How much does it cost to add an addition above a garage?

Bonus Room Over Garage Cost Adding a bonus room over your garage runs around $115 per square foot. Overall, you can expect to pay about $45,000 on average for this project. You may need to make structural changes to the existing garage to support the bonus room, which will also increase the price.Click to see full answer. Regarding this, how much does it cost to add a second story over a garage?For a partial 2nd story in the 500-700 square foot range, expect to pay $90,000 to $120,000, especially if there is a new bathroom upstairs. People are often surprised to find out that a new two story, 20′ x 22′ garage (with living space on the 2nd floor) project, can cost between $100,000 and $150,000. Q3.Beside above, is it cheaper to add on or build up? According to HomeAdvisor, the average cost for building additions is between $80 to $200 per square foot without regard to whether it is up or out. While it is usually cheaper to build up than out, that’s just the actual construction expense. Costs also vary depending on exactly what the contractor must do. In respect to this, can you build an addition over a garage? Adding Onto a House Ideas: Build Over the Garage A room above a garage might prove the perfect tonic for a house with a small lot and a need for additional rooms. You’ll save on some of the construction because there will be a foundation already in place with the garage.How much does it cost to build a 20×20 room?The average room or house addition costs $86 to $208 per square foot, with most homeowners spending between $22,500 and $74,000. Adding a 20×20 family room costs $48,000 on average, while adding a 12×12 bedroom costs about $17,300.