The best carports are sized at least 2–3 feet wider and 3–4 feet longer than the vehicle they protect, with a frame and anchoring system matched to your local wind, snow, ground, and permission requirements.
As an Amazon Associate we earn from qualifying purchases at no extra cost to you.
Our Top Picks
Top 3 picks at a glance
Start With the Vehicle, Not the Advertised Carport Size
Carport dimensions usually describe the outside frame, not the amount of unobstructed space between posts. A “20-foot” unit may provide less usable length after accounting for braces, end rails, and clearance at the entrance. Measure the vehicle with mirrors folded and unfolded, then add room for doors, walking, and loading.
| Vehicle or use | Minimum practical inside width | Recommended length | Typical height requirement |
|---|---|---|---|
| Compact car | 10–12 ft | 18–20 ft | 7–8 ft |
| Large sedan or crossover | 12–14 ft | 20–22 ft | 8–9 ft |
| Full-size pickup or SUV | 14–16 ft | 24–26 ft | 9–10 ft |
| Two vehicles | 20–24 ft | 20–26 ft | 8–10 ft |
| RV, camper, or box trailer | 14–18 ft | 30–40 ft | 12–14 ft or more |
For a worked example, suppose a pickup is 19 feet 4 inches long and 6 feet 8 inches wide with its mirrors extended. Adding 3 feet of length at the front and 3 feet at the rear requires roughly 25 feet of usable length. Adding 3 feet on each side requires about 12 feet 8 inches of usable width. Since the frame consumes some of that space, a 14-by-26-foot carport is a safer choice than a nominal 12-by-24-foot model.
Best Carports by Vehicle and Yard
| Your situation | Best starting configuration | Why it fits |
|---|---|---|
| Small car on a paved driveway | 12 × 20 ft, low or regular roof, steel frame | Efficient footprint with enough door clearance |
| One SUV or pickup | 14 × 24 or 14 × 26 ft, regular or boxed-eave roof | More side clearance and useful front-to-back margin |
| Two cars on a wide lot | 20 × 20 or 24 × 24 ft, reinforced steel frame | Allows two doors to open without crowding |
| RV or tall trailer | 18 × 36 ft or larger, vertical-roof design | Extra height and drainage reduce clearance problems |
| Narrow side yard | Single-slope or compact gable design, custom-width frame | Fits the property while directing water away from walls |
| Snowy or high-wind region | Engineered steel frame with a rated roof and permanent anchoring | Load ratings and anchoring matter more than fabric thickness |
Frame Materials: Steel Usually Wins, but Design Matters
Galvanized steel
Galvanized steel is the default choice for a permanent or semi-permanent carport. Zinc coating helps resist corrosion, while steel tubing provides better stiffness than many lightweight alternatives. Look for structural tubing with continuous bracing, corrosion-resistant fasteners, and a frame engineered for the intended width and roof load.
Not all steel frames are equivalent. A wider carport creates greater forces at the roof and posts, so a 24-foot-wide structure needs more substantial members and bracing than a narrow single-car shelter. A very light frame may be adequate for temporary shade in calm conditions but unsuitable for exposed locations or heavy snow.
Aluminum
Aluminum frames are lighter and naturally corrosion-resistant, which can help near saltwater. They are also easier to handle during assembly. However, aluminum generally has less stiffness than steel at comparable sizes, so the design, connections, and anchoring deserve close attention. Choose it when low weight and corrosion resistance are priorities, not simply because the material sounds maintenance-free.
Wood
A wood carport can match a house and provide a rigid, attractive structure, but it requires proper footings, weather protection, roof detailing, and ongoing maintenance. It is better treated as a small building project than as a quick kit. Wood is often the most practical choice when you need custom dimensions, enclosed storage, or a structure that must integrate with an existing roofline.
Cover Materials: Fabric, Metal, and Polycarbonate
Polyethylene fabric
Woven polyethylene covers are affordable, lightweight, and easy to replace. They work well for seasonal protection from sun, rain, and light snow. The weak points are ultraviolet aging, abrasion at contact points, and wind uplift. A thicker cover alone does not make a temporary frame safe in severe weather; the frame, perimeter tension, and anchors determine whether the shelter stays in place.
Vinyl-coated fabric
Vinyl-coated polyester is heavier and usually more resistant to tearing and UV exposure than basic polyethylene. It is a reasonable middle ground for a fabric shelter that will remain installed for several seasons. Confirm that the cover is tensioned correctly, because loose material can flap, chafe, collect water, and transfer shock loads to the frame.
Corrugated steel or aluminum roofing
Metal roofing provides durable overhead protection and sheds sunlight better than thin fabric. It also makes a carport feel more permanent. The trade-offs are higher weight, more complex installation, possible condensation, and the need for a frame designed for the roof panels. In snowy areas, metal roofing can shed snow suddenly, so do not place the structure where falling snow can block a path or hit a door.
Polycarbonate panels
Polycarbonate is useful when you want daylight under the shelter and less heat than some opaque roofing. It is lighter than many metal systems but still requires correct purlin spacing, edge restraint, and allowance for thermal expansion. It is a good option for patios and light vehicle shelters, but the manufacturer’s wind and snow limits remain decisive.
