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Double Glazed Flat Roof Windows

Whether you’re sourcing new glazing for your home or you’re tracking down the perfect windows for a new development project, we will have a flat roof window to suit. With an array of brands, styles and finishes on offer, it can be tricky to decide between double and triple glazed models.

While both have plenty of plus points, double glazed flat roof windows are ideal for those seeking a quality product on a strict budget. Featuring a sealed air cavity sandwiched between two panes of glass, double glazed windows offer brilliant insulation. Here are just some of the numerous other reasons why double glazed flat roof windows might be perfect for you…


When you choose double glazing for your flat roof window, you will not only be increasing the natural light levels in your home but also creating an extra layer of protection against the unpredictable British weather. Offering fantastic insulation, double glazed models will help you to maintain a cosy interior all year round.

Double glazed windows like Velux CFP Double Glazed White PVC Fixed Domed Flat Roof Window sit discretely on horizontal surfaces, which makes them an ideal solution for the style-conscious. Their sleek and lightweight design also means they are quick and simple to install. Plus, double glazing also tends to be more affordable than triple or quadruple glazed windows while still allowing you to achieve a warm, bright and well-ventilated interior space.

Our double glazed flat roof windows feature high-quality laminated glass, multi-chambered frames and composite seals to provide excellent thermal performance. The advanced glazing units filter UV rays while allowing plentiful daylight into your home. Customers can choose from a wide range of styles, sizes, and specifications to find the perfect double glazed flat roof window solution for their needs.


At Roof Window Outlet, we stock a plethora of double glazed flat roof windows from four acclaimed companies: Mardome, Fakro, Keylite and Velux. These renowned manufacturers are known for the high-end finish and innovation of their products, meaning no matter which model you select, you will be investing in a premium window that has been thoroughly assessed for safety and durability.

We stock the full range of flat roof windows from each of these brands, enabling us to provide our customers with a fantastic level of choice when it comes to style and price. From manual, fixed and electric operation to domed and flat glass options, our renowned manufacturers cover all bases. Plus, many of our products offer fantastic advancements, including maintenance-free glass, scratch-resistant frames and pre-fitted rain sensors, so you can specify the perfect windows for your project.

In addition, our double glazed flat roof window selection includes models with laminated and toughened safety glass, warm edge spacer technology for thermal efficiency, and secure locking mechanisms. We have standard and bespoke size options to suit any flat roof installation. Our experienced team can assist you in choosing the ideal double glazed flat roof windows for your needs, whether it’s for a home extension or commercial project. We offer a wide range of window solutions to suit any specification, budget or style.


By only stocking products from acclaimed manufacturers, we are able to guarantee our customers that their chosen windows will be of the utmost quality. That is why we are able to provide a full 10-year manufacturer’s guarantee with every purchase. What’s more, many of the models we have in stock are also approved by the likes of the BBA, the FSC, and Secured by Design, proving their superior quality and craftsmanship.

Rest assured that when you purchase your double glazed flat roof windows from us, you will receive an excellent quality product backed by our 10-year warranty. We pride ourselves on sourcing windows only from reputable brands to provide customers with durable and energy-efficient solutions for your projects. We stand behind our products with the highest level of customer service and industry-leading warranties.

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