Double Glazed Skylights

What Are Double Glazed Skylights?

A double glazed skylight is a rooflight built from two layers of glass held within a factory-sealed unit. The gap between the panes is typically filled with argon gas, which insulates far better than ordinary air. This construction mirrors the principle behind double glazed windows fitted throughout modern homes, bringing the same proven energy-saving benefits to your roof.

Because the inner pane stays much closer to room temperature, heat loss through the glass is greatly reduced. The sealed unit also prevents condensation from forming on the inside surface, protecting your home from damp and mould. For any property in the UK, where weather shifts quickly and winters test building fabric hard, this level of thermal protection is essential, not just a bonus.

If you want even greater insulation, it is worth comparing a double glazed skylight with triple glazing options. Triple glazed skylights add a third pane to the two layers of glass, pushing insulation performance even higher. However, for the vast majority of UK extensions, loft conversions, and kitchen renovations, a high quality double glazed skylight delivers all the efficiency you need at a far more accessible price. 

Visit our help and advice section if you would like guidance on which specification suits your project.

Key Benefits of a Double Glazed Skylight

Choosing a double glazed skylight delivers a range of practical improvements that you will notice from the moment it is installed.

Reduced heat loss - The two layers of glass, combined with an argon-filled cavity, create an insulating barrier that significantly cuts heat loss through your roof. Your home stays warmer for longer without your heating working harder.

Lower energy bills - Better insulation means less energy consumption. A high quality double glazed skylight makes a meaningful contribution to overall home efficiency, especially in single-storey extensions where the roof is a key source of heat loss.

More natural lighs - Skylights flood a room with daylight from above, more even and more effective than light from a vertical window. Brighter rooms reduce reliance on artificial lighting during the day, adding further to your energy savings.

Less noise - The sealed layers of glass also act as a sound barrier, absorbing traffic noise, rainfall, and general outdoor sounds. This is especially noticeable in urban homes or properties near busy roads.

Reduced condensation - The warm inner pane means moisture is far less likely to settle on the glass. This helps protect the area around the skylight from damp, mould, and staining important in bathrooms, kitchens, and loft spaces.

A clean, contemporary finish - Today's double glazed skylights use ultra-slim aluminium frames that complement double glazed windows throughout your home. They add a modern, architectural quality to any room without dominating the space.

Types of Double Glazed Skylight Available from Skyseal

Skyseal's double glazed skylights come in several formats to suit different roofs, budgets, and design goals.

• Fixed flat glass skylights use sealed layers of glass in a rigid, low-profile aluminium frame. They deliver the maximum amount of natural light with no moving parts to maintain, perfect for living spaces, kitchens, and hallways. Browse the full flat glass skylight range.

• Opening flat glass skylights add ventilation alongside natural light. Manual or electrically powered opening options are available, making them ideal for kitchens and bathrooms. Explore our range of flat glass opening skylights for more detail.

• Roof lanterns make a bold architectural statement for extensions and orangeries. Their multi-pane, raised structure floods the room below with natural light from every angle. Explore the roof lantern collection for standard and bespoke size options.

• Dome rooflights offer a cost-effective double glazed skylight solution for garages, utility rooms, and commercial buildings. Polycarbonate domes are durable, lightweight, and built for maximum weather resistance. View the full dome rooflight range.

Not sure which type suits your project? Our made-to-measure service can produce a double glazed skylight built precisely to your dimensions, with your choice of glazing specification.

Installation Tips and Considerations

A double glazed skylight delivers its full benefits only when installed correctly. The most common problems, condensation inside the frame, water ingress, and poor thermal performance at the edges, are almost always caused by poor installation, not a fault with the product itself.

Before ordering, keep these points in mind:

Roof structure and load - Your roof must support the weight of the chosen skylight. This matters most for larger lanterns or any triple glazed unit. If you are unsure, a structural assessment from your builder is a sensible precaution.

Upstand height on flat roofs - The upstand, the raised kerb around the opening, determines how well water drains away. Each Skyseal product includes guidance on the correct upstand height for that model.

Professional vs DIY installation - Many Skyseal products are designed for installation by competent builders or confident DIYers. If you want a clear picture of what is involved before buying, our team is happy to help. Call us on 024 7670 7700 or visit our contact page.

Bespoke sizing - If your opening does not match a standard size, our made-to-measure service builds a double glazed skylight to your exact dimensions with no compromise on thermal performance.