Klosen supplies and installs slimline casement windows, offering a fully customised design to suit the period of your property. Get your quote from us today or download our brochure to see the design opportunities available.
To find out more, download a brochure or request your free quotation.
Get a 10-year guarantee on your window installation from Klosen.
Benefit from lower energy bills and a warmer home in winter.
Every design is bespoke and made-to-measure for your property.
Slimline casement windows are a tasteful style for period properties, both in city townhouses and countryside cottages. As for their style, slimline casement windows are typically characterised by their hinges, which open outwards like a door.
The slimline element refers to thinner frames that offer a sleeker, smoother finish and more room for the glass panes.
Aluminium gives these windows a robust frame that is naturally corrosion-resistant but also can last a decade longer than uPVC frames.
We offer fully bespoke designs and can offer the following styles:
You can also choose fixed casement windows, distinctive for the fact that they aren’t openable. They offer an elegant ‘picture window’ making them a suitable choice for ground-floor rooms, stairwells or landings that offer a pleasant outside view. This design option is also ideal if you want unobstructed views.
Flush casement windows are an increasingly popular choice. They’re designed to sit flush with the frame so they offer a completely flat and smooth surface when closed.
Check out our projects and case studies for pictures of the windows and how they look for properties of all styles.
Thanks to the polyamide thermal break, these windows improve home insulation and energy efficiency, leading to lower energy bills, reduced drafts in winter and a more eco-friendly building.
A huge benefit of the casement window style is that you can open the windows wider, making them a great choice for ventilation in the summer!
With Klosen’s help, they can be customised to suit various architectural styles, creating a flush look for the facade of your property. You’ll also get to choose the colour of your frame—and there are no slim pickings on colour options! Whether you prefer classic white or black or something more unique to your design preferences, we can make that happen.
To get a feel for how we could elevate your property, explore our brochure for design inspiration.
Discover why homeowners and architects across the East of England trust Klosen for exceptional slimline casement windows and service.
Skilled team:
Our skilled team meticulously handles every detail, ensuring precise measurements and seamless alignment. We take pride in our work, dedicated to bringing your vision to life and achieving complete customer satisfaction. We’re an Assure-certified installer and ensure all our engineers have all the latest training. Our installation work has even been featured on Channel 4’s Grand Designs, making us a trusted name.
Hassle-free installation:
Benefit from a quick and hassle-free installation process. We keep you informed every step of the way, allowing you to focus on other aspects of your project.
Fully bespoke designs:
Our slimline casement windows are crafted to your exact specifications. Enjoy complete control over frame colour and finish, opening style, handle design, and glazing options (double or triple). Visit our showroom, where our team will guide you through the extensive possibilities for your property.
Unrivalled warranty:
We stand by the quality of our installations with a 10-year guarantee, providing long-term peace of mind.
Based in Market Deeping, our experienced and dedicated team at Klosen is ideally situated to supply slimline aluminium windows throughout Rutland, Cambridgeshire, Lincolnshire and London. Being local means we’re always readily available to assist you. You’re also welcome to explore our window designs firsthand at our showroom before making your final selection.
Choosing Klosen provides you with a supportive partnership and convenient access to our expertise. We bring over 25 years of expertise to every one of our projects!
We are an Assure-accredited installer and regularly update our training to ensure that our engineers are offering the finest results for your slimline casement window installations.
Want to see examples of past slimline casement windows that we’ve installed? We’ve included a sample of some of the projects we’re proud to have worked on.
The time it takes to complete a casement window installation varies depending on the complexity. It can often depend on the size of the window. Generally speaking, however, smaller windows can be installed in just an hour or two. Larger ones may take four hours or longer to fit. We always prioritise offering an efficient, swift installation while ensuring the highest quality finish.
How far you can open your casement window will depend on the type of hinge you have. The maximum they can open is 90 degrees, although some hinges with a smaller opening of 45 degrees. Our team can finalise the smaller details to ensure you have the casement windows that work for you and your home.
At Klosen, we supply casement windows with widths of 1500 mm and provide made-to-measure designs to suit your property.
