How hard would it be to just pour a concrete slab, stack up some cinder blocks, insulate, and cap it with a roof?
You'll have to check with local building codes to be able to come up with a half way decent price. Also prices vary from area to area. Around here you have to have a footer 3'deep and the block has to be one block above ground level. To lay block a mason gets $1.25/block regular and $1.75/termite block. You can buy garage kits for anywhere from a shed to a three car garage. Usually the lumber companies advertise these as standard packages. A 2 car garage (24x24) deluxe that includes overhangs and vinyl siding goes for around $2400-$3000 not including foundation. If you can build it yourself or have a bunch of buds that knows what they are doing will save quite a bit. Doing it that way with foundation and all will run around $5000. That does not include any insulation etc. Just a basic garage. to have someone do it would probably cost double that and maybe more. It pays to shop around and find who can do what as far as digging footers, laying block, pouring concrete, and anything you can do yourself saves. Also, if is attached to a house, saves one wall and one foundation wall from being put up, which is a savings. I built a 28'x36' w/6' overhangs in the front and side, vinyl siding, finished off on the inside and had $5000 in just the driveway, floor and foundation and again that much in the garage. I built the garage myself (Weimer and I). If I had hired contractors I would have had $25-30,000 in it.