How To Soundproof Windows without Replacing: Noise Cancelling Windows Solutions

Are you constantly disturbed by the noise from the bustling streets or the neighbor’s loud music but don’t want to undergo the hassle and expense of replacing your windows? You’re in the right place.

Soundproof Windows Without Replacing Them

Soundproofing windows without having to replace them is not only possible but can also be economical and effective.

In this guide, we’ll walk you through methods that won’t block the natural light and will transform your living space into a peaceful sanctuary. Dive in to discover how you can achieve tranquility without breaking the bank or compromising on aesthetics.

Common Challenges in Window Soundproofing

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You first need to know what issues you are dealing with when you’re trying to soundproof windows.

Your existing window is the weakest link which allows exterior noise into your home. All your time, effort, and money that you spend while soundproofing a house or just a room will go to waste if you don’t do anything about the windows.

Windows, while essential for light and ventilation, often become the weakest link in our quest for a quieter home. Their design and materials present unique challenges in the realm of soundproofing.

The Nature of Sound Waves

Sound waves are essentially vibrations that travel through the air. When these waves hit a barrier, like a wall or a window, some get reflected, some get absorbed, and some pass through.

Windows, due to their construction and material, often allow more of these waves to pass through, leading to noise disturbances.

Sound Leaks: The Silent Culprits

Traffic noise and the neighbor’s dog barking causing sleepless nights? The most probable culprit is that door or window that is leaking sound into your house.

Here are the issues that cause sound leaks:

  • Gaps and Crevices: Even the tiniest openings in or around a window frame can be a gateway for external noise. Whether it’s the chatter from the street or the honking of cars, these gaps can significantly diminish your home’s tranquility.

  • Weathering and Age: As windows age, their seals can deteriorate, and frames might warp. This natural wear and tear can lead to increased gaps and, consequently, more noise intrusion.

The Limitations of Window Design

The Limitations of Window Design

Unlike walls, doors and windows do not have that much mass to block sound from entering or leaving.

Mass is a critical element in soundproofing. Drywall and MDF have a lot of mass and are thus, more effective in noise reduction. Windows are just the opposite because they are too light for the job.

Another issue is the glass itself which tends to vibrate. This is most noticeable when playing loud music in the room. However, this will not be an issue if you don’t watch movies or listen to music at high volume unless you live close to an airport with low-flying aircraft passing over your house.

Listed below are the limitations imposed by window design:

  • Material Choices: Most windows are made of glass, a material that, by its very nature, isn’t the best at blocking sound. The type and thickness of the glass can play a significant role in its soundproofing capabilities.

  • Single vs. Double Pane: Single-pane windows offer minimal resistance to sound. In contrast, double-pane windows (also known as double-glazed windows), with an air gap in between, can provide better sound insulation. However, even they have their limits.

  • Vibrations and Resonance: Windows can resonate or vibrate when subjected to specific sound frequencies. This not only allows noise to enter but can sometimes amplify it, especially if the window material resonates at the same frequency as the external noise.

External Factors Compounding the Problem

  • Location Challenges: If your home is near a busy road, train track, airport, or industrial area, the external noise levels can be significantly higher, making soundproofing even more challenging.

  • Climatic Factors: Rain pelting against the window or strong winds can create additional noise challenges. While these are sporadic, they can still disrupt the peace within your home.

The Misconception of Complete Silence

It’s essential to set realistic expectations. While various soundproofing methods can drastically reduce noise intrusion, achieving complete silence is nearly impossible. The goal is to minimize disturbances to a comfortable level, allowing you to relax and enjoy your space.

How to Soundproof Windows Without Replacing Them

You may have heard of solutions like replacing the existing windows of your house with thick, double layered windows. But that is not what you want or else you would not be reading this post.

Most homeowners would not prefer this solution owing to the expenses involved. This is neither an option for those living in rented apartments. Hence, soundproofing windows without replacing them is the best way.

Before we go into the methods, I’d like you to check out all my window soundproofing solutions (including replacement).

1. Seal the gaps

Seal the gaps with acoustic sealant

As brought out earlier, the gaps, cracks, and crevices around your window frames will cause sound to leak directly into your house. The first and most important step is to seal these. Gaps are mostly found on the edges where the windows come in contact with the walls.

There are a few ways for sealing these like expandable foam and conventional caulk. However, expandable foam can be a bit messy while conventional caulk is prone to cracks in the long run.

The best solution for the task is an acoustic sealant (see it on Amazon). Acoustic sealants are fairly good at blocking sound and will last for several years. Decent acoustic sealants would cost $20-30 for a 28-ounce tube.

2. Create A Window Plug

window plug

In simple terms, a window plug is something which you can create to “plug” into the window from the inside to block sound from entering or leaving the room.

The window plug is detachable, which means that it can be removed whenever you want to use the window to let in light and fresh air.

A window plug can be constructed in 7 easy steps.

Step 1

Measure the depth of the window sill in order to determine the maximum depth of your window plug. For example, if your window sill depth is six inches, you will want your plug’s depth to be about four inches.

Step 2

Measure the length and breadth of the gap in which the window plug would fit in. The plug will have to snugly fit in, so you need to be as accurate as possible.

Step 3

Build a frame that matches the exact dimensions of your window plug. Make a cross support to strengthen the frame. Use 1x4s or 1x2s, depending on the depth of your sill or any other material to make the frame. Just make sure that it fits in and sits on the window sill. If it snugly fits in, be assured it will not fall out.

window plug installation guide

Measure the dimensions of the gap in the window.

frame for window plug

The frame is built. This will be filled with insulation and closed with two sheets of MDF on either side.

