Guardian Building Products
Capital Windows Derby is a proud certified installer of all Guardian Products, find about more about each product below
Replace your conservatory roof with a high performance Guardian Warm Roof
If your conservatory is too cold in winter and overheats in summer, a Guardian® Warm Roof is the simplest, most effective way to turn it into a room you can actually enjoy — every month of the year.
Why choose a Guardian Warm Roof?
Warmer in winter thanks to advanced insulation layers
Temperature-regulated in summer, eliminating the greenhouse effect
Adds real value to your property, unlike traditional conservatory roofs
Transforms your conservatory into a fully usable, energy-efficient living space
Fully Building Regulations approved, giving you complete peace of mind
Whether you’re after comfort, efficiency, or a fresh new look, a warm roof gives you all three.
Guardian Home Extension/ Garage Conversions
A complete modern build system, in a fraction of the time.
Guardian Extensions are lightweight, fully insulated systems designed to replace traditional brick-and-block builds. They’re extremely popular across Europe, and it’s no surprise they’re starting to take off here too.
Why homeowners are choosing Guardian Extensions:
Installed in around one-tenth of the time of a traditional masonry extension
Significantly larger internal cubic meterage due to slimmer, insulated walls
Warm, efficient, and comfortable all year round
Fully Building Regulations compliant
Cleaner, quicker, and far less disruptive than a standard build
You get more space, faster, and without the long build schedule, heavy machinery, or weeks of mess.
Guardian Roof Lantern
More light. More height. More space, instantly.
The Guardian Lantern Roof brings a striking architectural feature to any extension, kitchen, or open-plan living space. With slim sightlines and high-performance glazing, it delivers daylight, warmth, and style in equal measure.
Key benefits of a Guardian Lantern:
Fast installation, goes up far quicker than traditional lantern roof systems
Greater internal cubic meterage thanks to its clever structural design, giving your room a more spacious, airy feel
Slim, modern aluminium frames for maximum light
Fully Building Regulations approved
Perfect for kitchens, dining rooms, garden rooms, and new extensions
A Guardian lantern doesn’t just brighten a room, it completely elevates it.