Horizontal Sliding Secondary Glazing
Here to help
It is suitable for a range of windows, including casement, hinged, and any window with vertical bars. Available in two, three, four, or five panels, the sashes can be completely removed when you need to clean the existing window.
Arguably the most popular product in the entire range, our horizontal sliding units offer a sleek, slimline design aesthetic with minimal sight lines.
Whether for a period property, a listed building, or a city centre apartment, our horizontal sliders seamlessly blend into their surroundings and offer up to 65% reduction in heat loss and up to 80% noise reduction.
It is suitable for a range of windows, including casement, hinged, and any window with vertical bars. It is available in a wide range of sizes, with a choice of configurations, or can be made to fit your home’s exact requirements and specifications.
Available in two, three, four, or five panels, the sashes can be completely removed when cleaning the existing window. They are fitted with brass rollers for a smooth sliding action.
Secondary-glazed horizontal sliders provide access to primary windows for ventilation and cleaning. Each panel can be lifted into the outer frame and swung inwards to facilitate removal. Additional accessories, such as specific locks and handles, are available for increased security.
- Noise, cold, security, and condensation issues are managed and controlled.
- Multiple design options: historical, contemporary, or unusual designs, 200 frame colours, and lift-out panels.
- Multiple glazing options.
- 10 Year Guarantee for all frames and glazing.
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We are a proud supplier of Granada Secondary Glazing (The UK's largest bespoke secondary glazing manufacturer).
“Friendly, helpful staff from sales person to fitter, excellent service all round.”
J Holyhead (Gloucestershire)
March 2026
“Very helpful and reassuring. My window and door were fitted by 2 very nice men and its prefect, we are so pleased, thank you so much.”
K Smith (Gloucestershire)
February 2026
“Very professional service from the quote to the fitting. Very pleased.”
J Ochiltree (Gloucestershire)
January 2026
“We have used Glevum many times over the last 25 years and have never been disappointed with the quality of workmanship, timely service and friendly approachable people.”
M Tattersall (Gloucestershire)
January 2026
"Excellent service and workmanship. Highly recommend."
M Tomlin (Gloucestershire)
November 2025
"Glevum were very professional throughout the purchase and installation and I am happy with the finished result. Installation team were courteous, neat and tidy throughout the process."
R Elliott (Gloucestershire)
November 2025
“Friendly, helpful staff from sales person to fitter, excellent service all round.”
J Holyhead (Gloucestershire)
March 2026
“Very helpful and reassuring. My window and door were fitted by 2 very nice men and its prefect, we are so pleased, thank you so much.”
K Smith (Gloucestershire)
February 2026
“Very professional service from the quote to the fitting. Very pleased.”
J Ochiltree (Gloucestershire)
January 2026
“We have used Glevum many times over the last 25 years and have never been disappointed with the quality of workmanship, timely service and friendly approachable people.”
M Tattersall (Gloucestershire)
January 2026
"Excellent service and workmanship. Highly recommend."
M Tomlin (Gloucestershire)
November 2025
"Glevum were very professional throughout the purchase and installation and I am happy with the finished result. Installation team were courteous, neat and tidy throughout the process."
R Elliott (Gloucestershire)
November 2025