Guides / Garage sizes · Updated November 2026

Garage dimensions and standard garage size

Builders don't all use the same numbers. These are the sizes plan sellers and door makers publish.

Short answer

The standard 2 car garage is 24 x 24 ft. A 1 car garage runs 12 x 20 to 16 x 24 ft. A 3 car garage is 30 to 36 ft wide and 20 to 24 ft deep.

Garage dimensions by size

Garage	Smallest	Roomy	More
1 car	12 x 20 ft	16 x 24 ft	1 car garage dimensions
2 car	20 x 20 ft	24 x 24 ft	2 car garage dimensions
3 car	30 x 20 ft	36 x 24 ft	3 car garage dimensions

Width first, then depth. Depth is from the door to the back wall.

Garage size chart

Every size the plan sellers and door makers list, with the floor area.

Garage	Size	Width x depth	Floor
1 car	Minimum	12 x 20 ft	240 sq ft
1 car	Minimum, longer	12 x 24 ft	288 sq ft
1 car	Roomier	14 x 22 ft	308 sq ft
1 car	Roomiest	16 x 24 ft	384 sq ft
2 car	Minimum	20 x 20 ft	400 sq ft
2 car	Better	20 x 24 ft	480 sq ft
2 car	Minimum (Garage Living)	22 x 24 ft	528 sq ft
2 car	Ideal	24 x 24 ft	576 sq ft
3 car	Minimum	30 x 20 ft	600 sq ft
3 car	Deeper	30 x 24 ft	720 sq ft
3 car	Roomy	36 x 24 ft	864 sq ft

What's the average garage size?

The average garage is a 2 car. Of the new single-family homes finished in 2025, 64% had a 2 car garage, 15% had 3 or more and 10% had a 1 car, per the Census Bureau. 9% had no garage or carport at all.

Nobody publishes an average garage square footage, so we won't make one up. A 24 x 24 ft 2 car is 576 sq ft. A 20 x 20 ft is 400 sq ft. See garage stats for the full Census numbers.

How much room per car

Plan on 9 to 10 ft of width and 18 to 20 ft of length for each car, per Amarr. Leave 36 in between cars so you can open the doors. A 24 ft deep garage gives you room for storage in front of the bumper.

A full-size truck changes the math. The 18 to 20 ft per car is for cars, so check your truck before you build or buy.

Garage ceiling height

Most garages have 8 to 9 ft ceilings, per Clopay. If you want an 8 ft tall door, build the walls at least 9 ft so the door has room to open, per Family Handyman. A two-post car lift needs about 12 ft.

The door size sets a lot of this. See garage door sizes for widths, heights and the room the track needs.

Garage door sizes

Door	Width x height
Single, standard	8 x 7 ft
Single, standard	9 x 7 ft
Single, wide	10 x 7 ft
Single, tall (trucks and vans)	9 x 8 ft
Double, standard	16 x 7 ft
Double, tall	16 x 8 ft
Double, wide	18 x 7 ft
Double, extra wide	20 x 8 ft
RV	12 x 14 ft

Room the door needs

Headroom, torsion springs	12 in
Headroom, extension springs	10 in
Headroom with an opener	about 15 in
Sideroom, each side	3-3/4 in
Backroom	door height + 18 in, or + 50 in with an opener