The Average Cost of a Garage Addition

Size

• Larger garages normally cost more, which can encourage cost-conscious homeowners to keep things cozy. However, a too-small garage can create space problems. According to Garaga, a single garage should be at least 12 feet wide by 22 feet long (264 square feet), and a double garage should be 18 feet wide by 22 feet long (396 square feet). Building bigger can bring the price up. Costhelper says an 850-square-foot garage with plenty of storage space could cost $38,000 or more.

Contractor-Built

• Professionally-built garages cost more than doing it yourself. According to CostHelper, contractors usually charge $35 to $45 per square foot for a basic garage, and up to $55 per square foot for a garage built with higher quality materials. For a basic single-car garage, that comes to between $9,240 and $11,880. A higher-end, single-car structure might cost as much as $14,520.

Homeowner-Built

• If you have more experience with building projects, you may want to do some or all of the work of adding a garage yourself. CostHelper lists the price of materials for a simple single-car garage at $3,000 to $4,000. A garage kit with partially pre-cut or pre-fabricated materials costs anywhere between $5,000 and $14,000.