I built mine 3 years ago, 24 by 30, 12/12 pitch for 2nd floor storage, walk up stairs. Vinyl siding, basic garage doors. I built it,
subbed out only the concrete slab and foundation. Central Connecticut. If I back out the floor sealing, the insulation, electric and sheetrock I have about 28k in materials today would be at least double. On a simple box like that labor would be about the same as materials. garage doors and siding can vary a lot in price, roofing less so. What town makes a difference also, some towns are much more difficult to work with. I know of one town that every sub charged a 20% premium due to the building inspector being such a nitpicker. I built an addition on my sister's house for my mother, the inspector did 5 separate inspections on just the foundation, and yes each one passed. You can imagine what that does to scheduling.