This is dependent on what you are wanting if you are looking at a basic single car garage the standard would be 12 x 20. If you are looking at a 2 car garage the standard size is around 24x24. You may want to scale it to the depth of our house for cosmetic consideration.
In order to have enough space to put up a garage, the minimum size is 12 feet wide by 22 feet long. But to give you enough room, you would need it to be 2 feet longer at 24 feet long.
the standard garage size is for a 2 car garage it is 16ft by 7ft which is quiet big but usually most people have 20 by 24 and s usually around 7ft tall that is really the standard size so if you havr that space then you should have enough space to add one.
