Metal Garage Sizes: Standard 1, 2 & 3 Car Dimensions, Door Heights & Prices
The right metal garage size depends on more than the vehicles you park. Door width, door height and the room you want for a workbench, storage or a second row of tools all add to the footprint. This guide covers the standard metal garage sizes for one, two and three cars, trucks and RVs, how to size the doors and leg height, and what each size costs installed.
Garage Size Guides
Each guide covers pricing, what fits, door options, slab size and permit notes for that size. New sizes are added to this list as they are published.
| Size | Area | Vehicles | What Fits | Installed Price |
|---|---|---|---|---|
| 20x20 Garage | 400 sq ft | 1 | 1 vehicle plus a workshop, or 2 small cars (tight) | From $4,750 installed |
| 20x30 Garage | 600 sq ft | 1 | 1 vehicle plus a 10-ft workshop, or 2 small cars (tight) | From $8,600 installed |
| 24x24 Garage | 576 sq ft | 2 | 2 cars, SUVs or half-ton pickups with a side workbench | From $9,786 installed |
| 24x30 Garage | 720 sq ft | 2 | 2 full-size trucks plus a workbench or storage wall | From $7,510 installed |
| 30x30 Garage | 900 sq ft | 3 | 3 cars or SUVs, or 2 trucks plus a workshop bay | From $10,335 installed |
| 30x40 Garage | 1,200 sq ft | 3 | 3 vehicles plus a full workshop, or a truck and trailer bay | From $15,401 installed |
Standard Metal Garage Sizes Chart
Metal garages are sold width first, then length, then leg (sidewall) height. The chart shows the common sizes by use.
| Use | Common Sizes (W x L) | Floor Area | Notes |
|---|---|---|---|
| One car | 12x20, 12x24, 18x20 | 240–360 sq ft | 12 ft wide fits one car; 18 to 20 ft adds a workbench or storage wall |
| One car plus workshop | 20x20, 20x24 | 400–480 sq ft | One vehicle with room to work on both sides |
| Two cars | 22x22, 24x24 | 480–580 sq ft | 24x24 is the standard two-car metal garage |
| Two trucks or two cars plus storage | 24x30, 24x36 | 720–860 sq ft | Long pickups, a workbench wall or a third bay for a mower |
| Three cars | 30x30, 30x40 | 900–1,200 sq ft | 30x40 is one of the most popular garage and shop sizes |
| Four cars or a large shop | 40x40, 40x60 | 1,600–2,400 sq ft | Often built as a garage with a workshop bay |
| RV or camper | 18x36 and up; 20x45+ for Class A | 650 sq ft and up | Plan a 12 to 14 ft door and taller legs |
How Metal Garage Sizes Are Measured
A metal garage listed as 24x30x10 is 24 feet wide by 30 feet long with 10-foot legs. Three details trip up buyers:
- Leg height is the sidewall height. It sets how tall your doors can be, and the roof peak sits several feet higher.
- Some builders list the roof length. As with carports, a garage listed as 20x21 may have a 20-foot frame under a 21-foot roof. Ask which number the quote uses before you pour a slab.
- Width is clear span. The full width is open inside, with no center posts, so you can lay out bays and benches any way you like.
How Wide Should A Garage Be?
Plan width around your doors as well as your vehicles. A typical car or SUV is 6 to 6.5 feet wide before mirrors, and most residential garage doors are 8 to 10 feet wide per bay. Each door also needs framing space beside it and some wall between doors.
- One vehicle: 12 feet wide fits one car with a single door. Go to 18 or 20 feet if you want a workbench or storage wall beside it.
- Two vehicles: 24 feet wide is the standard. It fits two 9-foot doors with framing between them, while 20 to 22 feet is tight for two doors.
- Three vehicles: 30 feet wide fits three 8-foot single doors, or one 16-foot double door plus a 9-foot single door.
How Long Should A Garage Be?
Most sedans and SUVs run 15 to 19 feet long, and a crew-cab pickup with a 6.5-foot bed is just over 20 feet. A 20-foot garage fits most cars with little room to walk around them. Choose 24 feet for a workbench at the back, and 30 feet or more for long trucks, a mower or tool storage.
How Tall Should A Metal Garage Be?
