People ask whether they need a single or a double metal carport, and the honest answer is that it is rarely about the number of vehicles. It is about the space around them.
A single carport is sized for one vehicle. A double is wide enough for two side by side. That sounds simple, but the width you need depends on how you get in and out, what the weather does, and what else you want under that roof.
The thing most buyers don't know
A carport that is exactly as wide as your vehicle is too narrow. You need room to open the doors, carry groceries and unload kids without squeezing between a truck and a post. A pickup with the doors open takes up a lot more room than the truck closed.
For a single, that usually means choosing the next width up from what you think you need. For a double, the gap between two vehicles matters. Park two pickups side by side with no gap and nobody can open a door on the inside.
When a single makes sense
A single works when you have one daily vehicle, a tight lot, or a spot beside the house where there isn't room for more. In older neighborhoods in Bend, Redmond or Boise, lots are often narrow and the driveway is already squeezed. A single, placed carefully, covers the vehicle and leaves the yard alone.
Check setbacks with your city or county before you decide.
When a double is worth it
A double covers two vehicles, and it also gives you room for the things that end up around them: a mower, bikes, firewood, a workbench along one side. If you have ever looked at a single and thought "where does everything else go," go with the double.
In snow country, a wider structure also lets you unload under cover instead of on a snowy driveway. Around Sisters and up toward the passes, that matters from November to March.
Length matters as much as width
People spend a lot of time on width and forget length. A full-size truck with a rack, or a trailer hitched behind, needs more length than a car. Measure bumper to bumper, then add room at both ends.
An RV is a different category. If it is tall or long enough for an RV or trailer, you want an RV cover, with more height and a different frame. Don't squeeze an RV under a carport sized for a truck.
Roof and sides
Most carports are built with an A-frame vertical roof, where the panels run from ridge to eave. That sheds snow and pine needles, which matters in Central Oregon and across the Cascades. They usually have gables on the ends and one short side panel on each side, about 3 feet down from the eaves, for shear strength. That side panel does not make it enclosed.
If you want more protection, you can add options: full sidewalls on one or both sides, endwalls, or extra side panels. That makes it a partially enclosed carport. The photo above shows a wide A-frame metal carport with one full sidewall and a short side panel. The sidewall blocks the weather that usually blows in from one direction.
Wind and snow
A wider carport has more roof area, which means more snow sitting on it. That is why certification matters. Certified carports are rated for 40, 50, 60 or 80 psf snow load, and for wind. Snow load depends on the exact address, so don't go by what a neighbor in another town was told. Call your county building department and ask what your address needs.
In places like the Columbia Gorge, the Palouse or the Snake River plain in Idaho, wind is the bigger question. The right anchors for your ground make a real difference, and a wider carport catches more wind than a narrow one.
How I would decide
- Park a vehicle, open all the doors, and measure how much room you used. That is your width.
- Count what else you want under the roof. That adds to the size.
- Check setbacks and HOA rules before ordering.
- Ask what snow load and wind your address needs.
- If you are on the edge between a single and a double, go bigger. You can't add width later without a new structure.
If you are in the Sisters area, the snow question is a big one, and it is worth settling before you pick a size. A carport is a simple building, but the decisions that make it work are about space, weather and how you live. Spend the time up front and it will serve you for decades.