Garage sizing can get confusing fast, because a "2-car garage" means something different depending on who you ask. We build these every day, so let’s explore the standard garage sizes for 1, 2, 3, and 4-car buildings, with the real width and depth numbers behind each one.
Key Highlights
- A 1-car garage typically starts around 12 to 20 feet wide, with 18x20 being the size most homeowners order.
- A 2-car garage usually runs 19 to 26 feet wide and 20 to 30 feet deep, enough for two vehicles plus a workbench or shelving.
- A 3-car garage generally needs 28 to 32 feet of width, which is where many buyers start thinking workshop instead of garage.
- A 4-car or commercial-width garage runs 36 feet and wider, built for fleet vehicles, farm equipment, or business use.
- Depth matters as much as width. A garage that's plenty wide can still be too shallow for a full-size truck or a boat with a trailer tongue.
- Roof style and eave height change how much usable space you get without changing the footprint.
- Design Your Building at Coast to Coast Carports to get exact pricing on the size that fits your vehicles and your lot.
How Garage Size Is Actually Measured
Every metal garage we build gets specified three ways: width, depth, and height. Width is the side with the garage door. It's the number that decides how many vehicles fit side by side. Depth is how far back the building runs, front to rear.
Height is the eave height, measured where the wall meets the roofline, not the peak.
Buyers usually fixate on width because that's what "2-car" or "3-car" typically refers to. But depth decides whether your truck's tailgate clears the back wall, and height decides whether an RV or a lift fits inside.
Get any of those wrong and the car count on the spec sheet doesn't mean much.
We list every garage as width x depth x height. An 18x20 vertical roof garage is 18 feet wide, 20 feet deep, with a standard eave height of 8’. A 20x30x10 two-car garage adds height to that same footprint, which matters if you're storing a lifted truck or want room for a storage shelf above the vehicles.
1-Car Garage Dimensions: What You Actually Get
A single-bay garage is built for one vehicle plus enough room to actually use the space around it, workbench included.
Our narrowest options start at 12 feet wide, like the 12x20 Steel Garage. These work well as dedicated storage: a mower, hand tools, a motorcycle, or a small car with nothing extra. Twelve feet leaves almost no walk-around room once a vehicle is parked.
The 18x20 One Car Garage is the size most homeowners actually order. Eighteen feet is wide enough to open both car doors fully and still hang a pegboard wall or fit a chest freezer along the side. Twenty feet of depth covers a full-size sedan or a short-bed truck with a couple feet left over for a workbench.
Storing a longer truck, an ATV, or want space for a small bench along the back wall? Look at the same 18-foot width in a 26 or 30-foot depth instead.
Compare your options: Start with our metal garages, review the 18x20 One Car Garage, or call (866) 681-7846 to discuss the space you need.
2-Car Garage Dimensions: The Size Most People Order
Two-car is a common request we get, and also the size range with the most confusion. General averages get thrown around online, but they don't reflect what a metal building actually needs.
Our two-car builds run 19 to 26 feet wide. The 19x25x9 Two Car Garage is the tightest layout that still fits two vehicles with door clearance. Step up to the 26x30x10 Two Car Garage and you get real breathing room: shelving along one wall, a workbench along the other, and enough depth for two full-size trucks.
A 20-foot-wide garage fits two compact cars comfortably. Two full-size trucks, or a truck and a boat trailer, need closer to 24 or 26 feet, or both doors get tight to open at the same time.
If you drive a dually or a crew-cab truck, measure your vehicle's mirror-to-mirror width first. Add at least 3 feet of clearance on each side before you settle on a number.
Farmers and contractors: this is usually the size where a second door earns its cost. A 20x26 Two Car Garage with two separate roll-up doors lets you pull one vehicle out without moving the other, which matters more than people expect once winter hits.
Need a two-vehicle layout? Browse our Two Car Garages, then Design Your Building with the width, height, doors, windows, and layout you want.
3-Car Garage Dimensions
Three-car garages jump to 28 to 32 feet wide, and this is where buyers start asking for a workshop instead of a garage. The extra bay rarely holds a third car. More often it's a boat, a side-by-side, welding equipment, or just floor space nobody has to walk around.
Our 30x40 Metal Garage is a common starting point, giving you three full bays plus depth to spare. Want covered parking on one side and enclosed storage on the other? The 28x40x12 Garage With Lean-to handles that split well, and it suits farm equipment that doesn't need full enclosure year-round.
Twelve-foot eave height starts showing up regularly at this size. That extra height means a work truck with a ladder rack, a camper shell, or a small RV can clear the door without a custom order.
4-Car and Commercial-Width Garages
At 36 feet and wider, these buildings function as light commercial space, built for fleet vehicles, farm equipment lineups, small business inventory, or a serious personal collection.
The 42x60 Commercial Garage and the 36x40 commercial garage both run at taller eave heights, built to handle box trucks, tractors, or stacked storage. Most buyers at this size add a side lean-to or a second roll-up door instead of just going wider. One massive opening loses heat fast and makes the building harder to secure.
