London is a wonderful city to live in, but it’s also a noisy one. Whether it’s constant traffic on the high street, the rumble of the Tube, or simply the hum of city life, noise pollution can make your home feel far less peaceful than it should. If you have original sash windows, you’ve probably noticed they let in more sound than you’d like. The good news is you don’t need to replace them to enjoy a quieter home. There are effective solutions for sash window noise reduction London homeowners trust. For expert advice on soundproofing your sash windows, speak to our team today. Call us on 020 8015 4201 to discuss your project.
Before you give up on peace and quiet, get professional advice. The right soundproofing solution can transform your home without compromising its character.
Why Are Sash Windows So Noisy?
Original sash windows are beautiful, but they weren’t designed with modern noise levels in mind. Single glazing, timber frames that have shrunk over time, and gaps around the sashes all allow sound to travel freely into your home.
The problem is often worse in period properties because the windows were built when London was a quieter place, before traffic, construction, and 24-hour city life became the norm. Sound enters through the glass itself, through gaps between the sash and the frame, and even through the box frame that houses the weights and pulleys.
Understanding the type of noise you are dealing with is the first step to solving it. For instance, persistent traffic rumble is a low-frequency issue best tackled with wide-cavity secondary glazing, while general street noise and voices are often addressed effectively with acoustic glass and draught proofing. If your windows rattle or whistle, that indicates physical gaps that must be sealed first.
The good news? Each of these entry points can be addressed without replacing your windows.
Your Options for Quieter Sash Windows
Secondary Glazing
Secondary glazing is one of the most effective solutions for reducing noise through sash windows. By adding a second pane of glass to the inside of your existing window, you create an air gap that acts as a powerful acoustic barrier.
The larger the gap between the original window and the secondary pane, the better the sound reduction. Unlike double glazing, which has a narrow sealed cavity, secondary glazing can create a much wider gap—which is excellent for blocking lower-frequency sounds like traffic rumble.
Benefits for noise reduction: Secondary glazing can significantly cut external noise, making it one of the most effective acoustic solutions for period properties. It also preserves your original windows completely and is fully reversible.
Best when: you want maximum acoustic benefit without replacing your original sash windows; you live on a main road, bus route, or near rail noise; you are in a listed building or conservation area; and your existing sash windows are otherwise worth keeping.
Acoustic Glazing
Acoustic glazing uses specially designed laminated glass to reduce sound transmission. The glass contains a layer of acoustic interlayer, a type of plastic that absorbs sound energy and prevents it from passing through.
When fitted as part of a double glazed unit, acoustic glass can dramatically reduce noise levels while also improving thermal performance. It’s an excellent option for homes where secondary glazing isn’t suitable or where you’re replacing sashes anyway.
Benefits for noise reduction: Acoustic glass is engineered specifically for soundproofing and can be combined with other measures for maximum effect. It also offers good thermal insulation.
Best for: properties where sash replacement is being considered, where secondary glazing isn’t practical, or for owners focused on reducing higher-frequency sounds like voices or general city ambience.
Professional Draught Proofing
Many homeowners overlook the simple fact that gaps and cracks let sound in just as effectively as glass does. Professional draught proofing involves sealing the gaps around the sash, between the frame and the wall, and around the box frame.
Quality draught proofing uses brush seals and rubber strips that allow the window to open and close smoothly while creating a tight seal against noise and draughts. It’s a relatively low-cost, high-impact improvement that works brilliantly alongside other solutions.
Benefits for noise reduction: Sealing gaps stops sound from bypassing the glass and frame altogether. It’s a cost-effective first step.
Best for: any property with original sash windows, particularly if you experience rattling, whistling, or noticeable draughts. This is often the first and most beneficial step in any soundproofing project.
comparing the solutions: secondary glazing vs acoustic glazing
Secondary glazing is generally the most effective solution for noise because it creates a large air gap. Acoustic glazing is also highly effective, particularly for higher-frequency sounds, but it involves replacing the glass (or the whole sash). If preserving your original windows is a priority, secondary glazing is the winner. If you’re already replacing sashes, acoustic double glazing is an excellent choice.
Combining Solutions for Maximum Effect
The most effective approach is often to combine solutions. Professional draught proofing plus secondary glazing can achieve significant noise reductions, making your home feel noticeably quieter. Some homeowners also add acoustic glass to their original sashes (where possible) and combine it with secondary glazing for the ultimate soundproofing package.
The Professional Advantage
Soundproofing sash windows is a specialist job. While DIY draught proofing kits exist, professional installation ensures that seals are fitted correctly, secondary glazing is measured precisely, and the overall result is as effective as possible.
A professional assessment will identify exactly where noise is entering your home and recommend the most cost-effective solution. This expert diagnosis is crucial, as it determines the specific frequency of the noise problem and matches it to the most effective solution, avoiding unnecessary work and cost.
What to Expect
Professional soundproofing can significantly reduce noise entering your home, often by a substantial margin. The exact improvement depends on the condition of your windows and the solutions used, but many homeowners describe the difference as transformative. Work is typically carried out with minimal disruption, and because secondary glazing and draught proofing don’t involve replacing your windows, there’s no impact on your home’s external appearance.
Reclaim Your Peace and Quiet
Living in London doesn’t mean living with noise. Whether it’s secondary glazing, acoustic glass, professional draught proofing, or a combination of solutions, there are effective ways to quieten your home without replacing your beautiful sash windows. The right approach depends on your property, your budget, and the type of noise you’re dealing with, but the result is always worth it: a calmer, more peaceful home where you can actually hear yourself think.
Ready to enjoy a quieter home? Call The London Sash Window Company today on 020 8015 4201 for a free consultation. Our soundproofing specialists will assess your windows and recommend the best solution for your home.
Frequently Asked Questions
Will secondary glazing reduce noise?
Yes, significantly. Secondary glazing creates an air gap between the existing window and the new pane, which acts as a highly effective acoustic barrier. It’s one of the best solutions for reducing external noise through sash windows.
What’s the difference between acoustic glass and double glazing?
Acoustic glass contains a special laminated interlayer that absorbs sound energy, making it more effective for noise reduction than standard double glazing. It can be fitted as part of a double glazed unit or used in secondary glazing.
Can I soundproof sash windows without replacing them?
Absolutely. Secondary glazing and professional draught proofing are both highly effective ways to reduce noise without replacing your original windows. They preserve the external appearance and are fully reversible.
How much does sash window soundproofing cost?
Costs vary depending on the solution and the size of your windows. Secondary glazing is generally more affordable than replacing windows, and draught proofing is a relatively low-cost upgrade that delivers excellent value.
Is secondary glazing suitable for listed buildings?
Yes, in most cases. Secondary glazing doesn’t alter the external appearance of the building, so it’s often the preferred solution for listed buildings and conservation areas. Always check with your local conservation officer.
How do I know which soundproofing solution is right for me?
A professional assessment is the best way to determine the right approach. A specialist can identify where noise is entering your home and recommend targeted solutions that deliver the best results for your budget.