Roof Shape and Weather Performance
A regular or rounded roof is economical and sheds rain reasonably well. A boxed-eave roof adds a more finished appearance and often improves water control around the edges. A vertical-roof design places seams and panels in the direction water and snow move, reducing the chance that horizontal seams become collection points. For heavy precipitation, vertical roofing is usually the strongest starting point, provided the frame has an appropriate load rating.
Snow load is not determined by roof appearance alone. Wet snow can weigh several times more than dry powder, and drifting can concentrate snow on one side. In a snow region, check the structure’s published ground or roof snow-load rating and compare it with local building requirements. Do not assume that removing the side panels makes a shelter safe during a storm; the roof still creates uplift and downward loads.
Anchoring: The Difference Between a Shelter and a Hazard
Anchoring must match both the surface and the weather exposure. Concrete anchors can provide a strong connection when installed at the specified embedment and edge distance. Asphalt anchors are different: asphalt may deform or pull out, so systems designed specifically for asphalt or a new concrete pad may be more reliable. On compacted soil, screw anchors or ground stakes need sufficient length and must be installed into suitable ground, not loose fill.
- Concrete: use expansion or wedge anchors only where the slab thickness and edge distances meet the instructions.
- Asphalt: use an asphalt-rated anchoring method; ordinary concrete fasteners will not solve a weak base.
- Soil: use helical or screw anchors sized for the structure and local wind exposure.
- Cold climates: account for frost movement and avoid shallow footings where local practice requires deeper foundations.
- Exposed lots: add bracing and anchors at the corners and intermediate posts if the engineering instructions call for them.
Anchors should be installed before the cover is fully tensioned, then checked again after the first significant wind or rain. A carport beside an open field, hill, shoreline, or broad driveway may experience stronger gusts than a shelter surrounded by buildings and trees.
Assembly and Site Requirements
Fabric kits can often be assembled by two or more people, but large structures are not automatically simple. A 20-by-30-foot frame has long components, many connections, and a large cover that can act like a sail. Plan for a level site, several hours or more of work, safe ladders, and a calm-weather installation window. Do not lift or spread a large cover in strong wind.
Before buying, verify the required clearance from property lines, easements, utilities, septic systems, and neighboring structures. Local rules may require a permit, engineered drawings, snow-load documentation, or a permanent foundation. A carport attached to a house often faces different requirements from a freestanding shelter.
How to Choose Among the Best Carports
- Measure the vehicle and the site. Include mirrors, roof accessories, doors, walking paths, and the turning approach.
- Choose usable dimensions, not just advertised dimensions. Ask for post-to-post clearance and interior height.
- Match the roof to the climate. Prioritize rated snow and wind performance over decorative roof shape.
- Select the cover for the intended lifespan. Fabric suits seasonal use; metal or polycarbonate is better for longer-term installation.
- Choose the anchoring system before finalizing the purchase. A strong frame is not enough if the ground connection is unsuitable.
- Check permissions and delivery access. Confirm that the assembled structure can fit through gates and that local rules allow its placement.
For most households, the best carports are galvanized-steel, 14-by-24-foot or larger structures for one full-size vehicle, with a rated vertical or boxed-eave roof and anchors designed for the actual driveway or soil. Smaller fabric shelters can be excellent value for temporary protection, while RV owners and residents in severe-weather areas should prioritize engineered load ratings, extra height, permanent foundations, and professional installation over the lowest purchase price.
Frequently asked questions
Does the advertised carport size show the actual open space for a vehicle?
No, the advertised dimensions usually describe the outside frame rather than the unobstructed space between posts. Braces, end rails, and entrance clearance reduce usable room. Measure the vehicle with its mirrors folded and unfolded, then allow space for doors, walking, and loading. A larger frame may be safer when the vehicle nearly fills the listed dimensions.
Which carport is a practical starting point for an RV or tall trailer?
An 18 × 36 ft or larger carport with a vertical-roof design is a practical starting point for an RV or tall trailer. The extra length and width provide more clearance, while additional height helps prevent problems when entering or parking. Confirm the vehicle’s full dimensions and the structure’s height, wind, and snow limits before choosing.
Can removing the side panels make a carport safe during a storm?
No, removing the side panels does not automatically make a carport safe during a storm. The roof still creates uplift and downward loads, especially on an exposed lot. The structure needs appropriate bracing, anchoring, and a frame with ratings suited to local wind and snow conditions. Open fields, hills, shorelines, and broad driveways may experience stronger gusts.
What should I check before assembling a large carport?
Before assembling a large carport, check that the site is level and arrange enough people, time, safe ladders, and calm weather. Long components, numerous connections, and a large cover can make a large frame difficult to handle. Do not lift or spread a large cover in strong wind, because it can act like a sail.
Is a thicker fabric cover enough for severe weather?
No, a thicker fabric cover alone is not enough to make a temporary frame safe in severe weather. The frame, perimeter tension, and anchors determine whether the shelter stays in place. Polyethylene is suitable for seasonal protection from sun, rain, and light snow, while vinyl-coated polyester is heavier and generally more resistant to tearing and ultraviolet exposure.
