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Stunning to look at, durable and offering near-unbroken views out (and plenty of natural light in), aluminium slimline casement windows are thoroughly modern and effortlessly stylish. Whether you’re building a new property or want to modernise an older one, these minimalist, flush-fit windows are hard to beat.
Like all our aluminium windows and doors, our casement windows are engineered to last and installed by an experienced team of specialist technicians. No matter how complex or unique your project is, we can carry out a top-tier installation that will last for years to come.
Download a brochure to explore the range of products we can offer or request your free quotation.
Slimline casement windows are the UK’s most popular type. Typically side-hung (although top-hung versions are available), they can be fitted in a whole host of different configurations, making them extraordinarily versatile.
We can supply both double and triple-glazed panels, meaning you don’t have to compromise on thermal efficiency either. Learn more about the windows we supply below.
Aluminium casement windows share the same benefits as regular aluminium windows (think durability, security and energy efficiency) but utilise a flush-fitting, ultra-modern design. These windows offer:
We’ve installed aluminium casement windows in properties across the UK, both for businesses and residential customers. From new builds to historic homes, our windows can transform the look of your property.
We’re not prepared to settle for anything less than the best here at Klosen. That’s why we only supply slimline casement windows from Senior Architectural Systems and Cortizo, two of the industry’s leading brands.
Both companies are relentless in their pursuit of ultimate thermal efficiency, security, durability and – of course – aesthetics. Rigorously engineered and tested, the windows we supply come with lengthy guarantees and are offered in a range of finishes. Whatever your requirements, we’re confident we’ll have just the right product for you.
Download a brochure today to learn more about the windows we supply.
Since 1972, Spanish company Cortizo has been leading the way in the manufacture of aluminium windows and doors. Working exclusively with aluminium, Cortizo has established itself as one of the industry’s major players.
All of its products are built to last, and all have been designed to beautifully combine function and form: in terms of aesthetics, very little else can come close.
We have improved many properties across the UK with quality Cortizo windows and doors. Our work in Skidby, Peterborough demonstrates how slimline aluminium glazing has been successfully incorporated into modern architecture, improving the property’s atmosphere and functionality by maximising natural light.
As well as that, our team also used Cortizo slimline casement window solutions to enhance Lowgate in Lincolnshire. A decision was made to replace old uPVC doors and windows with new aluminium ones to improve the appearance and functionality of the property.
We offer a 10 year guarantee on all aluminium profiles and 25 years for the powder coating element
Stay warm in the winter and cool in the summer whilst cutting down on energy bills
Our team are flexible throughout the entire process, including the design and installation of windows
Klosen have over 25 years experience working with designers, architects and homeowners
British manufacturer Senior Architectural Systems (SAS) has been around since 1991, and has risen to prominence as one of the nation’s largest and most well-respected suppliers of double and triple-glazed aluminium windows.
Consistently innovating and improving upon its products, SAS is known for its commitment to durability and thermal efficiency. The expanded polyurethane thermal barrier in its aluminium windows gives them exemplary thermal performance and water resistance.
Klosen brings over 25 years of experience to every project, ensuring that our clients receive the highest level of expertise and craftsmanship. With a solid five-star reputation, we are committed to delivering exceptional results, no matter the size or complexity of the project. We offer a standard 10-year guarantee on all our work, providing peace of mind and confidence in the quality and longevity of the services we provide.
Our team has a proven track record of working on prestigious, high-profile projects, including a stunning Grand Designs home and the iconic ABBA Arena in London. This experience has honed our skills and reinforced our ability to deliver on time, within budget, and to the highest standards, making Klosen a trusted choice for all your construction needs.
We’re proud to have supplied and installed Cortizo casement windows for a Grand Designs project in South Lincolnshire back in January of 2021. This stunning home was modelled on a historic Dutch barn but looks thoroughly modern – thanks in part to those contemporary and cutting-edge windows.
Based in Market Deeping, Lincolnshire, we serve the entirety of Cambridgeshire and Lincolnshire, as well as London and the surrounding areas. Generally, we cover areas within a 60-mile radius of our base. Locations we frequently visit include Peterborough, Bourne, Stamford and Huntingdon.
Slimline casement windows are a type of window that features narrower frames and profiles compared to traditional casement windows. This design maximises the glass area, allowing for more natural light and a cleaner, more modern aesthetic.
Although aluminium casement windows are pricier than the PVC or wooden equivalent, they are more durable and secure – not to mention more modern-looking. Prices vary depending on the size of the window and the finish you opt for, so please get in touch with us for an estimate.
Both our Cortizo and Senior Architectural Systems windows are very secure, having passed stringent PAS24 certification tests.
A range of finishes can be specified, including optional powder coating finishes in any custom RAL colour – there’s guaranteed to be a shade that suits your property!
