Whether you’re scoping work for an extension or upgrade to your property, Klosen offers bespoke slimline black aluminium windows. Request your quote from us and download our brochure to see the transformative design opportunities that await.
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 black aluminium windows are ideal for contemporary new builds or extensions. They are designed with the latest insulation, energy efficiency and security requirements. Black slimline windows have significantly slimmer frames and larger glass panes compared to uPVC windows. This results in a refined, modern aesthetic that maximises natural light and enhances outdoor views.
We work with brands we trust, including Cortizo, Senior Architectural Systems and Origin. All offer exceptional quality black aluminium frames and glass panes that are made-to-measure and fully customisable.
As we work with multiple trusted brands, we provide the beauty of choice. Our range includes casement, fixed, bi-fold, flush and tilt and turn windows. Whether you want a picture window on a stairwell or landing, or you want to let in the light, fresh air and uninterrupted views with a bi-fold window, we can make that happen—and all made-to-measure to suit the architecture of your property.
To get a feel for the effect that black slimline windows provide, we recommend exploring our projects and case studies.
Black aluminium slimline windows can offer a stunning, contemporary finish for a property. With slimmer frames and larger glass panes, they enhance views and natural light while providing exceptional thermal and noise insulation.
Thanks to the polyamide thermal break, these windows improve home insulation and energy efficiency, leading to lower energy costs and a naturally warmer home in winter.
Black aluminium frames also last longer than wood or uPVC, even with minimal maintenance, making them a robust, futureproof upgrade for a modern property.
Browse our brochure for design ideas and discover how we can enhance your property.
With 25 years of experience, our dedicated team ensures exceptional standards in every project. Homeowner satisfaction is paramount, both in the final product and our service. What distinguishes us from other slimline black window suppliers is our commitment to fully bespoke designs, providing a unique and high-quality finish.
Customer satisfaction with the final outcome is our priority, which has established us as a reputable name locally. Our installation expertise was even featured on Channel 4’s Grand Designs and the Abba Arena in London.
We ensure a swift and hassle-free installation, keeping you updated at every stage. This allows you to focus on other aspects of your renovation, new build, or extension.
Our contemporary black slimline window installations offer a unique level of customisation. You have complete control over the finer details, from selecting the opening mechanism and handle design to choosing between double or triple glazing. This freedom allows you to custom-build windows that perfectly suit your needs.
Our commitment extends beyond the initial installation. We provide a comprehensive 10-year guarantee on all installation work, offering you long-term peace of mind and assurance in the quality of our workmanship.
Discover for yourself why we’re trusted by homeowners and architects across the East of England.
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!
Our service area:
Our Assure-accredited team is conveniently located to supply slimline aluminium windows in Rutland, Cambridgeshire, Lincolnshire, and London.
Local expertise & accessibility:
As a local company, we are available to help. You can also see our window designs up close at our showroom in Market Deeping, Lincolnshire.
Commitment to quality:
We regularly update our engineers’ training to guarantee the best possible results for your slimline black aluminium window installations.
Request a quote from us today, and we’ll be in touch soon.
For examples of our completed slimline black aluminium window installations, we’ve included a selection of projects we are proud to have been a part of.
With Klosen, you can choose from a wide range of frame colours, so you don’t have to paint them yourself. Black is one of our most popular options, along with white and grey. However, we also cater to property owners who have a taste for pastels or bolder colours.
Your black aluminium frames should only require a thorough clean a couple of times a year. Clean the frames with a soft cloth and soapy water. Dry the frames with a soft, dry cloth. To lift dirt or moisture from the corners, we recommend using cotton buds. Refer to our guide to cleaning aluminium windows for more tips and tricks.
While black aluminium frames can fade or corrode over time, the process is slower than other materials, such as painted wooden frames or uPVC frames. The frame’s protective powder coating from Klosen is less susceptible to corrosion or fading and comes with a 25-year warranty for your peace of mind.
Our Market Deeping showroom is open Monday to Friday, and you’re welcome to visit us to see our range of slimline black aluminium window designs and brands. Our team will be available to answer your questions about upgrading and installing your new windows.
