Question: how much does it cost to add a third garage stall?
Answer: The average cost to build a 3-car garage is between $28,200 and $42,300. The most common 3-car garage sizes are 24' x 24' and 36' x 24'. Overall, you can expect to pay around $49 per square foot, with the average 3-car garage ranging from 576 to 864 square feet.