Garages The cost to build a garage starts at $25 dollars a square foot in some parts of the country. This price for your garage does not include the excavation, foundation or any required flat work. So how much does a site built garage cost? This will depend on the size of the garage and the finishes. Some modular home factories will supply a panelized garage kit with their homes. Although this is convenient, these garages usually have a split truss roof design which requires a n expensive lam beam to be installed. | 
