Silent Nights with Soundproof Window Inserts

Be it highway traffic, birds chirping, or boisterous neighbors, if the windows aren’t soundproof, external noise will inevitably interfere with your daily activities, mainly if it comes through while you are in the bedroom or your workspace. Employing soundproof window inserts is the most efficient technique to lessen the noise if you reside in an area where there is a lot of noise pollution, like blaring music from next door, screaming sirens, or screeching car horns. 

More excellent noise-reduction capabilities than single-pane windows are provided by the air space created between the window and the insert, which prevents the majority of sound vibrations from entering the glass. 

The best inserts are constructed of laminated glass, a thick glass made of two glass layers, and a plastic layer in the middle that efficiently muffles vibrations.

Continue reading to find out everything you need to know about soundproof window inserts, which are effective in helping you soundproof your room.

a woman installing soundproof window insert
source: Indow Windows

What are soundproof window inserts? 

They aren’t the replacement windows, to start with. Soundproof Window Inserts are placed in between your current windows and the shades, blinds, curtains, shutters, or drapes, a laminated glass window treatment is placed on the interior of the window opening. 

They are perfect for commercial and residential windows because they don’t alter the appearance of your house or office, and because they adhere to homeowner’s association rules.

Without untidy construction, we can create unique shapes and sizes and install them in a day or less. In general, soundproof window inserts are 50% less expensive than soundproof replacement windows.

Do Soundproof window inserts work?

A big, Yes! Soundproof window inserts are effective at reducing noise. Depending on the type, these inserts will either effectively suppress sound or not.

While other options like privacy grade can only block about 50% of the outside noise, commercial-grade and acoustic window inserts can successfully block close to 70% of the outside noise.

They also prevent UV radiation from breaking into your house, damaging your furnishings and carpets, and soundproofing.

Also Read: Acoustic Glass vs. Triple Glazing

How do Soundproofing Window Inserts Work?

Sound waves get absorbed, deflected/reflected, and canceled in the insulated sound trap produced by the air gap between the original window and the soundproof window insert. The amount of sound that enters the room through the trap as a result is significantly reduced. Additionally, the air gap cuts energy loss through windows by up to 60%.

Soundproof window inserts must be adequately sealed since sound can act like water and infiltrate through cracks. Please be aware that “soundproof” drapes or curtains frequently lack a seal surrounding them, enabling sound to pass freely through the edges.

Do Acrylic Window Inserts Work?

Acrylic is a type of plastic that is used in manufacturing Acrylic Window Inserts. 1/4″ thick acoustic-grade-acrylic that is double thickness grade inserts are used for soundproofing. Some companies also sell 1/8″ standard acrylic but that’s not very effective because mass per square foot increases with increase in thickness.

Comparing acrylic window inserts with laminated glass window inserts becomes very obvious when we talk of soundproofing. Laminated glass window inserts are made of three layers, two layers of glass with one layer of PVB sandwiched in between.

This PVB layer in laminated glass inserts helps in dissipating vibrations and pressure.

When compared to Acrylic, laminated glass with same thickness has more (almost double) mass per square foot. Hence, making it better for soundproofing than Acrylic window inserts.

The question arises, Why do companies manufacture Acrylic inserts?

Acrylic window inserts are easy to manufacture and the overall manufacturing cost if acrylic is way less than Laminated glass.

Pros of Acrylic window inserts

  • Cheap
  • Easy to manufacture
  • Lightweight

Cons of Acrylic window inserts

  • Not as effective as laminated glass
  • Prone to scratches
  • Gets dirty overtime

Do Window Inserts reduce traffic noise?

Yes! Window inserts help in reducing traffic noise. Indow windows claim that their soundproof window inserts can reduce traffic noise by upto 50% when placed over single pane windows.

Best Soundproof Window Inserts

I recommend purchasing Indow Window Inserts if you’re facing a lot of noise through the windows. Indow window inserts are the best option because of the following reasons:

  • They are effective
  • You’ll get tons of customization options for your window.
  • They have great customer reviews.
  • Easy to Install.

Please purchase them only through their official website if you want to take advantage of customization options.

