Best Carport Size for Semi-Trucks

Quick Answer:
For a standard semi-truck with a 53-foot trailer, the best carport size for semi trucks 40 ft wide, 75 ft long, and 16 ft tall. For a cab-only setup, 20 ft wide and 30 ft long at 14 ft height works. Always add 2 ft of clearance beyond your vehicle’s actual height.

Sizing a carport for a semi-truck is not the same as sizing one for a pickup. Get it wrong, and you end up with a structure you cannot use. Get it right, and you have a durable metal shelter that protects your rig, reduces maintenance costs, and holds up for decades.

This guide will help you come up with the best carport size for semi trucks. You will know the exact truck carport dimensions you need, a complete size breakdown by truck type, a state-specific note for Washington, and a pricing overview so you can plan without surprises.

First, Know Your Semi-Truck’s Actual Dimensions

Before you look at carport sizes, you need accurate numbers for your specific rig. Standard dimensions vary by configuration:

• Standard semi (tractor + 53 ft trailer): 70 to 80 ft long, 8.5 ft wide, 13.5 ft tall
• Day cab only: About 20 ft long, 8.5 ft wide, 13.5 ft tall
• Sleeper cab only: Around 20 to 25 ft long, same width and height
• With refrigerated or high-cube trailer: Can reach 14 ft to 14.5 ft tall

Never size a carport to match your vehicle exactly. Add at least 2 ft of height clearance and 3 ft of width on each side for safe maneuvering.

These numbers come directly from FHWA federal standards. Most semi-trucks on U.S. roads fall within these ranges, but always measure your specific rig before ordering.

Recommended Carport Size for Semi Trucks by Configuration

Here is direct truck carport dimensions based on truck type. So, you can decide what size carport for semi truck is best. Use this as your starting point, then adjust for your site and weather conditions.

If you are covering two trucks side by side, a 60 ft wide span is the minimum. Anything tighter makes parking and door access difficult on both sides.

1. Getting the Width Right

Width is the dimension most buyers get wrong. A semi trailer is 8.5 ft wide, but mirrors, safety equipment, and side clearance push the real number up. For the best carport size for semi trucks, measure the width carefully.

For a single semi parked under a carport, 40 ft wide is the practical minimum. This gives you roughly 16 ft of clearance on each side of the truck, which is enough to walk around it, open utility doors, and maneuver without stress.

If you need to park two semis under one roof, customize a three car metal carport or a wide-span custom build starting at 60 ft. This gives each truck its own lane and room to operate independently.

2. Height Clearance: The Most Overlooked Specification

A standard semi stands 13.5 ft tall. That sounds manageable until you factor in the roof arc on a standard carport. The peak height is not the same as the side height, and that difference catches a lot of buyers off guard.

Side height, also called leg height, is the actual clearance your truck drives through. Here is what to target:

• Standard semi: Minimum 16 ft leg height (2.5 ft clearance above a 13.5 ft truck)
• High-cube or refrigerated trailer: 16 to 18 ft leg height
• Trucks with rooftop equipment: 18 ft or higher depending on the add-on height
• Pickup truck: 10 to 12 ft standard, 12 to 14 ft for lifted or camper-equipped

Always ask your carport supplier for the side height, not the peak height. These are two different measurements and only one of them matters for your truck.

A vertical roof carport is the right roof choice at these heights. The vertical panel orientation channels rain and snow off the sides efficiently, reducing load stress on a tall structure over time.

3. Length: Plan for the Full Rig

This is another area where buyers consistently underestimate and get confused to decide what size carport for semi truck. A day cab alone runs about 20 ft. Hook on a 53-foot dry van trailer, and your total length jumps to 70 to 80 ft.

Ordering a carport that only covers the cab is a common and expensive mistake. The trailer takes the brunt of weather exposure since it is the largest surface area. Size for the full combination:

• Cab only: 30 ft minimum length
• Cab + standard 53 ft trailer: 75 to 80 ft minimum
• Cab + pup trailer (28 ft): 50 to 55 ft minimum
• Double pup trailer setup: 60 to 70 ft minimum

For fleet operations, look into metal carport with storage configurations. These allow you to add enclosed storage for tools, parts, and equipment on one end of the structure without a separate build.

