We are limited by hauling regulations in some areas as to the actual width of the storage shed. The current regulation is 12′. For this reason, 12′ wide storage sheds are measured from eave to eave. Our 8′ and 10′ wide storage sheds are measured from wall to wall. In some areas, 12′ wide storage sheds can be built to be 12′ wide on the floor measurements. Please contact your local dealer or Weather King to assist in the further answering of this question.