To avoid all the hassle that goes into building a garage, why don't you try a carport? They are portable and offer great protection to your cars and other heavy equipments from dust, rain, snow, etc. I got one made in my backyard from Classiccarports. It not only protects my 911 Porsche carrera 4s from all weather challenges but also gives a sophisticated look to my backyard unlike brick and mortar garages.