There are many factors in pricing a garage. How oversized, totally finished on the inside or just basic, insulation if you want to, electrical, what kind of siding you want, roof, cost of materials and labor in your area. The best way to know is to contact a contractor, get an estimate from at least three, make sure all the details you want included are in the estimate. They will be able to get necessary permits and inspections needed to have the garage up to code for your area.
How to Determine the Cost per Square Foot of Building a Garage
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To build a garage yourself you can figure about $40 per square foot for the materials. I hope this helps. To figure the square foot multiply the length times the width. For example if you were building 20 x 20 garage, that 400 Square ft times $40 is around $1,600.