Garage/Driveway remodel

Hello, I just bought a home. It is older and on a hill. The garage was listed as a 2 car but after cleaning it out, it fit only one comfortably. Also our house is on a hill as is our driveway. Our Garage is very old and poorly built. Does anyone know roughly how much it would cost to take down the garage and dig up the current driveway so that our driveway is flat and the garage is lower and there is room for an addition to the house?