subject: Concrete Garages - How To Build One [print this page] As part of the preparation process, you should remove grass, dirt clods and rocks from the entire area and then smooth out the surface with a rake. You must make the area as level as possible before you or your contractor start to set up the garage. It is also necessary to clear the ground around the garage - you will need plenty of room to move around while you work, and you do not want any obstacles that could hinder your progress or cause any physical injury.