Soundproof Your Home: Window Inserts & The Basics

Soundproofing windows depends on how sound is coming into your home and what noise is disturbing you. Soundproof windows work against traffic noise, barking dogs, & noisy neighbors – and they do this with window insulation. Soundproofing window inserts provide inside window insulation that both reduces and absorbs sound. Find out if they'll work for you:

Simple soundproofing window tricks by blocking noise from entering.

Sound Reduction

shows graphically how reduction occur

Sound Absorption

shows graphically how absorption takes place inside an indow window

Types of Window Soundproofing

Sound Reduction — Decreasing noise from its original level by blocking it. Sound-reducing products prevent noise from entering a space.

Sound Absorption — Decreasing noise from its original level by stopping its movement within a space. Sound-absorbing products stop noise from bouncing off surfaces.

How to Increase Sound ReductionHow to Increase Sound Absorption
Seal gaps in window (caulk, weatherstrips) Add furniture
Sound-dampening curtains Hang acoustic panels
Install sound-reducing blinds Lay plush rugs
Install interior storm window inserts Purchase plants

Now that you know the difference, decide whether you need sound reducing or sound absorbing products.
Don't know which product you need? Noise generated outside calls for sound reducing products to stop noise from traveling through windows, ceilings, doors, and walls. Noise generated inside requires sound absorption products to reduce echo.

If outside noise is your issue, Indow is here for you. Noise travels via vibrations in the air and insulating, air sealing inserts block that noise from entering your space. Can't decide? You may need both.

Indow products can be used to block outside noise from entering while sound absorbing materials inside can minimize reverberation. Keep in mind, sound reducing products, like inserts, will provide a more noticeable difference in noise than sound absorbing products.

Learn more about the two types of soundproofing and soundproofing materials

Diagram of a soundproof window with original glass and acrylic acoustic insert.

How to Soundproof a Window with Inserts

Installing window inserts is an easy and effective way of soundproofing windows. Indow Acoustic Grade window inserts can reduce and cancel noise – up to 70% of outside noise when placed over single-pane windows and up to 50% of noise coming through double-pane windows. In an office or home, soundproofing windows is easy with our inserts that press into your existing window frame—no hassle, nails, or adhesives required. But how much does it cost to soundproof windows?

Woman installing Indow insert for the simple soundproofing in windows.

Indow inserts are edged with silicone compression tubing to create a seal for your soundproof window. Getting an exact fit is essential in soundproofing a window, since gaps and spaces allow sound to seep inside. This precise fit also creates a more comfortable, energy efficient space while the low profile practically disappears into your window frame. Our custom-made inserts offer simple soundproofing for any window shape.

Watch this 2 minute demo by window expert, The Craftsman Blog:

*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.

Sound Absorbing Treatments

Despite your best room soundproofing efforts, the sound that does penetrate can be absorbed once it's in the room to minimize reverberation. It's best to avoid minimalist style of exposed brick and wood floors. Consider hanging Acoustic panels. Also, plush rugs with sound dampening rug pads, wall hangings, upholstered furniture and plants will help absorb sound.

Indow Inserts Are Featured In:

Indow inserts are featured in: The New York Times, Wired, Popular Mechanics, Bloomberg, Treehugger, Sunset, This Old House, Dwell, KGW8

“Indow significantly improves insulation and leakage, as well as noise reduction.”

-RD Gentzler, Architect
House Beautiful, How to Soundproof Your Windows Without Actually Renovating

Customer Reviews


4.49 Average 1477 Reviews logo

Matthew L

Indow inserts were easy to measure, order and install. They've provided great insulation for old single-pane and stained glass windows in an antique home. We can significantly feel how much better the home holds heat.

Posted 2 days ago

Ellis W

I ordered two Indow inserts for my home. They are doing a great job, entirely happy with them and the ordering process.

