How much does it cost to decorate a soundproof room of about 20 square meters?

A 20-square-meter house is 5 meters long, 4 meters wide and 2 meters high, with a wall area of 50.4 square meters, a floor of 20 square meters and a roof of 20 square meters.

A door 1.8 m2, a window 2 m2.

Dual effects of sound absorption and sound insulation on the wall 1.5W, vibration damping floor 0.5W, elastic ceiling 0.8W, metal sound insulation door 0.3W, full-frequency sound insulation window 0. 16W. The above price includes labor costs, but does not include exterior decoration materials and labor. Total: 3.2W price.

The effect can basically meet the requirements. If you add surface decoration, you can make an audio-visual room.