Unit 1, 49 Clifton Road

Aylestone, Leicester LE2 8AA

Mon - Thu: 08:30 - 17:30

Fri: 08:30 - 16:00. Sat & Sun: Closed

0116 456 0242

Book a free home visit!

Expert Double Glazing Advice

How Effective is Double Glazing at Reducing Noise?

House with soundproof double glazed windows to reduce noise

Noise Reducing Glass | Noise Reduction Windows

Double glazing, a popular choice for homeowners in the UK, offers numerous benefits to windows such as improved insulation, energy efficiency, and enhanced security. But can double glazing reduce outside noise? Let’s explore this question further.

Can Double Glazing Reduce Outside Noise?

Yes, double glazing can help reduce outside noise to a certain extent. Double glazing refers to the use of two glass panes with a layer of insulating air or gas in between. This construction provides better sound insulation compared to single glazing, which consists of a single glass pane.

The air or gas trapped between the two glass panes acts as a barrier to sound transmission, reducing the amount of noise that enters your home or building. The additional layer of glass helps to dampen sound waves and prevent them from passing through easily.

However, it’s important to note that while double glazing can help reduce outside noise, it may not completely eliminate it. 

The level of noise reduction achieved depends on various factors such as the thickness of the glass, the gap between the panes, the type of gas used for insulation, and the overall quality of the insulated glazing installation.

Related Double Glazing Articles:

How Does Double Glazing Reduce Noise?

Double glazing is renowned for its ability to provide excellent sound insulation. This solution consists of two glass panes with an insulating layer of air or gas trapped between them. The combination of multiple glass layers and an insulating medium work together to reduce the transmission of sound waves.

  • Multiple Glass Layers: The primary reason behind the effectiveness of double glazing is the presence of multiple glass layers. These layers act as a barrier that absorbs and reflects sound waves, preventing them from entering your living space.
  • Insulating Medium: The air or gas trapped between the glass panes in double glazing units acts as an additional soundproofing layer. This medium disrupts the path of sound waves, reducing their intensity as they pass through the window.

Does Double Glazing Stop Outside Noise?

While double glazing can indeed help reduce outside noise, it’s important to note that the level of noise reduction may vary depending on several factors. The thickness of the glass, the size of the air or gas gap between the panes, and the specific sound frequencies can all affect the effectiveness of noise reduction.

To maximise noise reduction, it is recommended to opt for thicker glass panes and a larger air or gas gap. These features can provide better sound insulation, helping to minimise the transmission of external noises into the interior space.

It’s worth mentioning that while double glazing can significantly reduce high-frequency noises such as traffic or general street sounds, it may be less effective against low-frequency noises like heavy machinery or aeroplanes. These low-frequency sounds can travel through the structure of the building itself, rather than solely through the windows.

To further enhance noise reduction, homeowners can consider additional measures such as installing acoustic seals or opting for laminated glass, which has a higher sound insulation rating.

Additionally, factors like the design and quality of window frames, the presence of gaps or leaks around the window seals, and the overall installation quality can also affect the effectiveness of noise reduction. 

Therefore, it’s crucial to ensure proper installation by hiring a professional double glazing installer, such as Phair Windows & Glass.

If you’d some more information about soundproofing or replacing your windows, contact us for a free, no-obligation quote.

How Much Does Double Glazing Reduce Noise By?

Double glazing effectively minimises external noise as it utilises two glass panes with a layer of gas between them to absorb sound vibrations and reduce sound transmission. 

High-quality double glazing can reduce sound levels by an impressive 20-65%, offering a significant reduction of up to 35 decibels. The exceptional sealing of uPVC frames further contributes to dampening noise vibrations, ensuring a quieter and more peaceful living environment.

What is a Decibel and How is it Measured?

Decibels (dB) serve as a measurement of sound intensity, reflecting the volume level of sound. Sound, being a vibration that travels through air and solid objects, appears in the form of waves known as ‘soundwaves’ with various wavelengths.

Notably, the decibel scale is logarithmic, implying that every 10dB increase signifies a ten-fold rise in volume. 

For instance, a sound of 20dB is ten times louder than 10dB, while 100dB is a billion times louder than 10dB. Therefore, even slight increments in sound can have a potentially damaging effect on our hearing.

Sounds can fall within the range of 0 to 140dB, with the average household having a noise level of around 40dB. Very quiet sounds are those below 30dB, while noise levels surpassing 85dB are considered potentially harmful.

Here are some examples of common sounds and their dB levels:

  • Breathing: 10dB
  • Whispering: 20dB-30dB
  • Conversation: Between 40dB and 60dB
  • Cars: Approximately 70dB
  • Emergency Vehicle sirens: 110-120dB
  • Chainsaw: Around 140dB

Being aware of these noise levels is crucial as exposure to loud sounds, especially for prolonged periods, can cause hearing damage. Fortunately, double glazing can reduce noise pollution by up to 35 decibels, offering an effective solution to create a quieter and more comfortable environment.

