Flat roof extensions

Flat roof extensions can provide a simple, cost-effective solution that ticks all the right boxes, especially for many smaller extensions. The comparative ease of constructing flat roof extensions and their discreet visual impact are appealing to a lot of homeowners. Flat roofs also offer the perfect canvas for lanterns and skylights.

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A versatile roof choice

Flat roofs are suitable for a wide range of extensions. They can be installed into conservatories, orangeries, and even garage conversions. Wherever you envisage your flat roof extension, at Global Windows, we can help you to choose the best solution for your home renovation project.


Why add a roof lantern to your flat roof

We use the Ultraframe Ultrasky lanterns on flat roof projects which can come as pitched or flat. As the name suggests, a roof lantern will help to light up a glazed or brick built extension with a flood of natural light. Natural light from the sun is known to boost our mood and create a feeling of well-being. With a roof lantern from Global Windows, the benefits are more than aesthetic.

The versatility and superb functionality of roof lanterns has made them a hit with UK homeowners. Many people are now choosing them as the perfect conservatory roof replacement. Stylish in design, with excellent levels of thermal efficiency, it’s perhaps no surprise that their popularity has soared in recent years.

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  • Materials
  • Energy efficiency
  • Security
  • Glazing
  • Features
  • Materials

    A GRP flat roof, or fiberglass roof as it's also known, is one of the most popular flat roofing solutions in the UK. GRP stands for Glass Reinforced Polyester, a composite material formed by strengthening plastic with fine fibres made of glass. We use a system called Topseal and we are trained installers of their product.

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    Energy efficiency

    Energy efficiency is an important consideration for all homeowners. We all want to reduce our carbon footprint and help to protect the environment for future generations. There are many ways to do this, by regularly recycling and reducing our waste. You can also help by choosing the most energy efficient products for your home improvement projects.

    All our flat roofs are ‘A’ rated for energy efficiency as standard. They will help to create a warmer home and save you money on reduced heating bills.

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    A rated roofs and glazing


    Home security is perhaps the most important factor when you want to improve your home. At Global Windows, we share your concerns which is why we never compromise on the safety and security of our products. The products we install undergo rigorous testing to ensure they meet the high security standards the industry demands.

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    Roof lantern overview


    If you decide to add a skylight or roof lantern to your flat roof, our Celsius Elite glazing has a blue tint and is easy to clean, providing the best heat regulation on the market. Choose from clear, coloured, bevelled, patterned, and textured glass sections for your new conservatory roof. Choose the perfect glazing to match your property’s style and your own tastes.

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    Global Lang News


    At Global Windows, our products have a wealth of high quality features. When it comes to choosing the best windows, doors, and glazed extensions, you’ll be spoilt for choice. From glazing to frames, we offer an array of options on all our product range.

    • No hassle quick installation design
    • Suitable for all types of property
    • Can be used all year round
    • ‘A’ WER (Window Energy Rating) as standard
    • Bright and airy interior design
    • Excellent ventilation capacity
    • Excellent weather resistance
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    White orangery with roof lantern