Window Soundproofing Made Easy

Reduce outside noise whether it’s from trains, traffic or your neighbor’s barking dogs with our premium acoustic window inserts. Like other Indow® grades, Acoustic Grade inserts simply press inside your existing window frames. They seal out drafts and save energy like all Indow window inserts while blocking up to 70% of outside noise.*

Indow inserts don’t damage the existing window—nothing is bolted to the wall. This makes them a great choice for older homes with valuable historic windows, new homes, renters and others seeking noise reduction who don’t want to alter their original windows. At Indow, we make noise canceling easy without the hassle and expense of installing soundproof windows!

indow window insert acoustic

How Do Acoustic Window Inserts Work?

Acoustic Grade Indow inserts act as an extra wall against sound vibrations. The deeper the window frame, the bigger the air pocket between the acrylic insert and the window—and the better the performance. All windows are laser measured to ensure each custom Acoustic Grade insert has a precise fit. Our sound blocking window inserts create a tight seal, which is critical since noise also enters through the cracks.

indow window acoustic grade diagram

Indow’s custom Acoustic Window inserts are:

  • Nominal ¼” thick acrylic glazing, double the thickness of Standard Grade.
  • Edged in Indow’s patented silicone compression tubing.
  • Made in three different colors - warm white, brown and black.
  • Available in custom shapes like arches, rounds and eyebrows.

Window inserts for soundproofing are versatile and can be used in a variety of settings such as bedrooms, nurseries, home recording studios, workout/dance/art studios and offices. Establishments such as hotels, churches, yoga studios, government buildings and museums as well as rental property managers have all used Indow inserts to reduce outside noise. To better understand how sound enters a space, check out our home soundproofing guide.


Testimonials About Indow Window Inserts for Sound Reduction

Instead of relying on our word, read what our customers have to say about how our window inserts improved their lifestyle. For example, our client Maggie installed Acoustic Grade in several rooms to block loud traffic noise. The reduction was dramatic, and she loved how she couldn’t even see the inserts.

“It’s made a huge difference,” said Maggie. “Unless you know they’re there, you don’t know they’re there.” Read more case studies like Maggie’s on how we help customers find comfort, quiet and savings in their home or business.


How Indow’s Window Noise Reduction Performs:

  • Reduces noise by 18.9 dBA (a more than 70% reduction when placed over single-pane windows.)
  • Reduces noise by 10-12 dBA (a more than 50% reduction when placed over double-pane windows.)
  • STC (Sound Transmission Class) Ratings denote how much noise is blocked by walls, windows and other surfaces. Independent studies have shown Acoustic Grade inserts placed over a double-pane windows yield a STC rating of 42-45.
indow window acoustic grade chart

*We want to ensure our inserts help solve your noise problem. Overall noise reduction depends on the amount of noise coming through your walls, ceilings, floors, doors, and existing windows. Noise reduction will be less when placed over double-pane windows. Read our full Noise Reduction Sheet to learn more.


What Do They Cost?

Consider the cost and disruption of replacing your windows. A vinyl window averages $66-$87/sf. A wood window averages $71-$109/sf. With Indow inserts averaging between $27-$41/sf MSRP, your window project can cost a fraction of other options.


Standard Grade

indow windows cost for standard grade window insert is $27 per square foot

Our workhorse interior storm window insert blocks drafts and reduces outside noise.

Premium Grades

indow windows cost for premium grade window insert is $36 per square foot

Our 4 options in premium grade inserts provide superior protection against noise and light.

Commercial Grades

indow windows cost for commercial grade window insert is $41 per square foot

Industrial strength inserts with a scratch-resistant coating can be cleaned with common products.

If there’s a dealer near you, a dealer will laser measure your windows and also install the inserts. They will cover all costs in your estimate, which normally includes a measure and installation fee as well as your local sales tax.

Compare To Replacement Windows

Block noise to enjoy quiet and a good night’s sleep with our custom-made, sound reducing window inserts. Get a free estimate by filling out our form below.

Get A Free Estimate
bed in front of window that has Indow window insert




Grade Types

Each grade blocks drafts and reduces outside noise, but our premium grades have special features to make your existing windows work just right. Click here to read about all the different grades.