Detached garage plans. not every home has an attached garage. that being the case, you may consider building a detached garage. we feature a wide variety of one-car, two-car and three-car designs – many of which include overhead lofts and even apartments.. Detached garage plans provide way more than just parking! whether you want more storage for cars or a flexible accessory dwelling unit with an apartment for an in-law upstairs, our collection of detached garage plans is sure to please.. Garage plans with boat storage. a growing collection of garage plans with the boat enthusiast in mind. these garage designs offer a deeper stall to accommodate a boat on a trailer. standard garages are not typically deep enough for a long trailer that may carry a bass boat or ski boat..