Whether you're a musician or have some other reason for wanting a soundproof room, you don't have to pay an exorbitant price to have it done. For any construction process, though, it's best to hire a professional to do the job.
One of the most effective ways to keep sound from exiting a room is to add an extra layer of drywall to the walls or ceilings. Sound is less likely to move through a high-mass area than a low-mass area, and an extra layer of drywall gives the wall more mass. A 4-by-8-foot sheet of 5/8-inch-thick drywall can cost £6 to £9. Adding an absorbent mat between the wall and the extra drywall layer further ensures that less sound exits the room. A 2-by-4-foot soundproofing mat can cost £6 to £27 for the cheaper varieties, and much more for professional-style mats.
Objects such as light fixtures can easily transmit sounds to any upstairs rooms, but a false ceiling can solve this problem. Create the false ceiling by attaching furring channels to the existing ceiling and hanging drywall or wooden panels from them. The space between the new ceiling and the original ceiling is effective at trapping sound. A suspended wood ceiling can cost £3 to £14 per square foot, depending on the type.
There are several materials on the market that you can use to coat your walls and ceilings to reduce sound. These soundproofing liquids convert the energy in sound into heat energy. Applying these products to the false ceiling and the additional drywall gives an added layer of sound protection. Products such as Green Glue or Homasote typically cost £130 or less for a case that will coat an entire room.
The more insulation that a room has, the more likely it is to reduce the amount of sound that leaks out. Some musicians add extra fibreglass between the wall and the extra layer, or between the two ceilings. This insulation absorbs higher and midlevel frequencies, though lower frequencies are still likely to go through this insulation. A 33-square-foot roll of fibreglass may cost £15 to £19.