These inserts(every single grade) reduce noise by upto 50% when placed over single pane window, the indow Acoustic Grade Window inserts reduce sound by up to 70%. These inserts would cost you around $30 per square foot and for the whole window the price would be around $300-$400.

You may find this expensive but trust me it’s an investment. Compared to replacing the window and all the installation these window inserts offer comparable results and they are a lot less cheaper.

Soundproof Window Inserts Test (Indow Windows)

I found this really cool video on a YouTube channel named “Soundproof Guide,” where they tested a soundproof window insert from Indow Windows. So, you can say it is basically a review of window soundproofing insert.

Indow windows is a great option if you’re looking for a customized soundproof window insert, you just need to deposit a token money for ordering the kit and then the company will send you a measuring kit along with instructional guide and you will have to take measurements and send the kit back to the company with your window’s measurements.

Once they get the kit back, your token money will be refunded. After this, it would take some time (more than a month) for them to design your insert.

LayerWindows OpenWindows Open + Indow InsertWindows Closed + Indow Insert
Noise in dB60 db47 db37 db
Source: Soundproof Guide

So, it can be clearly seen from the results that soundproof window inserts do really work. You can notice quite a significant change in noise with the insert installed. 

One thing to keep in mind is that the windows used in this review might be completely different (glass, thickness, etc) from the windows at your house.

So before purchasing the window insert you may want to fix other sound issues with your windows like filling the cracks, changing the window’s glass etc. to make it more capable of blocking sound.

Note: Indow Window Insert reduced the noise by 38.33 percent with the windows closed.

Advantages of Soundproof window inserts

Its outstanding noise-reduction qualities have previously been mentioned. Thus there is no need for additional justification. There are also a few other advantages of window inserts.

  • Blocks Ultraviolet Light: In addition to blocking sound waves, soundproof window inserts shield us from the sun’s damaging UV rays. These inserts help mitigate the damaging effects of ultraviolet radiation, which are frequently caused by prolonged exposure, which can damage carpets and furnishings.
  • Energy Conservation: By improving the effectiveness of air conditioners and heaters, these inserts, which act as a layer of window blockade, also help conserve energy. They aid in controlling the temperature inside.
  • Maintain the Look of Windows: Window inserts are frequently mistaken for big sheets of metal-like substance that are used to keep noise out of homes. That is untrue, though, as the new, contemporary window inserts are hardly noticeable. They are challenging to see at first glance and allow you to keep the status of your windows.
  • Cut back on draughts and allergens: By preventing allergens and draughts from entering your home, as was already said, they help keep it cleaner and more hygienic—this aids in resolving issues caused by the entry of pollen, dust, and insects.
Live testing Indow Window Inserts

How much do Soundproof Window Inserts Cost?

The sense of silence is expensive!

The shape and size of the window have a significant impact on the price of soundproof window inserts. Window inserts for the typical home might cost anywhere from $22 to $48 per square foot.
In comparison, Vinyl Window costs around $66-$87/sf and wood windows costs on average $71-$89/sf.

Arched window inserts are around 15% more expensive than normal ones because the price also relies on the shape. It is because its production and installation are a little more complex than regular rectangular ones.

If you order customized Soundproofing windows, the price can go as high as $10,000 per window, not including installation.

For Indow window inserts too, the price depends on the shape and size of the window and the grade type of the chosen insert. For most of them, the price ranges between $31/sf to $40/sf. Furthermore, the commercial grade acoustics from Indow Window costs $49/sf.

Spend considerably more money if you want to drown out annoying but infrequent sounds like thunder or ambulance sirens.

different grades of window inserts
source: Indow Windows

How can I Soundproof my windows without replacing them?

Well, I would be honest. It’s nearly impossible to “soundproof” a window without replacing the regular glass. You can definitely use window inserts, apply weatherstripping, hang soundproof curtains etc. and it will definitely reduce the noise by a significant amount.

But I’m afraid if you’re a professional musician or you’re trying to build a home studio. I understand how a silly sound can completely interrupt your work. So, I recommend taking professional advice on soundproofing your windows.

Types Soundproof window inserts

1.      Acoustic Grade Inserts

The best inserts for reducing outside noise are those with an acoustic grade. Whether it is the sound of a train, a car, or the howling dogs of your neighbor, they can effectively block noises up to 70%.

