1 Upgrading the quality of materials can bump the cost to $55 a square foot, or $13,200 for a minimum single-car structure, $21,000 for a two-car garage and $47,000 or more for the dream version.rittihs) we got a quote in less than 45 mins. for a 1.5 car garage the estimate is $12,354 for a 2 car garage (with a short approaching driveway) will cost us $16,325 this includes the demolition of old garage, 30 year roof, all electrical, slab, garage door, an entrance door and 1 window.