Pick the door height first, then the legs. A common builder rule is that the leg height must be at least 1 foot taller than the garage door. For example, an 8-foot door needs 9-foot legs and a 10-foot door needs 11-foot legs. Roll-up doors also need room above the opening for the coil, often 16 to 24 inches. Certified doors in high-wind areas need more.
| Door Height | Typical Use | Leg Height To Plan |
|---|---|---|
| 8 ft | Cars, minivans, most SUVs and stock half-ton pickups | 9 to 10 ft |
| 9 ft | Lifted pickups, trucks with racks, small work vans | 10 to 11 ft |
| 10 ft | Taller vans, small travel trailers, enclosed utility trailers | 12 ft |
| 12 ft | Fifth wheels, larger travel trailers, toy haulers | 14 ft |
| 14 ft | Class A motorhomes and large equipment | 16 ft |
Measure the tallest point of your tallest vehicle, including the roof AC unit, antennas or ladder rack, and add 12 to 18 inches before you choose a door.
Doors, Windows And Framed Openings
Most metal garage prices start without doors, windows or walk-in doors, so add them to your quote. Common choices include:
- Roll-up doors: 8x7, 9x7, 9x8 and 10x8 for cars and trucks; 10x10 and up for trailers and RVs
- Walk-in door: A standard 36-inch door, so you are not opening the big door every time
- Windows: For light and ventilation
- Framed openings: A frame-out lets you install a standard residential overhead door later
Roof Style, Gauge And Certification
A vertical roof is the usual choice for an enclosed garage because it sheds snow, rain and leaves best and stands up to more weather. Framing is 14-gauge steel tubing as standard, with 12-gauge as an upgrade. A certified building comes with engineered drawings for your county's wind and snow loads, which most building departments require for an enclosed garage.
Concrete Slab And Anchors
Most enclosed metal garages go on a concrete slab, with concrete anchors around the base. Build the slab to the frame size your builder gives you, square and level, and confirm whether the quote lists frame or roof length before you pour. Ask your builder for the slab specifications they need.
Do You Need A Permit For A Metal Garage?
In most places, yes. Nearly every garage is larger than the 120- or 200-square-foot small-structure exemptions some codes use, and enclosed buildings get more scrutiny than open carports. Check permits, setbacks and required wind and snow ratings with your local building department before you order.
Metal Garage Prices By Size
In one 2026 published price guide, installed metal garages started at $9,786 for a 24x24, $11,817 for a 24x30 and $15,401 for a 30x40, with a 30x50 at about $24,300. Builder price sheets can start lower when doors and windows are left off. In our October 2026 check, one 20x20 enclosed vertical-roof garage with 9-foot legs was listed from $4,750 installed, with doors and windows extra.
The biggest price drivers are leg height, the number and size of doors, 12-gauge framing, certification, insulation, and your delivery zone.
Carport Or Garage?
An open carport costs far less than an enclosed garage of the same size, and many buyers start with a carport and enclose it later. If you might, tell your builder when you order so the frame is braced and certified for walls. Compare sizes in the carport sizes guide, or see the 24x30 carport and 20x20 carport guides. Browse all metal garages or double car garages.
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Metal Garage Size FAQs
What Is The Standard Size Of A 2-Car Garage?
For a metal garage, 24x24 is the standard two-car size. It fits two vehicles and two 9-foot doors. A 24x30 adds room for long pickups or a workbench wall.
What Size Is A 1-Car Metal Garage?
A 12x20 fits one car with a single door. Many buyers choose 18x20 or 20x20 to add a workbench or storage beside the vehicle.
What Size Is A 3-Car Metal Garage?
Most three-car metal garages are 30x30 to 30x40. The 30x40 is one of the most popular garage and shop sizes because it fits three bays plus storage.
How Tall Should A Metal Garage Be?
Choose the door height first. Builders generally want the legs at least 1 foot taller than the door, so an 8-foot door needs 9-foot legs. RVs and fifth wheels often need 12- to 14-foot doors and 14- to 16-foot legs.
What Size Garage Door Do I Need For A Pickup Truck?
An 8-foot-tall door fits most stock half-ton pickups. Choose a 9-foot door for lifted trucks or trucks with racks, and a 9- or 10-foot width for comfortable clearance.
How Much Does A Metal Garage Cost?
In our 2026 updated price guide, installed metal garages started at $9,786 for a 24x24, $11,817 for a 24x30 and $15,401 for a 30x40. Base prices from builders can be lower when doors and windows are priced separately.
Can I Turn A Metal Carport Into A Garage?
Often, yes, by adding walls, gable ends and doors. Tell your builder before you order the carport so the frame is braced and certified for an enclosed building.