Reduction in materials expenses to build a detached garage will not go down much more than 5 % - 7 % compare to building a free standing garage. The cost to build your garage is generally calculated by the square footage of the building along with any of the additional extras you might require. The price of a Garage Addition Contractor can vary depending on your area. Your teen will be happy to know there’s plenty of room for his future car. Images via Just Garage Plans. The cost to build a garage starts at $7,500, with most garages costing much more. Step 2 Building Size Width: 12 Feet 14 Feet 16 Feet 18 Feet 20 Feet 22 Feet 24 Feet 26 Feet 28 Feet 30 Feet Length: 12 Feet 14 Feet 16 Feet 18 Feet 20 Feet 22 Feet 24 Feet 26 Feet 28 Feet 30 Feet A good rough ballpark would be $40-$100 per square foot of construction. With the additional cost of insulation, electrical wiring, and plumbing if you choose to have a bathroom in the space, you can expect to pay between $170 and $200 per square foot, as noted in 2016 information provided on Angie's List. To hire a Garage Addition Contractor to build your garage addition , you are likely to spend between $1470 and $3500 total. On average, expect to spend around $27,000 to build a garage.This will likely up the resale value of your home by about $21,000 for an 81 percent return on your investment. A two-car attached garage with no windows and a minimum of electrical improvements will likely be far cheaper than the same two-car detached garage with windows, insulation, a 60-amp electrical service, plumbing and finished drywall. That’s a bit of a wide gap but at this point we don’t know what you’re plans are other than construction a building. Pricing & Building Costs for a 30x40 Garage. The cost to build a detached garage varies per location, the quality of building supplies used, the size of the garage and if the detached garage it built by a contractor or the homeowner. ft. Drive-thru 3-car garage. The range of prices depends greatly on size, materials and whether it’s an attached or detached garage. The average square foot cost to build a detached garage is $40-$55 when a contractor does the work and $15 when the homeowner does the work. In addition, a factor of proper connection of a new build garage to the existing house structure will keep the labor cost higher and normally total expenses will be at about the same level. The average cost to build a garage, attached or detached, will fall at around $49 per square foot, but this will, of course, depend on your chosen dimensions, your finishings and your intended uses for the garage i.e. Most people spend $16,000 to $37,000 on this project. The average cost for a Garage Addition Contractor is $2460. Almost every contractor has a story about a customer calling and asking, “How much will it cost to build a 24 x 24-foot garage?” A contractor has to answer this question carefully because actual construction cost for two identically sized garages can easily vary by $10,000 or more depending on how the client wants to build and finish it. Assumptions: This calculator estimates the cost to build a detached garage, a freestanding building which you have to walk outside to get to.This garage does not include an enclosure along the path or a covered walkway, which of course could be added for an additional expense. How much value a garage adds to your home varies. The cost range to build a garage is $11,000 to $101,000. The most important question to ask before anyone can give you a cost estimate is, what are you trying to build? 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