Case Study: Brightening a Flat Roof Extension with the VELUX INTEGRA® Solar Curved Glass Rooflight

When our client set out to transform their flat-roof extension, they wanted more than just a window — they wanted light, style, and smart functionality. The challenge was clear: bring in as much daylight as possible while maintaining a clean, contemporary look that performs just as well as it looks.

Flat roofs can often feel dark and enclosed, so finding the right rooflight was essential. The chosen solution? The VELUX INTEGRA® Solar Curved Glass Rooflight (150 × 150 cm) — a premium, solar-powered design that combines effortless functionality with stunning aesthetics.

A Smarter Way to Let the Light In

This next-generation rooflight package includes everything needed for a seamless install:

• CVU 150150 base unit – a solar-powered, double-glazed flat roof window base with laminated safety glass

• ISU 1093 curved glass top cover – designed to shed rainwater easily, even on completely flat roofs

• INTEGRA® Solar operation – wireless, solar-powered control with a VELUX KLI wall switch and built-in rain sensor that automatically closes the window when rain starts

Because it’s solar powered, there’s no need for electrical wiring, making it ideal for retrofit or renovation projects where convenience and sustainability go hand-in-hand.

Design That Performs

What sets the INTEGRA® Curved Glass Rooflight apart is its beautiful curved glass design. The edge-to-edge glass gives a sleek, modern finish from outside, while the hidden sash and slim interior frame allow more natural light to flood the space.

Even better, the curved glass shape isn’t just about looks — it’s highly functional. The gentle curve ensures rainwater runs off easily, preventing pooling and keeping the glass clean, even on roof pitches as low as 0°.

Inside, the rooflight’s insulated PU frame and laminated inner pane enhance both sound and thermal performance, keeping the space comfortable year-round. For added sustainability, the solar-powered operation uses renewable energy to open, close, and respond to weather automatically.

A Brighter, Calmer Space

The transformation was immediate. The new rooflight introduced a beautiful wash of natural light that made the extension feel bigger, brighter, and more connected to the outdoors.

The homeowner was especially impressed by how quietly the window operates — and by the automatic rain sensor that closes it when showers start. It’s one less thing to worry about, especially in unpredictable British weather!

From an architectural standpoint, the glass-to-edge finish adds a crisp, premium look to the roofline, enhancing the overall design while maintaining excellent performance and energy efficiency.

Why It Works

The VELUX INTEGRA® Solar Curved Glass Rooflight brings together smart functionality, modern aesthetics, and high performance in one integrated package. It’s ideal for flat or low-pitch roofs (0–15°) and is perfect for homeowners, architects, and builders looking to add both style and substance to their projects.

Whether you’re upgrading an existing extension or designing a new space from scratch, this rooflight proves that natural light and smart control can coexist beautifully.

Key Benefits at a Glance:

• Curved glass top drains rainwater efficiently, even at 0° pitch
• Slim, edge-to-edge design for maximum daylight
• Solar-powered operation — no wiring required
• Built-in rain sensor for automatic closing
• Excellent thermal and acoustic insulation
• Ideal for flat or low-pitch roofs

If you’re planning a project and want to bring the same light, comfort, and modern design into your home, explore the product here:
VELUX INTEGRA® Solar Curved Glass Rooflight – 150 × 150 cm