How to Soundproof Windows: 7 Options for Every Budget and Noise Level

You’d never put up with a neighbor walking into your living room uninvited, so why let their leaf blower do it? For many homeowners, windows are open doors for noise. The hum of traffic, barking dogs, random yelling at 2 AM—it all slips through the glass. Over time, that background noise doesn’t just mess with your mood. It wears you down. However, soundproofing your windows can change that almost immediately. It’s not just about peace. It’s about making your home feel more like, well, your home. Let’s walk through seven ways to soundproof your windows so you can make that happen. 

Why Should I Soundproof My Windows?

If outside noise creeps into your home, it can mess with your sleep, focus, and sense of personal space. Soundproofing your windows reduces noise pollution and makes your space feel noticeably calmer. It’s an easy solution for homeowners who want deeper rest and fewer distractions. You’ll also notice fewer sound leaks—both in and out—which makes for better privacy. Plus, certain upgrades pull double duty (help with temperature control) by boosting insulation and lowering your energy bills.

How Much Does It Cost to Soundproof Windows?

The cost to soundproof your windows averages around $900 per window, but size, method, and materials can push that higher—around $1,200 or more for large or custom windows. DIY options like acoustic caulk or foam inserts can start as low as $25 per window, while mid-range solutions (e.g. window inserts) run between $250 and $500. Now, full window replacements come with high price tags that can climb past $2,000 with installation. The more windows you soundproof, the more it adds up, and local labor rates and permit requirements can bump the total, too.

How to Soundproof Windows

Noise has a sneaky way of finding the smallest gaps and weakest materials, and windows are often the easiest target. You’ll find that plenty of window soundproofing methods double as insulation, which means more peace and better energy efficiency in one go. With a free hour and a little patience, some of these fixes are DIY-friendly. Others might be worth handing off to the pros if you want long-term results.

Apply Acoustic Caulk

If you want to block outside noise without replacing your windows, acoustic caulk is an easy and affordable first step. It targets those hidden gaps around your window frame that let sound leak in. Unlike regular caulk, which can crack over time, acoustic caulk stays flexible and forms an airtight seal that helps prevent noise from sneaking through.

Caulking your windows is simple enough for you to tackle it yourself—all you need is the acoustic caulk, a caulk gun, and some basic supplies. Clean the area around the frame, apply the caulk in the gaps, and smooth it out. Let it fully dry (at least 24 hours).

Hang Soundproof Curtains

Made from dense fabrics, like velvet or layered materials, soundproof curtains absorb sound and reduce its reflection off windows. Their thickness blocks higher-frequency sounds, like voices, but they won’t eliminate all noise. Still, soundproof curtains make a noticeable difference.

Hanging them is relatively easy. First, measure your window and decide how far beyond the frame the curtains should extend. It’ll block more sound the further it extends. Then, install a curtain rod with mounting brackets—ideally into wall studs for extra support. Once the rod is in place, hang the curtains, ensuring they’re wide enough to create folds and long enough to cover the entire window. For the best results, don’t choose just any curtain. Choose curtains specifically labeled for soundproofing.

Use Window Inserts

Window inserts are custom-made acrylic or glass panels that fit inside your existing window frame. By creating an additional air gap between the insert and your original window, they block sound waves—much like double-pane windows do. They also improve insulation, helping you save a few extra dollars on your energy bill.

While some basic DIY window inserts are available, you should consider hiring a professional. Accurate measurements are the most important factor when soundproofing with window inserts. However, if you’re comfortable doing it yourself, start by measuring your windows. Once you have your measurements, you can order your custom-made inserts from a supplier or online store—many of which offer a variety of materials and thicknesses. Remember, thicker material means better soundproofing.

When your inserts arrive, place them inside the window frame. Some inserts are designed for easy drop-in installation, so all you need to do is secure them in place using compression seals or a similar method. After installation, check for gaps around the edges and adjust the positioning if needed. 

(Re)Glaze Your Windows

Glazing windows is usually a weather-proofing solution, but it also has soundproofing benefits, particularly around the edges. By reapplying or replacing the putty that holds the glass, you seal gaps where sound can leak through; however, this won’t stop the sound that comes through the glass itself. 

To glaze your windows, start by removing any old glazing and cleaning the frame thoroughly. Apply a new glazing compound to the edges, pressing it into place with a putty knife. Insert the glass,  secure it with glazing points, and smooth the compound for a neat, sealed finish. Just keep in mind that while it helps with sound, glazing alone won’t provide substantial soundproofing. So, it’s often combined with other methods on this list for better results.

