Question: what is the average square feet of a 3 car garage?
Answer: Average Three Car Garages Three car garages are usually 32 feet wide by 22 feet deep. Much like 18 x 20 2 car garages, 32 x 22 feet snugly fits 3 cars. Your other, larger options include 36 x 25 feet, 38 x 26 feet and 40 x 30 feet.