I am in the process of building a garage now. Mine is a single story 24'X30' with 10' walls and a 4/12 roof pitch. I had the concrete done by a contractor. The slab is monolithic and is 4" thick. The cost was 4,000.00 US. The building is wood frame with hardie board siding and a metal roof. Building materials cost 6,000.00. The cost to have the building contracted out would have been 16,000 to 20,000 but would already be done. If you want upstairs storage you will want a steeper roof pitch to allow the space.

jb317, can you share with us how you obtained the plans for your garage? Did you have them custom designed or did you buy them?

Thanks.

My husband and I are also planning a garage (we're in the DC Metro area). 3 bays and a large workshop. Our original plan called for storage space upstairs. We contacted about 10 local builders in our area. Of those who actually responded (2) the costs were out of sight. 80 - 150k!! We scaled down the plan so that there is no storage space upstairs (this increases the lumber cost) and are working as our own general contractor. We just submitted plans we bought online to the local permits dept. We estimate cost to be around 50k. We're hoping to save on some costs by buying the windows, entry door and whatever else I can find off of Craigslist or eBay.

Size 30x60, 3 bays plus workshop, 8/12 roof (matches house), detached. Good luck!