Casement Windows
As the most popular window style in the UK, our casement windows can offer plenty of natural light across South London, Surrey, and Kent. Start a free quote with Osborn's today.
What is a Casement Window?
A casement window is hinged at the side of the frame, with an additional hinge sometimes attached to the top or bottom of the window. This allows for the window to be fully opened; often using a handle in the middle of the window frame. Because of their simple yet effective design, casement windows can be configured in any layout that your property requires. They’re often paired up with each window opening outward in different directions, but single casement windows work just as well for smaller rooms.
A Flexible Design
Casement windows are hinged at the side or the top. They can be arranged in almost any configuration, from a single narrow bathroom window to wide paired units across a living room.
More Light and Airflow
The full-width opening sash lets in plenty of natural light and fresh air, and makes it easier to cleaning the outer pane from inside your home.
Strong Thermal Performance
Available across VEKA, Halo, and Deceuninck profile systems, our casement windows are built with multi-chamber frames designed to help reduce heat loss through the window.
High Security
Every casement window includes a multi-point locking system as standard, with PAS 24 enhanced security specification available where a higher level of certification is needed.
Casement Window Options
Every range comes in its own choice of colours and finishes, from smooth whites and realistic woodgrain foils to powder-coated and heritage shades. Download the brochure below to see the full palette, or ask us to bring samples to your free survey.
Our Gallery
Take a look at our portfolio of previous projects that could help you get inspired. Every job shown is one our team has surveyed, supplied, and fitted, so you can see exactly the standard of work you can expect from Osborn's.
Casement Window Features & Benefits
Our casement windows combine slim sightlines with modern thermal performance, giving you more natural light, easier maintenance and a secure, weathertight seal that lasts.
Flush Fitting Sashes
The sash sits flush within the frame for a clean, traditional line that suits period and new build properties alike. The result is a neater exterior face with none of the stepped profile you get on a standard casement.
Slim Sightlines
Narrower frames mean more glass and more daylight for the same aperture. Slim sightlines are particularly effective on bay and multi-light configurations, where several frames would otherwise crowd the opening.
Thermally Efficient
Multi-chamber frames and warm-edge spacer bars achieve U-values as low as 1.1 W/m²K. Better retained heat means a more comfortable room in winter and lower energy bills year round.
High Security
Every casement window is fitted with multi-point locking as standard and can be specified to PAS 24 enhanced security. Internal beading means the glass cannot be removed from outside.
Wide Choice of Finishes
Choose from the full RAL range including Anthracite Grey, Jet Black, Cream and Agate Grey, with dual-colour options so the inside and outside can differ to suit your interior.
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Areas We Cover
Based in South Norwood, we cover South London, Surrey, Kent, and Sussex. We also take on larger projects nationwide. Get in touch to confirm we cover your area.