'll Need
Basic Construction Tools
Lag Bolts
Concrete Mixture
Joist Hangers
Metal Angle Brackets
H Brackets
Zip Ties

If you’ve come to decide that your carport isn’t as big as you’d like or need, there are methods you can go with to expand the size of your carport. This is most easily done with wooden carports, though there are some things you can do with metal and portable carports.

Step 1 – Remove Roof and Sides

For wooden carports, the first thing you’re going to want to do is remove the roof, as well as any sides over which you are planning to expand. Take care with the roof, as you’ll probably still be using it later, but for now it is simpler to have it off.

Step 2 – Expand Base

A solid base is important for carport building. If you have a particular base that your carport is currently on, such as a concrete slab, you will have to replicate this for the extension. Build yourself a retaining wall to match the height of your current slab, making sure to measure it far enough to account for the full addition of your carport. Mix and pour your concrete into the retaining wall and let it sit at least over night to dry.

Step 3 – Uprights and Supports

For the rest, you are more or less replicating what is already in your current carport. Set up posts exactly as the old ones are, and add supports between the new posts and the old ones. If you are making a small extension, you could probably get away with moving the current supports out a couple feet, (use boards stood on end to support the structure during the move), but it is best for the heavy roof if you leave them be and simply add more.

Once your posts are in place and attached to one another, be sure to add any additional supports and rafters comparable to what you already have. For the rafters, you’ll probably need joist hangers to attach them between beams.

Step 4 – Roof Trusses and Frame

It is very important here that you take careful note of how the original roof was constructed, as roofs are tricky things to build. You’ll definitely want to use heavy duty metal brackets to support all your connections here. Start with the trusses on the end, then add any necessary supports.

Step 5 – Closing It Up

Add plywood panels to the top to close it all up, connecting them to each other with H brackets. Once it is completely closed up, feel free to add roofing felt and shingles as you like.

Step 6 – Other Carport Types

For portable carports, you have two options; you can either set up two carports side by side, using cord, zip ties, or some other material to lash them together, or (depending on how yours is built) you can attach them end to end, and simply buy a canopy large enough to cover both at once.

For metal carports, you also have two options. The first is essentially the same as the portable carport, where you set them up side by side and lash them together somehow. However, a better fix is to set them up side by side and then, using roofing sections slightly longer than what they originally come with, overlap the roofs and bolt them together. You can also simply buy one large roofing section to bolt over both.

For more expansion ideas, consider contacting the manufacturer about other carport models offered.