If you're outfitting a shop for a business, certification tends to matter more here. Commercial use in most areas calls for engineer-stamped drawings, and requirements vary by county, so check with your local building department before you order.
Planning space for equipment, fleet vehicles, or business storage? See our Commercial Buildings or Request A Quote for a building based on your site and intended use.
Standard Garage Size Chart: Width, Depth, and What Fits
| Car Count | Typical Width | Typical Depth | Best For | Example Build |
|---|---|---|---|---|
| 1-Car (Compact) | 12'-14' | 20'-26' | Storage, mower, motorcycle | 12x20 Steel Garage |
| 1-Car (Standard) | 18' | 20'-30' | Sedan or short-bed truck, walk-around room | 18x20 One Car Garage |
| 2-Car (Standard) | 19'-20' | 25'-30' | Two compact vehicles | 19x25x9 Two Car Garage |
| 2-Car (Wide) | 24'-26' | 20'-30' | Two full-size trucks, second door option | 26x30x10 Two Car Garage |
| 3-Car | 28'-32' | 30'-50' | Third bay for a boat, equipment, or shop space | 30x40 Metal Garage |
| 4-Car / Commercial | 36'-42'+ | 30'-60' | Fleet vehicles, farm equipment, business use | 42x60 Commercial Garage |
Still deciding between an open carport and a fully enclosed garage? Our guide on Choosing the Right Kit: Carport vs. Garage walks through when each one makes sense. And before you lock in a size, the Checklist for a First-Time Metal Building Buyer covers the site prep and permit questions people usually forget to ask.
Still comparing before you buy? Read Carport vs. Garage and our First-Time Metal Building Buyer Checklist before you settle on the final footprint.
What Actually Changes the Size You Need
Car count is the starting point, not the whole answer. A few things push buyers up a size even when they only own two vehicles.
Roof Style
Roof style changes usable space without changing the footprint. A vertical roof sheds snow better and gives you more clearance near the peak than a regular or horizontal roof, which matters if you're storing anything tall near the center of the building.
Storage Space
Storage habits matter more than most people plan for. If your garage tends to become the default spot for lawn equipment, holiday decorations, and bikes, add depth instead of width. That keeps the clutter along the back wall instead of eating into your parking space.
Lean-tos
Attachments change the math too. A lean-to on one side adds covered space without pushing the whole structure into full enclosure territory, which works well for equipment that just needs to stay dry.
Foundation Type
A solid foundation matters just as much as the footprint on top of it. Our post on pouring a slab foundation for a carport or garage walks through what that prep looks like before your building shows up.
Not sure which way to go? That's exactly what a quote conversation is for. Design Your Building with your real vehicle measurements and site details, and we'll help you land on a size that actually works instead of guessing from a chart.
Ready to plan the purchase? Design Your Building in the 3D Estimator, review available Financing or Rent-To-Own, or call (866) 681-7846.
Frequently Asked Questions
What is the standard size for a 2-car garage?
Most 2-car metal garages run 20 to 26 feet wide and 20 to 30 feet deep.
How wide does a garage need to be for two full-size trucks?
Plan on at least 24 feet of width, and 26 feet if you want comfortable walking room between the vehicles.
Is an 18x20 garage big enough for one car and storage?
Yes, for most sedans and short-bed trucks. Eighteen feet gives you full door clearance plus a few feet along the side wall for a workbench or shelving. If you need more storage depth, the same 18-foot width is available in 26 and 30-foot depths.
Do I need a permit for a metal garage this size?
Permit requirements vary by county and city, so check with your local building department before you order. Larger structures and anything used commercially are more likely to require engineer-stamped drawings, and we can provide those when needed.
What size garage fits an RV or a boat with a trailer?
Width alone won't tell you. You need enough depth to clear the tongue or hitch, plus eave height tall enough for the roofline. Most RV and boat storage starts at 30 feet deep with 12-foot or taller eaves. Call us at (866) 681-7846 and we'll work the exact dimensions with you.
Can I add extra height to any of these garage sizes?
Yes. Eave height is independent of width and depth, so you can order a compact 1-car footprint with a taller wall if you need clearance for a lift or extra storage above the vehicle.
What's the real difference between a 3-car garage and a commercial garage?
Mostly eave height and door count. A 3-car garage in the 28 to 32-foot range usually runs 9 to 12-foot eaves with one or two doors. Commercial-width buildings at 36 feet and up typically run 14 to 16-foot eaves with multiple doors, built for taller vehicles and equipment.
Finding Your Actual Number
Car count gets you in the right neighborhood, but width, depth, and eave height are what actually decide whether your vehicles, tools, and equipment fit the way you want. Measure what you own now. Plan a little extra for what you'll own in five years, and don't be afraid to size up a foot or two if you're stuck between options.
Ready to see exact pricing on your size? Design Your Building at Coast to Coast Carports, or call us at (866) 681-7846 and one of our building specialists will help you land on the right dimensions the first time.
Build around your actual vehicles and storage needs. Design Your Building • Request A Quote • Call (866) 681-7846