Double glazing window with high noise levels

How Can Double Glazing Help Reduce Noise Levels?

Selecting the right windows is crucial for effective noise reduction in your home. Large surfaces of glass panes can allow sound to penetrate, and older or poorly fitted frames may have gaps that permit noise intrusion.

Double glazing plays a vital role in reducing noise as it absorbs sound vibrations within the gas layer between the glass panes. Opting for high-quality double glazing can lead to significant sound reduction, ranging from 20% to 65%, potentially reducing noise levels by 35 dB.

New double glazing comes with a rating, denoted as RW (Weighted Sound Reduction Index), indicating the level of sound insulation it provides. The higher the RW rating, the better the sound insulation you’ll experience.

What Does RW Rating Mean?

The Weighted Sound Reduction Index, denoted as Rw and measured in decibels, indicates the level of sound insulation of new windows. A higher Rw rating signifies superior acoustic insulating capabilities of the product.

Other Benefits of Double Glazing

Investing in double glazing offers several benefits beyond noise reduction:

Improved Energy Efficiency: Double glazing is renowned for its ability to enhance energy efficiency in homes. The insulating layer of air or gas in double glazed windows acts as a barrier against heat transfer, reducing the need for excessive heating or cooling. By reducing your reliance on heating and cooling systems, you can lower your energy consumption and utility bills.

Enhanced Security: Double glazed windows provide an additional layer of security for your home. The multiple glass layers make it harder for intruders to break through, increasing the safety of your property.

Reduced Condensation: Condensation occurs when warm air comes into contact with a cold surface, leading to moisture buildup. Double glazing minimises the occurrence of condensation by creating a thermal barrier that keeps the inner pane warmer, reducing the chances of moisture accumulation.

Summary of Can Double Glazing Reduce Outside Noise?

When searching for replacement windows, noise reduction becomes a crucial factor for numerous homeowners. Opting for soundproofing windows can significantly decrease external noise levels inside your home. 

Since a considerable amount of the noise we hear enters through windows, replacing them could be the perfect solution to address your noise-related concerns.

Double glazing is a highly effective solution for reducing noise pollution in your home. Its ability to absorb and reflect sound waves, combined with the insulating properties of the multiple glass layers, significantly improves the overall soundscape within your living space. 

Furthermore, double glazed windows offer additional benefits such as enhanced energy efficiency, increased security, and reduced condensation.

Investing in soundproofing windows from Phair Windows & Glass ensures not only a quieter home but also a more comfortable and sustainable living environment. 

Established in 1998, Phair Windows & Glass are a double glazing installer and window installation service. We are proud to be a market-leading home improvement installer in Leicester and across Leicestershire. If you’d some more information about soundproofing or replacing your windows, get in touch with us for a free, no-obligation quote.

Related Articles:


Why is sound coming through my double glazed windows?

Sound may come through double glazed windows due to poor installation, gaps in the frames, or insufficient sealing, allowing sound vibrations to pass through the glass and reduce noise insulation.

Should you be able to hear through double glazing?

Ideally, you should not be able to hear through double glazing. Properly installed and sealed double glazing should effectively reduce external noise, providing sound insulation for your home.

How do you reduce noise in double glazed windows?

To reduce noise in double glazed windows, ensure proper installation and sealing. Consider using high-quality double glazing with a higher Sound Reduction Index (Rw) rating for better noise insulation.

Are double glazed windows more soundproof?

Yes, double glazed windows are more soundproof compared to single-pane windows due to the air or gas layer between the two glass panes, which helps absorb sound vibrations.

Are triple glazed windows better than double glazing for soundproofing?

Yes, triple glazed windows are generally better than double glazing for soundproofing. The additional glass pane and extra air or gas layers provide enhanced sound insulation and reduction capabilities.

Can you soundproof windows

Yes, you can soundproof windows using various methods. Adding thick curtains, using soundproofing seals, installing double or triple glazed windows, and applying acoustic films are effective ways to reduce external noise.

Which windows are best for soundproofing?

Windows with triple glazing and laminated glass are best for soundproofing. Their multiple layers and sound-dampening properties offer superior noise reduction, creating a quieter and more peaceful indoor environment.

How Does Double Glazing Block Out Noise?

Share This Post

Latest Blog Posts

Finance Available

Since 1998

10 Year Guarantee

Fully Accredited

Free Online Quote

Professional, skilled, great communication from the on-site team - honestly, the best workmen I’ve ever had. They left the place tidy and neat. Thanks guys! They did a great job on a dreary, winter’s day with a smile. I love the new porch, which was a decent price. Honestly though, the sales guy Tom and the crew of Cal, Jake and Aaron were great. After having had a bad experience before with a different company, I’ll be using Phair Windows to replace my windows in the near future as well.

It's Quick, Free & Simple!

Request A Free Quote

Scroll to Top