Flat Roof Windows & Rooflights | Aluminium Frame

Smart Silver Rooflights – Premium Flat Roof Windows

Bring more light into your home or commercial space with our sleek, high-performance flat roof windows. At Direct Trade Windows, we supply and install the Aliver Rooflight flat roof window system by Smart—an elegant, fixed flat glazing system that blends minimalist design with practical performance. Whether you're creating a bright kitchen extension, enhancing a flat-roofed office space, or adding natural light to a hallway or atrium, our flat roof windows offer a refined solution with a modern architectural finish.

With their clean sightlines, marine-grade aluminium construction, and seamless integration, the Aliver Rooflight flat roof windows complement both traditional and contemporary properties. Installed by our experienced team and built to last, they’re a dependable option for clients who value thermal performance, light transmission, and understated design. Combine our flat roof windows with our range of aluminium windows or sliding doors for a cohesive, high-spec finish to your glazing package.

Why Choose Our Flat Roof Windows?

? Modern, unobtrusive design: Complements any architectural style

? Made to measure: Manufactured in-house for precise fit and seamless installation

? Perfect for flat roof windows in extensions: Kitchens, lofts, hallways, commercial spaces, and more

? Compatible finishes: Match with windows and doors in any RAL colour

? Expert installation: Delivered and installed with full technical support from our team

Modern rectangular skylight window for natural light.

Technical Specifications
Colours & Finishes

Technical Specifications

Type: Fixed flat rooflight for residential and commercial applications
Frame Material: Slimline aluminium with concealed fixings
Thermal Performance: U-value of 1.4 W/m²K using 1.0 W/m²K centre pane glazing
Glazing Options: Suitable for 28.8mm to 29mm double or triple glazed sealed units
Noise Reduction: Enhanced acoustic insulation through sealed glazing design
Installation: Fast and simple with replaceable glazing unit (frame remains in place)
Finish: Marine-grade powder-coated aluminium in single or dual RAL colours
Rectangular Size Limits: Max Length: 2000mm | Max Width: 1000mm
Square Size Limits: Max Width & Length: 1500mm x 1500mm
Standards Compliance: Glazing must meet BS EN 1991-1-1 & CWCT standards (TN61–TN69)

Glass Options for Flat Rooflights

Glass specification varies by project. We work with your requirements to select the optimal glazing — balancing thermal performance, solar control and aesthetics for your flat rooflights. Speak to our specification team for recommendations tailored to your project.

Colours & Finishes

Frame & Finish Options

Roof lanterns and rooflights are most commonly specified in anthracite grey (RAL 7016) or jet black (RAL 9005) to complement contemporary flat-roof extensions.

Anthracite Grey (RAL 7016) — The most popular choice, complementing contemporary flat-roof architecture
Jet Black (RAL 9005) — Bold, dramatic finish for modern extensions
Pure White (RAL 9010) — Clean, classic finish for traditional properties
Any RAL Colour — Full RAL Classic palette available to specification
Dual Colour — Different internal and external frame colours available on all products

Powder coating is applied in-house to marine-grade standards, with a minimum 25-year colour guarantee and resistance to fading, chalking and corrosion.

Flat Roof Windows FAQs

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What are Flat Roof Windows, and where are they suitable?

Flat Roof Windows are sleek, modern windows that bring subtle lighting and minimalist design to various spaces. They are suitable for both residential and commercial use, including orangeries and conservatories.

What are the key features of your Flat Roof Windows?

Our Flat Roof Windows offer matching designs in bronze, silver, red, blue, and green options. Thanks to in-house manufacturing, we provide quick lead times, and they have excellent energy efficiency with U-values as low as 1.4 W/m²K.

Tell me about the Smart Aliver Rooflight System.

The Smart Aliver Rooflight System is a high-performance, high-quality fixed flat roof solution. It features an elegant aluminium frame, concealed fixing system for easy installation, and the ability to replace the glazing unit without removing the frame.

What are the size options for Flat Roof Windows?

Our Flat Roof Windows come in rectangular and square options. The rectangular windows have a maximum length of 2000mm and a maximum width of 1000mm, while the square windows have a maximum length and width of 1500mm.

How do Flat Roof Windows contribute to energy efficiency?

Flat Roof Windows offer excellent energy efficiency with a U-value of 1.4 W/m²K. The thermally-broken aluminium profile and double glazed units provide thermal insulation, making them an energy-efficient choice.

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