Best Soundproof Windows

Noise can be a major issue for any home, whether from outside traffic, noisy neighbours, or construction. Aside from a view of the outside world, reducing noise is one of the major functions of a window, helping to insulate your home for improved peace and quiet. Although some windows perform better than others, by choosing the right soundproof window, you can significantly reduce any external noise. 

For maximum noise reduction, laminated windows are the best choice. Their polyvinyl butyral (PVB) interlayer absorbs and dampens sound vibrations to significantly reduce noise transmission. Doubled or triple-glazed windows are both strong alternatives, using two or three layers of glass separated by an insulating gap to disrupt sound waves. Triple-glazing performs slightly better at noise reduction, but comes at a higher cost. For optimal results, you should also consider the window frame material, with uPVC and timber providing excellent sound insulation.

Why is it Important for Windows to be Soundproof?

Choosing to soundproof your windows can offer immeasurable quality of life improvements. These include the following:

Better sleep and relaxation

Noise pollution can disrupt sleep cycles and your overall well-being. Therefore, by soundproofing the windows in your bedroom, you can improve your sleep significantly, benefiting brain function and health. 

Less distraction and increased productivity

When you’re trying to work, study or relax at home, outside noises can easily cause distractions. Soundproof windows can help alleviate these disturbances to keep you productive and focused on the task at hand.

Peace and quiet

Soundproofing can block out any unwanted noise from urban environments, road traffic, landscaping equipment or noisy neighbours. This helps to promote quiet within your home. 

Keep your sounds to yourself

Soundproofing can also work both ways. It can be used not just to block exterior sounds, but also to keep the sounds within your home from going out. If you’re concerned about privacy and want to ensure your neighbours or passersby aren’t aware of your conversations or noise, consider soundproof windows. 

Property value

In a competitive property market, adding soundproof windows can increase the value of your home. Like double-glazed windows, soundproofing is viewed as an attractive feature for any home buyer. 

How to Measure the Soundproof Performance of Your Windows

In Australia, the Weight Sound Reduction Index (Rw) is the primary tool to measure the noise-proofing performance of windows. This rating is expressed in decibels (dB) and conveys how effectively a soundproofing material, such as a window, can reduce airborne sound. The higher the Rw rating, the better the material performs at sound insulation. Typically, an Rw rating of approximately 35 is suitable for residential neighbourhoods, while those near busy roads or airports may consider an Rw of over 40.

You may also encounter the Sound Transmission Class (STC), which is commonly used overseas.
The Sound Transmission Class (STC) is another rating system that is used internationally. Like Rw, a higher STC rating indicates a superior sound reduction performance. However, it’s important to not use these two ratings interchangeably, because Rw covers a wider frequency range than STC, meaning the two figures will differ slightly.

Which Windows Provide the Best Noise Insulation?

Not all windows are equally effective at noise insulation. The right type of window can ensure you maximise the soundproofing of your home. The following are some of the major window types and their noise reduction capabilities: 

Standard single-pane

The traditional type of window which has just a single pane. Because they have only one layer of glass, they offer minimal noise protection and are the least effective window option. 

Double-glazed

One of the best choices for soundproofing, double-glazed windows combine strong performance with cost-effectiveness. They consist of two glass panes separated by an insulating air gap. This gap helps to disrupt sound waves, which helps to prevent noise from easily passing through. These windows can cut external noise by approximately 30–40 dB, and are perfect for homes within urban environments and traffic. They also help to improve insulation, with the air gap creating a thermal barrier that limits heat transfer, which can reduce costs for heating and cooling.

Triple-glazed

Triple-glazing takes the benefits of double-glazing to another level. Using three glass panes instead of two creates an additional barrier against noise, with impressive soundproofing. These windows are ideal for homes in noisy areas, such as near a highway or an airport. The additional layer means triple-glazed windows can block approximately 45–50 dB, while also offering superior insulation to save homeowners money on energy bills. However, they are more expensive than standard double-glazed models. 

