Are you designing your dream garage? The standard single-car garage size is 12 feet wide by 20 feet deep (12×20), but this may not suit all spaces.
Because no two homeowners have the same setup, the “right” garage size depends on your vehicles and how you’ll use the additional space — whether that’s for parking, a workshop, or a small home gym.
This guide breaks down average garage measurements for 1–4 car garages, including width, depth, and total square footage. You’ll also find diagrams, quick-reference tables, and answers to common questions to make your design practical and functional.
Average Garage Measurements
The garage dimensions below generally provide enough space to open your car doors without scratching your paint or hitting the walls.
| Garage Size | Width (ft.) | Depth (ft.) | Area (sq. ft.) |
| 1 car | 12–18 | 20–30 | 240–540 |
| 2 cars | 20–24 | 20–30 | 360–660 |
| 3 cars | 30–36 | 20–30 | 600–1,260 |
| 4 cars | 40–48 | 20–30 | 800–1,600 |
One-Car Garage Size
The average one-car garage size is 12 feet wide and 20 feet deep (12×20). This size is just large enough to fit one full-size car, minivan, or SUV. A single-car garage usually has a 9-foot-wide garage door.
If you plan to store tools, lawnmowers, and other equipment in a one-car garage, you should opt for an 18-foot-wide garage (a “one-and-a-half-car” garage). You may also want to consider a garage that is deeper than 20 feet, which provides extra storage space. Additional sizes for a one-car garage include 12×25, 12×30, 18×25, and 18×30.
Standard garage dimensions for one car are:
- Width: 12 feet or more.
- Depth: 20 feet or more.
- Door width: 8- to 10-feet wide.
Two-Car Garage Size
A standard two-car garage size is a minimum of 20 feet wide by 20 feet deep (20×20).
Depending on the type of car you have, a standard 20×20 garage can be a bit cramped for two cars. You’ll want to ensure you can open car doors without hitting the other car or the wall.
A 22-foot-wide garage is a more comfortable fit for two average-sized cars, and a 24-foot-wide garage allows two large vehicles to park side-by-side. These vehicles can fit in a garage that is 20 feet deep, but a deeper garage will provide ample space. Other common sizes include 20×30, 24×25, and 24×30.
Standard garage dimensions for two cars are:
- Width: 20 feet or more.
- Depth: 20 feet or more.
- Door width: Two 8- to 10-foot-wide doors or one 16-foot-wide door.
Two-and-a-Half-Car Garage
Standard two-and-a-half-car garage dimensions are generally 26 feet wide and at least 20 feet deep (26×20). This size is a little larger than the usual two-car garage but smaller than a three-car-sized version. The extra garage space is ideal if you have additional vehicles such as a motorcycle or for a storage or workshop area.
Additional two-and-a-half-car garage dimensions include 26×25, 26×30, and 28×30.
Three-Car Garage Size
While the standard size for a three-car garage is 32 feet wide and 22 feet deep (32×22), a more ideal size is 36×24. The larger dimensions create additional room for trucks or storage.
Other popular dimensions for detached three-car garages include 32×24, 34×24, and 36×28.
To cut costs on this particular garage size, placing three garage doors on the side of your garage is less expensive than placing doors on the front (gable) end.
Standard garage dimensions for three cars are:
- Width: 30 feet or more.
- Depth: 20 feet or more.
- Door width: One 8- to 10-foot-wide door and one 16-foot-wide door.
Four-Car Garage Size
The average four-car garage size is at least 40 feet wide and 20 feet deep (40×20), but a 24×45 garage is a more spacious size to park four cars comfortably. This allows you to park the less frequently used cars in the back of the garage and your daily drivers in the front. You can also explore drive-through garages for easy vehicle access.
While a four-car garage isn’t as common as the others, many people who purchase this size use their garage as a workshop.
Similar to the three-car size, if you want to park all your cars in parallel, it’s more affordable to place four garage doors on the side of your garage as opposed to the front (gable) end, because this design has a shorter, less-expensive roof.
Standard garage dimensions for four cars are:
- Width: 40 feet or more.
- Depth: 20 feet or more.
- Door width: Four 8- to 10-foot-wide doors, or two 16-foot-wide doors.
Garage Door Dimensions
As for garage doors, the standard height is 7 to 8 feet. The height, also referred to as the length, measures from the threshold to the door top. Door lengths are generally the same for all garage sizes unless you have an unusually tall vehicle like an RV.
Garage door widths, on the other hand, vary by garage size:
- One-car: 8–10 feet wide.
- Two-car: Two 8–10 feet wide or one 12–16 feet wide.
- Three-car: One 8–10 feet wide and one 12–16 feet wide.
- Four-car: Two 12–16 feet wide.
