How much would it cost to soundproof a room?
From a little to a whole lot, depending on how you want to do it. Egg shells are obviously the cheapest. But that won’t eliminate all of the noise. I’ll paste some tips below. Good luck! Most interior doors are hollow core and provide almost no noise reduction. By installing acoustical ceiling tiles on the inside of the door you can reduce the noise level significantly. You will want to purchase 12″ x 12″ tiles from your local hardware store. Most of these tiles have a pre-fitted edge which makes lining them up simple. You may need to cut some of the tiles along the door edges to get an exact fit. Use a utility knife and a straight edge (ruler) to make a precise cut. You can also apply a door sweep to the bottom of the door. This will prevent sound from escaping underneath the door. You will need a hack saw to cut the sweep to the proper length. But measure before you go to the hardware store, they may have your exact length. To reduce noise from one room to another, you will want to s