Casement windows remain the most popular choice for homeowners across the UK, from the traditional terraces of West London to the modern developments in Windsor and Berkshire. Their enduring popularity is due to a combination of versatile design, exceptional energy efficiency, and high security.

At Inspired Glazing, we manufacture and install made-to-measure casement windows that provide a precise fit and long-term performance. This guide explains the technical specifications, material options, and functional benefits of casement windows to help you make an informed decision for your home upgrade.

What is a Casement Window?

A casement window is a style where the window sash is attached to the frame by one or more hinges on the side, top, or bottom. Unlike sash windows that slide vertically, casement windows swing outwards to open. This design allows for a large, unobstructed glass area, maximizing natural light and providing clear views.

Because the sash closes flat against the frame, it creates an airtight seal when locked. This fundamental design feature makes casement windows one of the most thermally efficient operable window styles available on the market today.

Top-Hung vs. Side-Hung Casements: Which is Best?

When selecting casement windows, the primary mechanical choice is the orientation of the hinges. Each configuration offers specific functional advantages depending on the room’s requirements and the property’s location.

Top-Hung Casement Windows

Also known as “awning windows,” these are hinged at the top and open outwards from the bottom.

• Weather Protection: The outward-swinging sash acts as a natural canopy, allowing you to keep the window slightly open for ventilation even during light rain without water entering the home.
• Privacy: Because the opening is at the bottom, they are often used in bathrooms or ground-floor rooms where privacy is a priority.
• Compact Spaces: They require less external clearance than side-hung units, making them ideal for high-level openings or tight spaces.

Side-Hung Casement Windows

These are hinged on either the left or right side and open outwards like a door.

• Maximum Ventilation: Side-hung units catch the breeze and funnel air into the property, providing superior through-ventilation.
• Emergency Exit: When specified correctly, side-hung windows can meet Building Regulations for fire escape (Egress) due to their wide clear opening.
• Ease of Cleaning: Many modern side-hung hinges allow the sash to swing sufficiently to enable cleaning of the external glass from inside the building, which is a major benefit for upper-floor installations.

Material Options: uPVC vs. Aluminium

Choosing the right material is critical for the aesthetic and performance of your installation. We offer both uPVC windows and doors and aluminium window systems to suit different property styles.

uPVC Casement Windows

uPVC (unplasticized Polyvinyl Chloride) is a highly durable, low-maintenance material that provides excellent thermal insulation.

• Thermal Performance: Multi-chambered profiles trap air to reduce heat transfer, keeping homes warmer in winter.
• Maintenance: uPVC does not rot, rust, or require painting. A simple wipe with a damp cloth is usually sufficient.
• Cost-Effectiveness: It offers high performance at a competitive price point, making it a popular choice for full-house replacements.

Aluminium Casement Windows

For those seeking a modern aesthetic, aluminium windows offer slim sightlines and incredible strength.

• Slim Sightlines: Aluminium’s inherent strength allows for thinner frames and more glass, maximizing natural light.
• Durability: It is highly resistant to the elements and will not warp or flex over decades of use.
• Customization: Available in a vast range of RAL colours, including the popular Anthracite Grey, to match any architectural style.

To understand which material is right for your project, read our detailed comparison on Aluminium vs. uPVC.

Technical Performance and Energy Efficiency

Energy efficiency is a primary concern for homeowners in the UK. Our energy-rated windows are designed to reduce heat loss and lower utility bills.

1. Low U-Values: We focus on achieving low whole-window U-values. A lower U-value indicates better insulation and less heat escaping through the window unit.
2. Double and Triple Glazing: Our casement windows feature high-quality double glazing as standard, with triple glazing options available for enhanced acoustic and thermal insulation.
3. Compression Seals: High-quality gaskets and seals ensure that when the window is closed, it is completely weather-tight, eliminating draughts.

Security-First Hardware

Security is integrated into the design of every window we install. We use security-first hardware to ensure your home remains protected against unauthorized entry.

• Multi-Point Locking: Unlike older windows with a single latch, our modern casement windows lock at multiple points along the frame.
• PAS 24 Standards: Our window systems are tested to PAS 24 standards, a rigorous UK benchmark for security performance.
• Internal Beading: The glazing beads are located on the inside, preventing the glass from being removed from the exterior.
• Key-Lockable Handles: All opening sashes are fitted with secure, key-lockable handles as standard.

The Made-to-Measure Process: Accuracy and Installation

A window is only as good as its installation. Generic, off-the-shelf windows often lead to poor fitment, draughts, and compromised security. At Inspired Glazing, we provide a comprehensive Survey, Measurement & Quotation service.

• Precise Surveying: Our experts visit your property in Windsor, Maidenhead, or across London to take exact measurements. This ensures the frame fits the aperture perfectly, maintaining the structural integrity and thermal seal.
• Expert Installation: Our installation teams focus on “clean workmanship,” ensuring that the removal of old units and the fitting of new ones is handled with minimal disruption to your property.
• Local Authority: We serve a 50-mile radius from our base, including all 32 London boroughs, providing a trusted local service with clear communication.

If your existing frames are damaged or draughty, our window repairs and replacements service can restore the comfort and security of your home.

Summary of Benefits

• Enhanced Security: Multi-point locking and PAS 24 compliance.
• Reduced Heat Loss: High-performance glazing and weather-tight sealing.
• Maximized Daylight: Slim frames and large glass areas.
• Low Maintenance: Durable uPVC and aluminium finishes.
• Custom Fit: Every unit is made-to-measure for your specific property.

Frequently Asked Questions

How much do casement windows cost?
The cost of casement windows varies based on the material (uPVC vs. Aluminium), the size of the opening, and the glazing specifications. We provide clear, no-obligation quotations following a site survey. Call us on 01753 965 005 to book yours.

Are casement windows secure?
Yes. Due to their design, the sash is held tightly against the frame when closed. Combined with our multi-point locking systems and internal beading, they are among the most secure window styles available.

Can I replace my old sash windows with casement windows?
Yes, this is a common upgrade for homeowners looking for better thermal performance and easier maintenance. We can design casement windows that mimic the appearance of traditional sashes while providing modern benefits.

Do you offer casement windows in London and Berkshire?
Yes. We cover Windsor, Berkshire, and all 32 London boroughs. Our local knowledge ensures we understand the specific architectural requirements of properties in these areas.

Upgrade Your Home Today

Whether you are looking to improve energy efficiency, enhance security, or simply refresh the look of your property, casement windows are a reliable, long-term solution.

Request a call back or call Inspired Glazing on 01753 965 005 to discuss your project and schedule a professional survey.