Use Window Foam Plugs or Seals

Window foam plugs are inexpensive, easy-to-install foam strips that fill the gaps in your window frame to keep sound from slipping through. They’re especially helpful in older windows with worn-out seals. If your window sees a lot of action, consider skipping the foam plugs because they'll block how your window works. Alternatively, foam plugs are great for windows that rarely open, as they’ll help create a solid, soundproof barrier.

First, find any gaps where sound is sneaking in. Measure the size of the gaps, then pick the seal—your options include adhesive foam strips, wedge plugs, or compressible seals. This is a DIY-friendly project that doesn't require special tools or expertise. Simply press the foam into place for temporary or semi-permanent soundproofing. Check for any missed spots.

Install Exterior Storm Windows

Storm windows are secondary windows that create an additional air gap between the storm window and your existing window. They block out noise and can protect your main windows from the elements. Homeowners can try their hand at installing storm windows if—and only if—they’re comfortable with basic carpentry and working at heights. 

Start by measuring your window frames and buying the right-sized storm windows. Clean the frame, position the storm window, and mark pilot holes for installation. Secure the window with screws, and seal around the edges to improve soundproofing. If you’re dealing with large or hard-to-reach windows, hiring a professional is worth it for a safe and effective installation.

Upgrade to Double or Triple-Pane Windows

Swapping out single-pane windows for double or triple-pane models is one of the best ways to cut down on noise, especially in noisy neighborhoods or near busy streets. These windows layer multiple panes of glass—with air or gas in between—to block sound vibrations. The thicker glass and insulating gap make it harder for sound waves to pass through. And if you want even more noise reduction, laminated or acoustic glass can take it to the next level.

While these windows are a bit of an investment, the benefits extend beyond quieting your space. Double or triple-pane windows also boost energy efficiency, reduce condensation, and increase your home’s value. Just know that replacing windows isn’t a DIY job. It requires experience and specialized tools. A professional installation guarantees a job well done and prevents issues such as leaks or poor soundproofing. Call your local window professional if you want to invest in the comfort and long-term value of your home.

Tips for Installing and Maintaining Your Soundproofed Windows

There’s no single fix that blocks out every sound. Successful window soundproofing is about layering innovative solutions. From sealing gaps to placing your soundproofing materials where they’ll actually make a difference, it’s the combination, installation, and upkeep that makes the silence stick.

• Combine several soundproofing methods—like window inserts, heavy curtains, and sealing—instead of relying on just one.

• Replace or reinforce window seals twice a year, especially after a hot summer or freezing winter, when materials tend to shift or crack.

• Match your soundproofing to the type of noise—some materials block out low-frequency noises (deep rumbles), while others stop high-frequency noises (sharp sounds).

• Add soft, sound-absorbing elements like curtains, panels, or even a thick rug near windows to absorb echoes that would otherwise bounce around your walls.

• Soundproof all the windows in your space, not just the loudest one.

• Test your work after each fix by listening for sounds and checking for air leaks.

• Keep your windows functional. Make sure your soundproofing doesn’t block how the window opens.

DIY Soundproofing  vs. Hiring a Pro

If you’re staring down noisy windows and debating whether to tackle it yourself or call in the pros, here’s what you need to know.

DIY soundproofing can definitely help, especially if you’re on a budget or just trying to reduce mild noise. Acoustic caulk runs about $5 to $15 a tube. Thick, soundproof curtains can set you back anywhere from $20 to $400 per window, and window film typically ranges from $20 to $100. If you’re sealing up cracks, adding dense curtains, or applying film to a few windows, you’re likely looking at a total cost between $100 and $500, which isn’t bad for a weekend project that could save you peace of mind and money on your bills.

When it comes to serious upgrades—like window inserts, storm windows, or replacing single-pane glass with double or triple-pane units—that’s when you bring in the professionals. These jobs require precision, proper sealing, and, in some cases, heavy lifting and glass handling that isn’t safe (or smart) to DIY. Professional soundproofing can cost anywhere from $300 to $1,500 per window, depending on what you’re doing. On average, window inserts cost between $250 and $500 (installed), and full window replacements cost even more—$350 to $850 for double-pane and $400 to $3,450 for triple-pane glass. 

Hire a professional for anything requiring ladders, custom fitting, or sealing heavy panes. For replacements, start with your local window installation companies. For more specialized soundproofing, look for local soundproofing contractors with experience in acoustics.