Bedroom Over Garage Addition
Most two car garages are about 400 square feet so you should have enough room for a nice size sleeping room and a bathroom and closet or a sizeable living space. Rule out impossible plans early on if you have a single car garage squeezing in two bedrooms and a bathroom in your bonus room is probably off the table.
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Other factors that could impact price include.

Bedroom over garage addition. Given the house s small lot and strict local zoning laws brewster sketched an addition in the only spot it could go. The cost to add a bedroom over the garage the quotes in my search online for this exact topic the general consensus was that you should plan on 300 per square foot when adding above the garage. A second story room addition above an existing garage can make a substantial change to your current home s curb appeal and of course create an increase to your living space.
A garage addition adds home value and extra space topping the couple s wish list was an extra bedroom and bath upstairs. You may need to make structural changes to the existing garage to support the bonus room which will also increase the price. Above the attached unheated garage.
However like all remodeling projects adding a second story addition has a broad range of complexity and challenges. Sooo if we wanted to add 400 square feet for a bedroom bathroom and walk in closet that would bring us to a total of 120 000 for the addition. Adding a bedroom over the garage the national association of realtors suggests you can save 20 to 60 percent by building your new bedroom over your porch garage or a previous addition instead of.
Overall you can expect to pay about 45 000 on average for this project. Adding a bonus room over your garage runs around 115 per square foot.