How to Sound Proof Windows

Updated April 17, 2017

Soundproofing provides a barrier against unwanted noise. Whether you live next to a busy highway, have a musical band that likes to practice in the living room or simply require more privacy, soundproofing windows can be an effective solution. There are a number of different ways to soundproof windows.

Consider replacing the window with a vinyl framed double pane window. The vinyl frame is thought to reduce noise pollution up to 50 per cent and the double paned glass is thought to reduce noise pollution up to 20 per cent. This can be a costly choice depending upon the number of windows that need sound proofed.

Make a "removable plug" that will block sound and light from entering through the window but is removable during the daytime. A simple wooden frame, custom built to the specific window dimensions and filled with thick Styrofoam or furniture foam. The foam will absorb and lessen the sound coming in from outside.

Permanently seal a sound plug into the window frame using caulking glue. If the sound plug is effective and has no reason for removal, sealing the edges with caulking will improve the soundproofing quality.

Cover the outside of the window with a Plexiglas shutter or storm window. The shutter can be permanent or semi permanent but should cover the window exactly. The shutter can be screwed onto the outside frame of the window or hinged to one side so the existing window can be opened.

Reduce noise using soundproofing curtains that absorb noise that has come into the room and contain in. Heavy duty curtains don't actually stop noise but they do reduce it by muffling the sound. This is a cheap solution for those dealing with a small noise problem.

Take the time to check each window for cracks and holes through which sound can "leak" and fill with insulating foam, caulking or specially made soundproofing foam.

Look online for a cheap window soundproofing kit. There is a large range out here and choosing the one in your budget is essential. This is the costly way out of all the steps to soundproof a window and should be reserved for major noise pollution problems.


Any sound proofing technique should leave a space between the glass and the object in order for sound to be absorbed. The ideal distance would be between two and six inches.

Things You'll Need

  • Vinyl window
  • Foam
  • Caulking
  • Plexiglas
  • Screws
  • Hinges
  • Curtains
  • Kits
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About the Author

Trish Popovitch is a freelance writer with 10 years of professional writing experience and a degree in the social sciences. A former print journalist and current blogger and magazine writer, her content writing is a reflection of her varied background.