Choosing a Garage Size: Factors to Consider
Now that you have an understanding of different garage sizes, the next step is to consider your intended use and specific needs. Below are a few factors to keep in mind while customizing your space.
Number of Vehicles
How many vehicles do you own? Aside from cars, you may also need space for bikes, motorcycles, golf carts, scooters, and ATVs.
Size of Vehicles
It’s also ideal to know the average sizes of your vehicles, since some cars are small, and some are very big. A full-size car, minivan, or SUV is typically 14 to 17 feet long and at least 6 feet wide. In this case, a garage size at least 24 feet deep is ideal.
Attached vs. Detached Garage
To decide on the type of garage, consider the pros and cons of each.
If you have an attached garage, it is really easy to get into your house after parking. However, attached garages must be custom-built on-site to connect to the house, and hiring a builder will be more expensive than buying a prefabricated (pre-built) detached garage.
As for detached garages, a metal garage is the most affordable option. Since they’re prefabricated, they waste less material and help cut costs on labor. Additionally, detached garages offer more privacy.
Storage Space
If you need additional storage space for lawn and gardening tools, off-season decorations, and other recreational items, opt for a garage with more square footage than the average size. This will allow enough space between storage items and the parked cars inside.
Additional Uses
Many people use their garage for more than parking and storage. You can turn your garage into a gym, a lounge area during the warmer seasons, and more. With this in mind, some people may prefer a two- or three-car garage size even if they own only one car.
2025 Trends in Garage Sizing
Here are three trends shaping garage design this year:
- Customization. Many buyers are moving away from standard dimensions and choosing custom garage sizes instead. Extra depth gives room for trucks, added width creates more space for shelving, and larger layouts make it easy to include a workshop.
- Security. More people are selecting high-quality roller doors that combine convenience with strength. These spring-loaded, steel-built doors roll up smoothly to save space and keep belongings protected. Each door can be sized to match the garage’s width and height, making them ideal for both one- and two-car garages.
- Height and storage efficiency. Taller garage designs are gaining popularity, with many choosing 10- to 12-foot walls to fit lifted vehicles, overhead storage, or ceiling-mounted racks.
Customer Spotlight: Scott’s 24×35 Garage
Meet Scott, one of our many satisfied customers. He purchased a 24×35-foot metal garage and couldn’t be happier with the result. Built with durable steel framing and spring-loaded roll-up doors, his garage functions as a workspace and tool storage area. Scott shared that he was especially impressed with the overall quality, design, and price of his new building. Check out his testimonial below:
Like Scott, many of our customers leave glowing reviews about their experiences with Alan’s Factory Outlet, often noting our fast delivery, attention to detail, and transparent pricing!
Which Garage Size Is Best for You?
The best garage size will be the one with the right amount of space for your needs. What better way to achieve this than creating a custom metal garage? It’s affordable, sustainable, and quick to install.
Designing your dream garage is only one click away. Check out our 3D Garage Builder now.
Frequently Asked Questions
Here are answers to the most common questions about customizing a new metal garage.
Do I need a permit to build a standard garage?
In most areas, yes — especially if your garage is large or has electrical or plumbing connections. Permit requirements vary by state, so always check with your local building department before ordering. You can review our Garage Buyer’s Guide for permit and foundation tips.
What is the average size of a two-car garage?
The average double garage is around 20×20 feet, but you may prefer 24×24 to protect larger vehicles. That gives you space to open car doors fully, store tools, and still walk between vehicles without feeling crowded.
How deep should a garage be for a full-size truck?
A full-size pickup usually needs at least 24 to 28 feet of depth. If you drive a longer model with accessories like a tow hitch or toolbox, 30 feet of depth gives you extra clearance and room for storage in front.
Can I use a one-car garage as a workshop?
Absolutely. If you plan to add a workbench or tool area, look for a 1½-car garage (around 18×25 feet). This size gives you ample space to park one car plus enough room for projects or equipment.
What’s the best garage size if I also need storage space?
Go one size up from what you think you need. For instance, if you own two cars but want room for general equipment, garden tools, or bikes, a 24×30 garage offers space for parking and storage. You can also customize your own design in our 3D Garage Builder to visualize the space.
Do metal garages come in custom sizes?
Yes — all Alan’s Factory Outlet metal garages are fully customizable. You can adjust the width, length, and height to fit anything from compact cars to trucks or boats. Choose your color, style, and siding preferences, too!
What garage door width should I choose?
For a single-car garage, choose a 9- or 10-foot-wide door. Two-car garages can have two single doors or one double door (16 feet wide). If you’re storing bigger vehicles or equipment, go wider to make entry easier.
How much does a 24×24 garage cost?
The price depends on your materials, roof style, and location, but metal garages in that size typically start around $6,000. Check out our metal garage price page for a full cost breakdown.
