Acoustic testing of our windows and doors - Westbury Windows and Joinery

Acoustic testing of our windows and doors


As part of ensuring the premium quality of our products, all our windows and doors are tested by a third party UKAS accredited centre to meet British and European Standards.

Last month, several new Westbury Windows and Joinery products underwent acoustic testing and we’re very proud of the excellent scores that they have received. Across the board, our results show that we perform just as well as our industry competitors, even outperforming them when it comes to traffic noise testing (a sought after requirement for many of our clients).

The acoustic test results of our French doors are particularly impressive when compared to industry standards because the opening gaps and ironmongery of French doors make it notoriously difficult to achieve good noise reduction performance. The fact that Westbury has created a French door that performs equally as well as a casement window is something that we are really proud to shout about.

Acoustic performance is measured using the Weighted Sound Reduction Index (Rw) is a number used to rate the effectiveness of a soundproofing system or material. Increasing the Rw by one translates to a reduction of approximately 1 decibel in noise level. Therefore, the higher the Rw number, the better the sound insulation.

We would like to take this opportunity to share our brilliant results with you. The following test results demonstrate the Rw of various Westbury products in accordance with BS EN ISO 10140-2:2010; the British Standard European Norm for measuring the level of sound insulation of building elements. Each result is followed in brackets by an adjustment  (C,Ctr) these are figures you deduct for an accurate reduction index of pink noise (C) (random low-frequency noise) and traffic noise (Ctr).

Product type Acoustic test result
Casement window 38 (-1;-4)
Box sash window 35 (-1;-2)
Lower spec glass, box sash window 33 (-1;-3)
Spring balanced sash window 36 (-1;-3)      
French door 38 (-1;-4)    

You can see the acoustic tests being carried out on our windows and doors here:

Benefits of acoustic proof windows and doors

It probably goes without saying that acoustic proof windows and doors are an ideal solution for any project located near to a busy road, railway track, flight path, factory, or simply if a property development is looking to offer the quiet, relaxing life as part of its USPs. These products typically also lend themselves well to restoration projects, where the original windows and doors may not meet modern lifestyle demands.

More energy efficient

Soundproofed windows will greatly reduce air infiltration into the property, aiding heat installation, and improving emissions. Since most property owners would welcome an opportunity to reduce their utility bills, ensuring soundproof windows are installed can massively improve long-term customer satisfaction.

Increased real estate

Not only do windows and doors with a high performing acoustic rating have the potential to reduce property owner’s bills, but they will also prove to be a long-term investment by contributing toward a considerable increase in a property’s real estate value over time.

Improved security

As well as achieving fantastic noise reduction, the technology and materials used for handcrafting Westbury windows and doors makes each product tougher and more resistant to damage, making them safer for both residential and commercial properties.

Bespoke results for your bespoke projects

The acoustic test results above serve as a useful guide to benchmark Westbury’s products against others on the market, but it is important to bear in mind that different sounds will have different frequencies, and therefore these results are not always going to be applicable to individual projects.

If you are an architect or specifier, and you would like to discuss the acoustic testing of our windows and doors in relation to a particular sound frequency or bespoke project, we will be more than happy to help – just get in touch.