Vertical Sliding Sash Windows - IQ Glass International

Vertical sliding sash windows, sometimes known as guillotine windows, are innovative glazing solutions that give projects a ‘wow’ factor. 

Oversized Vertical Sash Windows

Our sliding sash windows are designed to offer a bespoke opening, pairing minimal design with smooth action openings.   

The large, insulated units can be used to create vertically sliding glass walls, introducing paths of natural light into the property thanks to the high glass to frame ratio.

Able to be specified in two or three-pane configurations and as double-height glazing elevations, this unique glazing solution is sure to enhance the design of any project.

Double Height Sash Window

This unique glazing solution is often specified as a double-height window. This means that whether the window is designed as a two or three pane system, as the bottom pane lifts up over the other pane it leaves an open aperture that can be used as an access point.

IQ have designed and installed many of these systems around the world, including a 6.5m tall vertical sliding sash window at our showroom in the UK. 


When specifying large glazing solutions where pane can weigh upwards of 500kg, we may recommend incorporating a motor to allow the system to be operated automatically with an easy control option.

Control options for automated sash windows including a wall switch, remote or it can be integrated with smart home automation and BMS systems. 

For more information on vertical sash windows and how they can be incorporated into your next glazing project, contact the IQ team today.

Why Work With Us

We are able to work with designers and specifiers from an early stage of a project to ensure that no compromises have to be made on design. Our expert glazing technicians are here to help your design become a reality, lending their years of experience to your project team for design advice, performance guidance and cost implications. To find out more or arrange a meeting with one of our expert glazing consultants or just contact the team on 01494 722 880.


Our years of experience allow us to create bespoke glass constructions with minimal detailing and expert quality.


Our specialist in house contract management team oversees your glazing project from beginning to end.


Our technical skillset and high levels of customer service mean that architects and contractors return to us time and again for their commercial glazing projects.


Our in house team of CAD designers and engineers contains twelve expert designers and is fully supported by a structural engineer for specialist structural glass calculations.


Our expert glazing specification advisors are available to help you finalise your architectural glazing designs before the tender stage.


We offer a full NBS style specification service for architects who wish to ensure the correct aesthetic and performance is achieved from their documentation.

International Glazing Blog

IQ International specialises in providing structural and architectural glazing solutions for some of the most prestigious construction projects around the world. Our blogs provide technical glazing advice about a range of specialist glazing topics. From solar control glazing to beachfront glazing specification, IQ are on hand to provide helpful information.

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Address: IQ Glass Global Headquarters, Sky House, Raans Road, Amersham, UK, HP6 6FT