Standard Carport Size in Meters vs. Feet

If you are comparing specs across international suppliers or working with metric measurements, here is a quick conversion reference for the standard size of carport in meters and the standard carport size in feet.

Carport Size for Semi Trucks in Washington State

Washington State requires building permits for most permanent carport structures, especially those exceeding 200 square feet. A semi-truck carport will almost always exceed that threshold.

Washington also sits in a high-wind zone along the coast and a moderate-to-heavy snow load zone in the eastern regions and Cascade foothills. This has a direct impact on which carport specifications you need:

• Western Washington (coast, Puget Sound): Wind rating of 110 mph or higher is commonly required
• Eastern Washington and Cascade foothills: Snow load certification of 30 to 50 psf depending on elevation
• Permits: Most counties require stamped engineering drawings for spans over 30 ft wide

Wondering whether your structure can handle the weather? Read whether a carport can survive high winds for a full breakdown of wind ratings, anchoring requirements, and what to look for in certified steel structures.

Always check with your local county building department before purchasing. Permit requirements vary between counties and can affect your site prep, anchoring type, and final build cost.

Carport Sizes and Prices: What to Expect

Pricing for semi-truck carports depends on four main variables: span width, length, leg height, and whether certifications are required. Here is a realistic range:

• Day cab carport (20x30x14): Starting around $4,000 to $6,000
• Full semi carport (40x75x16): Starting around $12,000 to $18,000
• Two-semi carport (60x75x16): $22,000 and up depending on certifications
• Certified (wind + snow rated) builds: Add 15 to 25 percent to base price

Certifications are not optional in most states for large spans. Budget for them upfront rather than discovering the requirement after ordering.

For a clearer picture of what a mid-range certified structure looks like at a real price point, understand how a carport can be more than a parking space and the long-term value it delivers beyond basic shelter. It highly depends on the best carport size for semi trucks.

Beyond Parking: Getting More from Your Semi-Truck Carport

A well-sized semi-truck carport does more than park a rig. Fleet operators use them to cover maintenance bays, store equipment, and protect trailers during off-season. If your operation involves more than just a truck, read our guide on how to store trucks, ATVs, and RVs in a metal structure for layout strategies that work across mixed fleets.

Adding side panels, end walls, or a roll-up door converts a basic carport into a functional enclosed bay. This is particularly useful for operations in high-wind or high-snow regions where open-sided structures lose effectiveness in severe weather.

Frequently Asked Questions

What is the minimum carport size for a semi-truck?
For a full cab-and-trailer combo, the minimum is 40 ft wide, 75 ft long, and 16 ft tall. Smaller configurations like day cabs can work with a 20 ft wide and 30 ft long structure at 14 ft leg height.

What size carport fits 2 trucks side by side?
Carport size for 2 trucks needs a minimum of 30 ft wide. Two semi-trucks side by side need at least 60 ft wide with 16 to 18 ft leg height to allow safe maneuvering on both sides.

How tall should a carport be for a semi?
The minimum leg height for a standard semi standing 13.5 ft tall is 16 ft. If your trailer is a high-cube or has rooftop equipment, go to 18 ft. Always measure your specific rig first.

Do semi-truck carports require permits?
Yes, in most states. Large-span structures almost always require building permits, and many counties require certified engineering drawings. Washington State enforces this strictly, especially for spans over 30 ft.

What roof style is best for a semi-truck carport?
A vertical roof carport is the best choice. Vertical panels shed rain, snow, and debris far more effectively than horizontal options, which reduces long-term stress on the structure.

Ready to Size Your Semi-Truck Carport?
Use the tables above to identify your starting dimensions, factor in your local weather and permit requirements, and get a quote built around your actual rig. This way, you can quickly ensure the best carport size for semi trucks. Moreover, steel prices shift seasonally. Getting your quote now locks in current pricing before your next build window.