Customising Your Slimline Windows: Colour, Finish & More
When it comes to enhancing your home or commercial property, the smallest design details can make the biggest difference. At Klosen, we specialise in premium aluminium glazing systems, and one of the most exciting parts of the process is choosing your ideal slimline aluminium window colours.
With a wide palette of RAL shades, durable powder-coated finishes, and even the option for dual-colour frames, your windows can be customised to perfectly complement both your interior and exterior style.
Slimline Aluminium Window Colours: What Are Your Options?
Klosen offers an extensive range of RAL colour options for our slimline aluminium windows and other slimline products. Depending on the system, you can select from over 150 RAL shades, including metallics, black, grey, and pastel tones, all applied using high-quality powder coating for a smooth, long-lasting finish.
For slimline sliding doors, standard colours include RAL 9016 (White) and RAL 7016 (Anthracite Grey), two timeless tones that continue to be among the most popular choices for contemporary properties.
If you’re looking for something unique, Klosen also offers dual-colour options, allowing the interior and exterior frames to differ, ideal for matching indoor décor without compromising the exterior look of your home. Read our guide for more advice on How to Choose the Right Finish for your slimline aluminium windows and doors.
Finish & Durability
Every Klosen aluminium system is professionally powder coated, providing an exceptionally tough, environmentally friendly surface finish. To perfectly match your aesthetic, our standard powder coating is available in three distinct styles: matt, satin, and gloss. This process ensures your chosen colour, whether a bright white, modern grey, or bold black, stays vibrant and highly resistant to fading, corrosion, and weathering.
For bespoke architectural projects, alternative specialised finishes such as anodised and woodgrain are also available upon request. Whichever look you choose, Klosen backs this premium quality with a 10 year guarantee on all aluminium profiles, ensuring your slimline windows look as impressive in a decade as they do on installation day.
Hardware & Colour Matching
For selected aluminium window systems, such as the Origin OW-80 range, Klosen offers colour-matched hardware, allowing you to align handle tones perfectly with your chosen frame shade.
Popular handle finishes include Anthracite Grey (7016M), Jet Black (9005M), and Hipca White (9910G). Handles can also be customised in any RAL colour to match or contrast with your frame choice.
These subtle details create a consistent, professional finish across every element of your glazing.
Most Popular Slimline Aluminium Window Colours
From residential homes to large commercial projects, a few shades have stood the test of time among Klosen customers:
- RAL 7016 (Anthracite Grey): A sleek, modern favourite that pairs perfectly with brick, stone, or render.
- RAL 9016 (White): A clean, crisp option that brightens interiors and suits both traditional and contemporary designs.
- RAL 9005 (Jet Black): Widely used in ultra-modern architecture for bold visual contrast.
These colours highlight the slim, minimalist lines that make aluminium such a desirable choice for today’s design-focused builds.
Discover Your Perfect Finish with Klosen
Choosing your slimline aluminium window colours is more than a design decision, it’s a way to express your home’s personality and architectural style. With hundreds of RAL options, dual-colour flexibility, and long-lasting powder-coated protection, Klosen gives you full control over every detail.
Request a quote or get in touch with the Klosen team today to explore colour samples and discover the ideal finish for your project.
