A very basic way to estimate the cost of building a detached garage is to simply apply a typical average per square foot construction of $80 - $100. If there are complications or you prefer top quality materials and components the price can easily will go up. This can serve as a very rough basis.
Everything will depend on the materials prices and labor expenses. Installation of cement siding and a slate roof might double the cost in comparison with vinyl siding and an asphalt shingles roof. If it is an attached garage and house design will require matching in style, costs of construction will increase as well.
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