71chmark,
I built a 24x28 garage 3 years ago.
Foundation work - cement foundation for block wall, block, pea gravel for cement pad, cement for pad = roughly $4k
I puchased the garage kit at Lowes - it was a 2 story. 2nd floor was designed to be a small efficiency apartment, included siding, 2 windows downstairs, 2 windows upstairs, 1 double noninsulated garage door manual not electric, shingles for roof, all boards needed for framing, header, and boards for roof - roughly $9K
I farmed out the foundation and roof (since it was a 10/12 pitch roof).
I built the garage.
Total $13K
My advice is to shop around. Get quotes from Lowes, Menards, Home Depot and make them compete against eachother for your business.
T1971Chally