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Garage demolition-basic concrete and wood structure for $4,250 being the final cost. Final Cost: $1,000. Space Converted to a Garage for $1,000. The garage in my home had been converted to a bedroom and I hired Watco to restore it back to a garage.
Give Me the Numbers. According to HomeAdvisor, the national average cost of building a garage is about $25,000, though the price can range anywhere from as little as $6,000 to more than $50,000. When calculating the cost per square foot, $30 is a good estimate for a generic, attached garage with no bells or whistles.