Enhance your home's appearance and comfort with our uPVC double-glazed replacement windows

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Enhance your home with Glevum’s high-quality uPVC double-glazed casement windows, which offer traditional design along with modern durability and energy efficiency.

Smart as Standard: These windows include Kubu® Smart Security Sensors. The Kubu® Smart Alerting System lets you check whether your window is open, closed, or being tampered with via a smartphone app. T&Cs apply.

If you experience drafts or find your older windows difficult to operate and maintain, consider casement windows. Hinged on the side, casement windows offer excellent thermal insulation, lower energy costs, unobstructed views, improved airflow, require minimal maintenance, and enhanced security with multi-point locking. Now smart as standard.

Since 1984, Glevum has served Gloucestershire, Cheltenham, Gloucester, Hereford, and Monmouth, offering a 10-year guarantee and extensive experience. Our window styles include versatile tilt-and-turn, elegant bay, and bay with tilt-and-turn options. We also provide a range of colours and customisation to suit your preferences. To discuss your needs, please book a free home visit.

Casement window colour options:

Enhance your windows with our uPVC Casement windows, available in a variety of foiled and standard colours, as well as made-to-order colours.

You may also select different colours for the interior and exterior surfaces.

Alternative casement window configurations:

Tilt and Turn (two-way opening): These windows feature a hinge mechanism that allows inward tilting from the bottom for ventilation and easy cleaning. They are ideal for balconies and terraced houses, as they open fully inwards to maximize outdoor space.

Bay Style Window: Designed to create a sense of space, depth, and light. Using our casement windows, they can be individually tailor-made to your exact requirements.

Bay with Tilt and Turn: Tilt and Turn functionality can be incorporated into a Bay-style window.

What are the benefits of choosing Glevum's uPVC double-glazed replacement windows?

Glevum's uPVC double-glazed replacement windows enhance your home's appearance, improve thermal insulation to reduce energy costs, offer excellent weather sealing, include multi-point locking for security, and require minimal maintenance, making them a smart, sustainable choice for homeowners.

How do the Kubu® Smart Security Sensors enhance the security of Glevum's windows?

The Kubu® Smart Security Sensors let you check whether your windows are open, closed, or being tampered with via a smartphone app, providing added peace of mind and advanced security control.

What customisation options are available for Glevum's casement windows?

Glevum offers a variety of colour options, including foiled, standard, and made-to-order colours, and the ability to choose different colours for interior and exterior surfaces, as well as various configurations such as tilt-and-turn, bay, and bay with tilt-and-turn.

Why should I consider working with Glevum for my replacement windows?

Glevum has been serving Gloucestershire and surrounding areas since 1984, is FENSA-approved, a Kubu Pro Installer, and offers a 10-year GGFi-backed guarantee, backed by over 45,000 satisfied customers and extensive experience, ensuring quality and reliability.

What services are offered during the free home visit?

During the free home visit, Glevum's team will discuss your needs, offer expert advice, provide a tailored quote, and guide you through available options to help you choose the best window solutions for your home.

Looking for replacement uPVC casement windows in Cheltenham, Gloucester, Hereford or Monmouth? Then here’s why you can feel good about working with Glevum:

We have been in business since 1984 and bring a wealth of knowledge and experience.
We are a leading FENSA-approved window and door installer based in Gloucestershire.
We are a Kubu Pro Installer.
All our windows and doors include a 10-year GGFi-backed guarantee.
Our dedicated Service Department is here to support you.
More than 45,000 customers enjoy the security and quality of our windows and doors.
About half of our work comes from returning customers and recommendations.
We offer a range of Finance Options. Just ask for details during your free home visit or quote.

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How can we help?

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0800 332255

Glevum Windows Doors Conservatories. Leading AWARD-WINNING Gloucestershire supplier and installer of Aluminium and uPVC.

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“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