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Vertical Sliding Windows
Vertical sliding windows combine all of the benefits of high-performing modern materials and functionality with cherished heritage character and design.
What is a vertical sliding window?
Vertical sliding windows, also known as sliding sash or box sash windows, are designed to replicate traditional Georgian timber windows that slide open vertically as opposed to casement-style windows that open outwards. Balancers counter the weight of the sashes to provide easy operation and to allow the sashes to remain open in any position. On a single hung window the top sash is fixed and the bottom sash operates vertically.





Your perfect vertical sliding windows from Puredoubleglazing
Double or triple glazed vertical sliding windows installed by Puredoubleglazing will improve your living environment from the moment they are installed, reducing heat loss, and keeping your home warmer, and more secure. Ideal for South East homes both new and old, our uPVC vertical sliders replicate timber so authentically that they have often been accepted in conservation areas. Conservation areas are places where the period character and heritage of buildings are protected and preserved.
With our vertical sliding windows, manufactured by Rehau, your home will be lighter, brighter, and of course, more energy efficient. Available in a beautiful array of colours and timber-effect woodgrain finishes, we have the perfect vertical sliding window solution to suit your home.
Vertical sliding window finishes and features
Colours perfectly suited to vertical sliding windows
All of our products, including uPVC vertical sliding windows, can be finished in a wide variety of colours and wood grain effect surfaces. Whether you want a traditional look or a more contemporary finish; there’s sure to be the perfect colour to match your home and your personal taste. Choose from popular shades that include Cream, Anthracite Grey, Chartwell Green, and many more.
Glazing options to suit your home
We will be happy to offer expert advice on the best type of glazing to complement the style and character of your property, whilst also meeting your personal requirements.
We install double or triple glazing, as well as specialist glazing. Specialist glazing can include types such as toughened glass and self-cleaning glass. We also install obscure glass for enhanced privacy, and decorative glass to enhance the character of your home.

Technical features of vertical sliding windows
- Multi-chambered uPVC profiles or thermally broken aluminium profiles
- ‘A’ WER (Window Energy Rating) as standard
- Argon gas filled sealed units
- U-values as low as 1.2W/m²K
- Internal beading

Energy efficient and secure vertical sliding windows
Replacement windows must achieve a Window Energy Rating of C or above. Here at Puredoubleglazing, we offer windows with up to an A+ energy rating. Not only are our vertical sliding windows compliant with current regulations, but they could save you hundreds of pounds over the years in heating bills.
- Designed and manufactured to A+ energy ratings
- Specialist energy saving glass available
- Argon-filled sealed units
- Triple glazing option available
We take the security of our windows seriously. That’s why we can offer casement windows that include:
- Internally beaded windows that keep intruders out
- High quality hinges and locks
- Market leading Yale locks
Peace of mind with our aftercare package
Here at Puredoubleglazing, we pride ourselves on being on hand for our customers from start to finish, however, we don’t believe the journey is over once the installation is complete.
We offer what we call our aftercare package. We will make a call 4 weeks after the installation completion, and should there be any issues whatsoever, we will send out our aftercare team who are on hand to make adjustments, carry out repairs, glass replacements, and more, at no cost to you.
Our aftercare package does not carry a call-out charge and nothing is too much trouble. Our team is passionate about completing each job to the highest standard.
View examples of our latest installations
What better way to get an idea of the quality of our work than to take a look at some past examples of our installations? View our gallery for your next home improvement inspiration.

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Over 18 Years TradingEstablished in 2003, Puredoubleglazing and Doors are a trusted, family-run, local double glazing company improving homes across South East England.
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Best Quality ServiceHigh-quality service is guaranteed with Puredoubleglazing and Doors. We offer the finest products at great value, taking pride in every installation we complete.
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Competitive PricesNot only are our products high quality, but they are also priced competitively to ensure our customers get the best installation at the best possible price, every time.
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Professional AftercarePuredoubleglazing will be there for you every step of your home improvement journey, right from your initial enquiry through to aftercare once your project is complete.