A typical garage remodeling project can cost anywhere between $7,000 and $15,000, but the scope of the project usually falls down to as little as $3,500 to $7,000 if you do everything yourself.Turning your garage into a separate apartment can cost as much as $40,000 to $70,000. garage remodel costs much less than adding on to your house since the foundation, walls and roof are already built. The cost will actually come down to how the converted garage will be used.