Box Sash Windows

Box Sash Windows, also known as Vertical Sliding Windows, Vertical Sliders or Victorian Sliders, are a traditional style of window which are most commonly found in older properties. Traditionally they are manufactured from timber. Box Sash Windows are an elegant window design and are very popular choice in period homes around the Country. Their design is very sophisticated and provides extra charm and style that just cannot be achieved using standard casement windows. Real timber windows are very expensive, and require maintenance, including painting. They are also known to expand and contract in temperature and weather extremes, so the majority homeowners nowadays look for a more affordable solution such as uPVC Vertical Sliders, or uPVC Box Sash Windows. 

At Composite Doors Cardiff Limited, we have invested time researching and testing out products to find the best of each class. We feel that ECOSlide offers the best solution to uPVC Box Sash windows. As standard, all windows are provided a-rated, with toughened security glass and high performance locking systems, plus they look fantastic and come in a massive range of modern and traditional colour. 

victorian sliders

Pole Eyes

Used for opening and closing the top sash. One Pole Eye is fitted to windows up to 479mm wide. Two are fitted on windows 480mm wide and over.

Tilt Knob

Allow inward tilting of the sliding sashes for easy and safe cleaning from inside the home. Two Tilt Knobs are fitted as standard.

Sash Lift

Used for opening and closing the bottom sash. One Sash lift is fitted to windows  up to 479mm wide. Two are fitted on windows 480mm wide and over.


Sash Locks

Lock both bottom and top sashes firmly in place when the window is fully closed. Key lockable. One Sash Lock is fitted to windows up to 799mm wide. Two are fitted on windows 800mm wide and over.

Travel Restrictors

Provide enhanced security and safety for your vertical sliding sash windows. Used to restrict the opening of the window to just 100mm. Key operated.


D Handles

These optional easy-grip handles can be used in place of pole eyes or sash lifts and can be fitted externally on the bottom of the top sash for ease of operation.

Attention to detail

It’s the little details that help make ECOSlide sash windows as authentic as possible. Our PVC-U windows are designed to be smooth and sleek with slim profile sections giving a better appearance, which is pleasing to the eye as well as offering improved views from the inside and outside.

To complete the timber-like appearance, our windows incorporate the same stylish features found on original timber sash windows such as run through sash horns or plant-on horns if required, astragal bars or Georgian bars and traditional-style operating hardware. The jambs, sash sections and meeting rail are all engineered to look just like a timber sash window, giving you truly authentic looking new windows.

Mock or Plan On Horns

Astragal Bar

Run Through Horns

Georgian Gar

Bakery Window Display
How to make an enquiry

If you would like to find out the cost of Box Sash / Vertical Sliders for your property just contact us with some basic details. We'll need a photograph of all sides of your property with windows you are considering changing as well as some basic width and height measurements. Please click here if you need some assistance with measuring.

Once you have the measurements and photographs ready just email us!

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Composite Doors Cardiff Limited is an introducer appointed representative of Phoenix Financial Consultants Limited ("Phoenix"). Phoenix is a credit broker that is authorised and regulated by the Financial Conduct Authority (Financial Services Register No. 539195) which offers finance for home improvement projects from its panel of lenders. All finance subject to status and credit checks.

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Company No. 11654260. Registered in England and Wales.
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Unit 3a Palmers Vale Business Centre
Palmertson Road, Barry CF67 2XA