Laminated windows

Laminated windows refer to two or more glass panes that are bonded together with a plastic-like interlayer of polyvinyl butyral (PVB). The addition of the PVB layer helps to dampen sound wave vibrations, which significantly reduces noise transmission. This design also adds an extra layer of security and UV protection for homeowners. Laminated windows provide the strongest amount of soundproofing among window options; they are also the most expensive, so it’s important to weigh up their benefits with the added cost. 

Factors That Affect Soundproofing

Several factors can affect the soundproofing performance of your windows. These include:

Air space between panes

The larger the gap between the sheets of glass, the greater the noise reduction. This is because bigger gaps disrupt sound waves more effectively, increasing the distance they travel. Larger gaps are particularly effective against low-frequency sounds, such as traffic. 

Glass thickness

The thickness of your glass will heavily dictate its ability to stop sound waves. Thicker glass has more mass and can stop noise transmission more effectively by absorbing and reflecting sound waves. 

Installation quality

We recommend a professional installation to ensure all proper steps are taken for maximum sound protection. For example, professionals can ensure that proper weather-stripping and sealing around your windows is carried out. Gaps or leaks can allow sound to penetrate, with effective sealing using acoustic caulk and polyurethane foam to create a watertight framework. Make sure you always choose qualified professionals with a proven track record, such as the experts at Windows For Life. 

Window location

The location of your window is an often-overlooked factor when it comes to soundproofing. This can be an important point to consider when building or renovating, as certain window locations can help improve soundproofing. For example, installing windows further away from any sources of noise, such as neighbouring properties or busy sidewalks.

Choosing the Right Frame Material for Maximum Soundproofing

Choosing the right frame material is just as important as the window itself. Frames made of uPVC are one of the best choices, providing strong noise insulation. Timber frames are a natural insulator, with their high mass density and strength, helping to block sound waves. Fibreglass frames are another strong choice with impressive insulating properties. Furthermore, because they expand and contract less than other frame materials, they maintain a tight seal to prevent sound from breaking through. 

We recommend avoiding aluminium frames, as they are generally a poor choice for soundproofing because of their rigidity and low density. 

How Much Does it Cost to Soundproof a House?

The total cost of soundproofing your home will depend widely on several factors, such as the type of window installed, size and any additional soundproofing measures. To give homeowners an idea of the cost for each window type, consider the following price estimates:

*Please note these are estimates based on standard glazing or laminating for a small to medium-sized project. The final costs will be affected by window size, type and width.

Obviously, the more windows you choose to install will naturally increase the cost, as well as your choice of frame material. Although timber and steel provide excellent sound insulation, they are more expensive than other materials. However, you should always assess the initial investment with the long-term benefits, as windows that improve insulation can also reduce heating and cooling costs, for increased savings.  

For an accurate estimate for your home, please contact the team at Windows for Life.

Other Ways to Reduce Sound Through Your Windows

In addition to choosing the right type, there are also other ways to improve your window’s soundproofing. These include the following: 

Window inserts

A window insert is specifically designed to reduce unwanted noise from entering, using a thick, sound-absorbent material such as acrylic. When outside noise starts entering your home, the insert can fit simply into any standard window frame to block sound waves. 

Sealing gaps or cracks

If you have cracks or gaps around your soundproofing windows, you likely won’t notice any benefits. Check the areas around your windows, doors, vents, and pipes for any cracks, and fill them with sealant to reduce outdoor noise. This can also improve the overall insulation of your home.

Soundproofing film

Soundproofing film is a modern technology that incorporates a thin, plastic sheet applied directly to your glass windows. This film adds density to the window panel, helping to block the amount of sound waves entering to improve soundproofing. 

Noise-cancelling curtains

You may consider adding thick, noise-cancelling curtains to add an extra layer of sound reduction. These curtains use a heavy fabric such as velvet, lined with a sound-absorptive material such as vinyl. Because of their thickness, noise-cancelling curtains can also improve your home insulation to keep heat from escaping. 

By installing soundproof windows, you can ensure your home remains calm and peaceful. This can lead to improved sleep and relaxation, reducing distractions so you can remain proactive throughout the day. Laminated and double-glazed windows are both excellent solutions that deliver lasting results. To find the right soundproof window solution for your home, contact the experts at Windows For Life for a professional installation and tailored advice.