A standard two-car garage is about 20 feet wide by 20 feet deep, or 400 square feet, which is the smallest footprint builders treat as a true two-car. The more common modern standard is 24 feet by 24 feet, near 576 square feet, because it parks two vehicles with room to open doors and walk between them. Most two-car garages fall in the 20 to 24 foot range on both width and depth.
That is the convention, not a rule. “Standard” describes the sizes the market settled on, so a builder who says “two-car” usually means a 20×20 or 24×24 footprint with a 16-foot-wide door or two single doors. This page sits under the metal garage kits pillar and gives the full picture: the standard floor, the standard door and height, and where the standard ends. For the kit-level walkthrough of this size, see the 2-car metal garage kits guide.
The footprint
The standard two-car garage footprint
The standard two-car garage runs 20 to 24 feet on each side, and those few feet change how the space feels. A 20 by 20 is the historic minimum that parks two cars and earns the name. A 24 by 24 is what most new builds use, because it adds the elbow room a 20-foot floor cannot give. Here is how the common standards compare:
| Footprint | Square feet | Where it fits |
|---|---|---|
| 20 x 20 | 400 sq ft | The historic minimum standard. Two cars, little room to spare |
| 22 x 22 | 484 sq ft | A middle step. Two cars plus a narrow storage strip |
| 24 x 24 | 576 sq ft | The common modern standard. Two cars with room to move and shelve |
| 24 x 30 | 720 sq ft | Beyond standard. Two cars plus a workbench or storage bay |
Common two-car standards, not a verdict. The right one tracks what you park and how you use the space.
Width carries more weight than depth on a two-car garage, because the two vehicles park side by side. The 20-foot width gives each car a 10-foot bay, which clears the car but leaves inches for a door swing. The 24-foot width gives each car a 12-foot bay, which is the difference between squeezing out and stepping out. Depth of 20 feet clears a standard car; 24 feet of depth lets a full-size truck fit with the door down. For the full range of widths and lengths across building types, see the cross-silo metal building sizes pillar.
Doors and height
Standard door size and ceiling height
A standard two-car garage uses either one 16-foot-wide door or two single doors near 9 feet each, paired with a 7-foot door height and an 8 to 9-foot wall. Those numbers are as much a part of “standard” as the floor is, because the openings decide what drives through.
- One wide door. A single 16-foot-wide door covers both bays through one opening and gives a clean front. It is the most common two-car setup.
- Two single doors. Two doors near 8 or 9 feet wide give each car its own bay with a post between them, which some owners prefer for looks or wind bracing.
- Door height. The standard door stands 7 feet tall, which clears most cars and SUVs. A taller truck, a roof rack, or a lift wants an 8-foot door and the wall height to match.
- Wall height. An 8 or 9-foot wall is standard and clears a 7-foot door. Step to a 10 or 12-foot wall if you want overhead storage or a taller door.
The peak adds headroom the wall number hides
A gabled roof adds a few feet at the center on top of the wall height, so a 9-foot wall gives you more clearance down the middle than the sidewall suggests. That extra height is where overhead storage and lighting live. When you compare a quote, read the door size and the wall height as separate lines, since a standard floor with an undersized door is a garage you cannot fully use. The garage door options and sizes guide covers the widths and how they fit the wall.
Beyond standard
When the standard size is not the right size
Standard answers what most people build, not what you should build. The 24 by 24 default assumes two ordinary cars and a little storage. Two things push you past it: bigger vehicles and a second job for the space. Size for what you will own, not the average car.
Two full-size trucks want 24 feet of width and 26 to 30 feet of depth, well past the standard square. A workbench, a tool chest, or a place to swing a board wants a 24 by 30 or larger. If you want the garage to work as a shop, the workshop garage combo buildings guide runs that math. For a clear-eyed look at sizing to your own vehicles and gear rather than the convention, the what size garage do I need for two cars answer walks you through it.
Standard is a starting point, not a target. The four feet you add over the default cost less than the wall you would have to move later.
Related
Read more
The standard size connects to the rest of the build. Follow these next:
- Metal garage kits: the complete guide (the parent pillar).
- 2-car metal garage kits (the kit-level guide to this size).
- Garage door options and sizes (one wide door or two, and how tall).
- Metal garage kits buyers guide (how to spec and order the whole building).
- Metal building sizes (the cross-silo range of widths and lengths).
