Double-glazed flush sash windows offer enhanced insulation and security compared to standard windows

Q: What are the main benefits of double-glazed flush sash windows for my home?

Double-glazed flush sash windows enhance your home's appearance and security while providing excellent weather protection and energy efficiency, helping to reduce heating costs.

Q: How do smart features like Kubu® Smart Security Sensors improve the safety of flush sash windows?

Kubu ® Smart Security Sensors enable you to check whether your windows are open, closed, or being tampered with via a smartphone app, adding an extra layer of security.

Q: Are flush sash windows suitable for both modern and traditional homes?

Yes, flush sash windows feature a sleek, modern design with a flush fit that complements both traditional and contemporary homes, enhancing their aesthetic appeal.

Q: What kind of energy efficiency can I expect from flush sash windows?

Flush Sash windows can achieve a top-tier BFRC energy rating of A++, with some configurations rated A+, significantly improving energy efficiency and lowering heating bills.

Q: Why should I choose Glevum for my window replacement project?

Glevum has over 40 years of experience, is FENSA-approved , offers a 10-year guarantee, and has served over 45,000 customers, providing reliable, high-quality service and products.

Here to help

Consider upgrading your home with double-glazed, flush sash replacement windows from Glevum. Enhance both appearance and security. Explore their key advantages below.

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.

When picturing new windows, many think of the bulky frames common for decades. But what if you could get modern warmth and security without sacrificing your home’s style? This is where flush windows change the game. The name describes the design perfectly: the window’s opening section sits completely level with the frame, creating one flat, seamless surface. This clean profile offers a high-end alternative to the overlapping look of standard windows, creating a tighter seal for better warmth and security.

Modern, clean appearance.
Slim sight lines for enhanced views.
Complement both traditional and contemporary homes.
Exceptional energy efficiency.
Strong weather protection.
Excellent value for money.

This window range has achieved a top-tier BFRC energy rating of A++ for select configurations, with other options rated A+.

With over 40 years of experience and a strong reputation in Gloucestershire, Glevum ensures a smooth window replacement process. Our windows include a 10-year insurance-backed guarantee for quality and durability. Financing is available, allowing you to upgrade to energy-efficient windows without delay. To get started, book a free home visit and discover why many homeowners choose Glevum.

Frequently Asked Questions:

What are the main benefits of double-glazed flush sash windows for my home?

How do smart features like Kubu® Smart Security Sensors improve the safety of flush sash windows?

Are flush sash windows suitable for both modern and traditional homes?

What kind of energy efficiency can I expect from flush sash windows?

Why should I choose Glevum for my window replacement project?

Looking for replacement flush sash 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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“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