These window inserts press tightly against the window frame to block draughts and are easy to install.

Most essential, they complete the task without harming the window. They are, therefore, the preferable option for homeowners who own both new construction and rental properties.

An additional layer or barricade that blocks the entry of sound vibrations is an acoustically soundproof window insert. They provide the same function as soundproof storm windows

As discussed earlier, the size of the sound trap determines how good acoustic window inserts operate; therefore, the deeper the window frame, the better.

These inserts seal the windows tightly to prevent allergens, draught, and noise. Simply said, they capture the sounds in the sound traps and traps, absorb, decrease, and dampen them.

2.      Standard Grade Inserts

Standard grade window inserts are the next. They are clever and reasonably priced window inserts to keep noise and draught out of your house. Their addition improves your windows’ ability to block out noise and transforms them into double-insulated windows.

These inserts are practically undetectable because they blend perfectly with the window frames. Standard grade soundproof inserts for windows are best if you want a quick, simple, and affordable choice. 

These inserts come in a wide range of sizes and can be specially made to meet your unique design requirements.

This enables you to add a functional soundproofing barricade to your window without sacrificing its aesthetic appeal. These inserts are made to fit your window frame properly and are invisible from the outside.

These inserts are kept in place by a compressive force that forms an airtight seal and stops entering noise, dust, draughts, and allergies.

3.      Museum Grade Window Inserts

Museum-grade soundproof inserts for windows are also ideal for shielding your house from UV rays. This shields the flooring, furniture, and artwork from damage brought on by the sun’s harmful rays.

These inserts can collectively block up to 98 percent of damaging UV light. They blend perfectly with the window’s frame, just like other window inserts. UV light protection is a consideration in the design of museum-grade window inserts.

types of soundproof window inserts
window insert grades

4.      Privacy Grade Window Inserts

Privacy-grade soundproof inserts for windows are multipurpose inserts that transmit light while obstructing the view. They are made of premium, translucent acrylic

These soundproofing window inserts have numerous uses around the house and were created to assist you in achieving the best level of privacy in your home.

These inserts create the ideal seal to separate the inside from the outside using silicone compression tubing. They aid in making a quiet and pleasant house by blocking up to 50% of outside noise and providing privacy.

5.      Commercial Grade Window Inserts

Commercial-grade soundproofing inserts for windows are the most acceptable option if you’re looking for high-end durability. They assist you in energy conservation while providing sound and UV protection and insulation. 

Commercial-grade soundproof inserts for a window can assist you in creating the ideal workspace needed to boost productivity at work.

These inserts have a more rigid shell than other insert types and are scratch-resistant. These were made to last and can withstand the test of time

Their uses aren’t limited to professional settings; if you’re looking for a long-lasting solution, you can use them at home.

Commercial-grade window inserts have the best sound-blocking properties available and may effectively silence up to 70% of outside noise

As a result, it’s the ideal soundproofing option for insulating your house from intrusive noises from the outside.

How to Assess Your Need for Soundproof Windows?

Possibly not! The annoying noise may be coming from your chimney or attic vents. Or perhaps chilled air and noise are coming from leaks around your windows.

Anyone who despises noise should speak with an acoustical professional before spending money to solve the issue. 

You can consult a professional who will assess the nature and volume of the noise you wish to get rid of and recommend the most effective soundproofing measures.


Installing the window inserts in front of a single-pane window will provide more noise-reducing benefits than doing the same with a double-pane window. This is because a double-pane window’s STC is frequently more, to begin with, and thus an insert won’t significantly raise its overall STC. 

An insert costs typically between $350 to $800 fitted for one window, which is less expensive or on par with the price of the next soundproofing window option: a window replacement.


  1. How do you soundproof an existing window?
    You can install window inserts to your existing windows or you can use soundproof curtains, blankets, fix the cracks by using caulk, or attach a foam mat to your windows.
  2. Why can I hear so much through my windows?
    This is because your windows are not soundproof, that is they are not designed to block noises from outside. Also, there may be holes or cracks around the windows that are allowing the noise to come in.
  3. How much does soundproof glass cost?
    However, it depends on the brand and the quality of the glass, on average, it costs around $250 to $1600 to install glass over one window.