Posted 1 week ago

Elizabeth W

I can't say enough good things about this product and company. Our house is 101 years old and the sidelites next to our front door are single pane ancient wavy glass which means when it gets very cold (Chicago temps) we can have an inch of frost covering the INSIDE of our windows. I was desperately searching for a solution so our front vestibule was not so cold and a friend recommended Indow. The process could not have been simpler and the temperature difference it has made is off the charts.

Posted 2 weeks ago

Austin T

I have several historic single pane gridwork mullion windows. They're beautiful but have almost no thermal protection. Indows proved to be the perfect solution to preserve these windows while getting the thermal comfort we need. They were easy to install and work perfectly!

Posted 3 weeks ago

Kathryn M

Amazingly easy to install even the safety chain holders. I. Noticed an immediate sound level difference and the room atmosphere became more solid feeling and pleasant. They also gave an insulating feature to the window drafts are non existent! The house is 50ft off a State highway that is heavily traveled in warmer months I'm confident the indows will handle it. I'm very pleased!

Posted 1 month ago


We ordered the acoustic inserts to help with road noise, and we've been sleeping so much better with them!

Posted 1 month ago

Sienna K

We used the windows inserts in our skylight. They are great! They the horrible drafts and noise out and were cost efficient. My only comment would be to provide better measurement and installation instructions for skylights specifically. It took us a lot of guessing and research to measure and install because skylight directions were not provided and the windows install guide doesn't always apply to skylights. Other than that though great product and I would buy again!

Posted 1 month ago

ted t

Our home was built in the late 1800s and we have spent a lot of money over the last 20+years restoring it.We did not want to replace the windows with modern windows because of the cost and originality. But the single pane windows come with a price also. the main reason we purchased the Indow window inserts is because of the condensation on the inside of the windows.We would literally have a take a towel and wipe them down every morning in the winter. There would be a puddle on the sill,and wood and water dont get along to well. SO we looked into the best solution to our problem and found Indow. Was reluctant to spend that much money but am super glad we did!! They have been installed now for over two months and our condensation problem has been virtually eliminated.!!! AND our furnace does not run as much as it did before. Over all it was money well spent!! The process was a little scary at first but they have a simple formula. And our contact person,Reed was awesome. Answered any questions i had and was always available.

Posted 1 month ago


Used to block interior side of a garden window in the the kitchen. Without insert, cold air literally poured into the kitchen making a winter jacket almost mandatory when preparing meals or washing dishes

Posted 1 month ago

Rob S

Highly recommend! The team (Brian) took time to help me figure out the best solution. They were made and delivered faster than expected. It was very rewarding to install them because I could feel the cold air get squeezed out as they went flush against the single pane of glass. Solid quality and great fit.

Posted 1 month ago

Alexa L

My inserts fit beautifully into my 125 year old windows - many of which were 5 feet tall. Easy to unwrap and install. Great product and even better service! I liked the process of measuring the windows with a laser measuring tool which was easy to use and precise. The product came in good condition after shipping across country and was well marked. The customer support was excellent.

Posted 1 month ago

Sarah D

Received our Indow Windows and can tell they are blocking a lot of the noise we could hear. Right now the weather is mild, but hoping to notice a big difference when the summer heats up. Our house is in a historic district and we cannot change our windows. They are very drafty and thin glass. We only ordered two, but we are in the process of ordering for four more. Love that we don’t need to drill holes or anything and they just pop right in.

Posted 1 month ago

Allan F

Every thing arrived in perfect condition, thanks to the very secure packaging. Windows fit as expected, although quite tight. After installation we noticed that the cold drafts were gone and the room felt a lot warmer. We are very satisfied with the product and the result.

Posted 1 month ago

Adriana W

Great customer service! Super satisfied with our windows.

Posted 1 month ago

Thomas M

Indow service and product is good. Reduced outside noise considerably.

Posted 2 months ago

Let Us Help You

bedroom with window with Indow inserts installed for soundproofing in San Francisco


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