At Colin’s Sash Windows we don’t only supply uPVC sash windows! We offer a comprehensive range of high-quality traditional casement windows at affordable prices, as part of our wider range of double glazed windows that combine style, energy efficiency, and security. One of the most elegant designs is the French casement window, where both sides open with no vertical bar in the middle, creating an unobstructed view. All of our windows are custom-made to suit your home perfectly.
What Are Casement Windows?
Casement windows are hinged at the side and open outward like a door, providing excellent ventilation and unobstructed views. Unlike other window styles, casement windows form a tight seal when closed, making them exceptionally energy efficient and draught-proof. Their simple yet versatile design makes them suitable for both traditional and contemporary homes across the UK, from period properties in conservation areas to modern new builds.
Reasons to Choose Casement Windows
- Maximum Ventilation – Casement windows can be opened fully to allow maximum airflow into your home, perfect for the unpredictable British weather.
- Energy Efficiency – The tight seal created when closed helps reduce heat loss and lowers energy bills – particularly important with the UK’s rising energy costs.
- Enhanced Security – The hook-shaped casement locks embedded within the frame provide superior security compared to other window styles.
- Unobstructed Views – With fewer muntins or glazing bars than other window styles, casement windows offer clearer views of your garden or surroundings.
- Versatile Design Options – Available in uPVC, aluminium, and timber materials with numerous colour and finish options to match any property style.
Getting one of our premium products is among the best ways to save money on energy bills in the long run. If you’re looking to reduce your window replacement cost, you can buy our uPVC replacement windows with complete confidence.
Casement Windows- We are offering
UPVC Casement Windows
We’ve selected the double glazed Deceuninck 2800 system which provides homeowners with high-quality, energy-efficient replacement windows that deliver excellent performance and durability. It really is a superior choice of double-glazing window. Some people believe PVC windows aren’t environmentally friendly, but in fact, they’re 100% recyclable!
These modern uPVC windows are multi-chambered for superior energy efficiency by reducing heat loss and reinforced with steel for added strength and security.
While white uPVC windows remain our biggest seller, if you’re looking for coloured uPVC windows, ours are available in a wide range of finishes. We offer authentic woodgrains or you can have them sprayed in any RAL colour you desire. Grey uPVC windows are increasingly popular, with anthracite grey windows being one of our best sellers. Black uPVC windows are also extremely trendy for contemporary homes.
Although our main business is selling sash windows, we also supply mock sash windows, sometimes called “fake sash windows”. These are top-opening windows with decorative sash horns. Please call us or send an enquiry for more information.
Aluminium Casement Windows
We supply the UK’s biggest selling aluminium double glazed casement windows designed by Smart Systems. The aluminium window price is higher than uPVC windows, but slimline aluminium windows like Alitherm and Smarts Heritage windows that complement our steel-look french doors appear more modern and allow more natural light through.
Our aluminium casement window systems are highly energy efficient and secure. What’s more, they’re 100% recyclable, making them an environmentally conscious choice.
They are available in durable powder-coated colours. Black aluminium windows are the most sought-after, followed by anthracite grey and white. They can also be finished in any RAL colour to match your property’s aesthetic.
Flush Casement Windows
We’ve selected the Deceuninck Heritage flush casement uPVC window also known as flush sash windows. Flush fit uPVC windows are typically more expensive than standard uPVC options, the added investment is well worth it for the enhanced aesthetic and durability they provide.
These windows are designed with sleek, slim sightlines that sit perfectly flush within the frame, eliminating any bulky or protruding edges. The result is a clean, refined appearance that complements both traditional and modern architecture.
Our white flush casement windows remain the most popular choice, but we also offer a wide selection of authentic woodgrain finishes. Among them, grey flush casement windows have become particularly sought after in contemporary and minimalist home designs.
Timber Casement Windows
Although less common today due to their maintenance needs, our bespoke timber casement windows remain a top choice for period properties, offering timeless authenticity and classic appeal. Crafted in Northern Europe—home to expansive, sustainably managed forests—these high-quality wooden double glazed windows combine traditional charm with modern performance.
Our timber windows are especially popular in conservation areas, where planning regulations often restrict the use of uPVC alternatives. Designed to meet these requirements, they provide an ideal solution for heritage homes and listed buildings.
Each window is factory-painted in any colour of your choice and comes pre-glazed for hassle-free installation. You can choose between the traditional stormproof design or the elegant flush casement style, ensuring a perfect match for your property’s architectural character.
What Are the Different Parts of a Casement Window?
The casement windows consist of many parts, but some of the important ones are listed below to help homeowners understand their structure.
Frame: The outer structure that encloses and supports the entire window unit. It comprises:
- Head: The top horizontal part of the frame.
- Jambs: The vertical sides of the frame.
- Sill: The bottom horizontal part of the frame.
Sash: The movable panel that holds the glass. In casement windows, the sash is hinged on one side and swings outward when opened.
Glazing: The glass pane within the sash. Modern casement windows often feature double or triple glazing for enhanced energy efficiency.
Crank Operator: A mechanical device, typically located at the bottom of the window, used to open and close the sash by turning a handle.
Hinges: Metal fittings that attach the sash to the frame, allowing it to pivot open and closed.
Locking Handle: A mechanism that secures the window when closed, ensuring safety and energy efficiency.
Keeper: The component on the window frame that the locking handle latches onto to secure the window.
Weatherstripping: Seals placed around the sash or frame to prevent air and water infiltration, enhancing insulation.
Grilles: Decorative elements that divide the window pane into smaller sections, mimicking the appearance of multiple panes of glass.
Screen: Mesh panels that fit over the window opening to keep insects out while allowing air flow.
Contact Colin’s Sash Windows
We are happy to receive your call every day from 8 am to 8 pm! If you prefer not to speak on the phone, you can simply email us at sales@colinssashwindows.co.uk or send us a message through our user-friendly online form. We will contact you promptly with a competitive quote ready to be discussed.
Serving homeowners across the UK with premium window solutions, Colin’s Sash Windows is your trusted partner for quality casement windows that enhance both the appearance and energy efficiency of your home.