Step 4

You will need two half-inch MDF sheets of 1/2 inch thickness. The MDF sheets will cover the frame to form a box. Cut the sheets to size and attach one of them.

Step 5

Add insulation inside the open box. The insulation must be of low-density fluffy fiberglass which is ideal for soundproofing. Seal the box with the other sheet of MDF when done.

Step 6

Glue a thin layer of felt tape on along the periphery of the frame. This will help in the snug fitting of the window plug and will also avoid scrapes on the window sill.

Step 7

Attach two handles on the front of the side of the window plug so that you can easily mount and remove the plug.

How Is This Effective At Soundproofing Your Window?

  • The MDF box will have a significant mass that will help in blocking sound.

  • The insulation will help in the dissipation of sound energy.

  • The gap between the plug and the window will isolate the two which will be beneficial for soundproofing.

  • The reduction of external noise will be significant but not 100%. This is true in the case of using expensive materials as well.

What More You Can Do?

  • Attach latch locks for added security especially if you have children in the house.

  • You can fix window blinds so that from the outside, the plug is not visible.

  • You can enhance the effectiveness of the soundproofing by adding MDF layers with a noise damping compound like Green Glue.

3. Add Window Inserts

A soundproof window insert

Window inserts are secondary window panes made from acrylic or laminated glass that can be installed on the interior side of existing windows. They’re designed to fit snugly inside the window frame, creating an air pocket that acts as an insulator.


  • Noise Reduction: The added layer and the trapped air between the primary window and the insert effectively reduce noise penetration.

  • Energy Efficiency: They can also help in insulating the room, leading to energy savings.

  • Easy Installation: Most window inserts can be installed without professional help and are removable.


  • Cost: High-quality inserts can be relatively expensive.

  • Aesthetics: While they’re designed to be unobtrusive, some people might not like the idea of an additional layer on their windows.

4. Soundproof Curtains

soundproof curtain

Soundproof curtains are thick, dense curtains made from specially designed materials to absorb and block out sound.


  • Versatility: Available in various designs and colors, they can enhance room aesthetics while providing soundproofing.

  • Ease of Use: Just like regular curtains, they can be drawn or pulled back as needed.

  • Additional Insulation: Apart from sound, they can also block out light and cold, adding to room comfort.


  • Partial Soundproofing: While they reduce noise, they might not be as effective in soundproofing the entire window as other dedicated methods.

5. Mass Loaded Vinyl (MLV)

mass loaded vinyl (MLV)

MLV is a flexible, dense material loaded with non-toxic metals, making it a heavyweight soundproofing solution despite its thinness.


  • Versatility: Can be used on walls, ceilings, floors, and around windows.

  • Effective Sound Barrier: Especially good at blocking out low-frequency noises.

  • Easy Installation: Can be cut to size and attached using nails, screws, or adhesive.


  • Aesthetics: MLV isn’t the most visually appealing, so it’s often hidden behind other materials or decorations.

  • Cost: High-quality MLV can be on the pricier side.

6. Add Acoustic Panels

Acoustic Panels over a window to soundproof it

Acoustic panels are sound-absorbing materials that reduce echo and reverberation in a room. They’re often made from foam, fabric, or other porous materials.


  • Sound Quality: Apart from reducing noise intrusion, they can enhance the internal acoustics of a room.

  • Variety: Available in various sizes, colors, and designs, allowing for creative room aesthetics.

  • Easy Installation: Can be mounted on walls, ceilings, or placed as standalone units.


  • Space: They can take up wall or floor space, which might not be ideal for smaller rooms.

  • Dust Accumulation: Some materials, especially foam, can attract dust, requiring regular cleaning.

7. Window Treatments

Noise Reducing Blinds

Blinds and window treatments aren’t just for privacy and light control; they can also play a role in soundproofing.

While traditional blinds might not be designed with soundproofing in mind, there are specialized options and techniques that can enhance their noise-reducing capabilities.

Types of Blinds for Soundproofing Windows

  • Cellular Shades: These are made of a honeycomb design that traps air, providing insulation. The trapped air acts as a barrier for both temperature and sound, making them a popular choice for those looking to reduce noise infiltration.

  • Vertical Blinds: Made of thicker materials, these blinds can help dampen external noises, especially when fully closed. Their overlapping design offers an added layer of sound protection.

  • Roller Blinds: These blinds, especially when made of dense materials, can act as a sound barrier. Opt for blackout roller blinds for added thickness and soundproofing benefits.

Additional Window Treatments:

  • Window Valances and Cornices: While they might not directly contribute to soundproofing, they can help seal the top of window treatments, preventing sound leaks.

  • Window Films: These thin layers can be added to the window glass to dampen vibrations and reduce noise transmission.

Additional Tips for Enhanced Soundproof Windows

Here are some additional tips to soundproof windows without replacement.

  • Layering: Combining multiple methods, like using MLV along with soundproof curtains, can offer enhanced soundproofing.

  • Regular Maintenance: Ensure that all your soundproofing additions, be it seals, curtains, or inserts, are regularly checked and maintained for optimal performance.

  • Professional Consultation: If you’re unsure about the best approach for your specific situation, consider consulting with a soundproofing expert.

Final Thoughts

Soundproofing windows without replacement is definitely possible within a reasonable budget as long as it is approached correctly.

Sealing the gaps and adding mass is the key. For the average person, the method brought out in this post is fairly effective.


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