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Window extensions

Flat Rooflight Window Sizes

VELUX, ECO+, Signature, FAKRO, REAL, Korniche & Sterlingbuild rooflights by size

Use our handy chart to shop for your flat roof windows by size. We only supply stylish, high performance rooflights from brands we trust, including VELUX, FAKRO, ECO+ and Korniche, as well as our own brand of industry leading specs. Many products are in stock for next day delivery, or enjoy free delivery for orders over £100. Don't forget - our price match promise guarantees you are getting the perfect fit for the best price online.

If you cannot find the size you need in our size guide, we offer a bespoke, made to measure service on several of our products, including all of our Signature rooflights and Korniche lanterns. Using the service is easy, simply fill out a bespoke form and send it to us in an email or you can contact one of our sales team who will happily walk you through the process.

For pitched roof windows, use our roof window size guide to find the perfect match for your home extension. Our roof window guide also includes a chart for skylights to assist you in buying for uninhabited attics, sheds, garages and other outbuildings.

*‌Signature rooflights are also available in 75x75, several 110cm (width) sizes, 170x170, 180x60, 230x90 and sizes between 260 and 320 (width)

What's the difference between roof windows, rooflights & skylights?

The biggest difference between roof windows, rooflights and skylights (as the terms are used on Sterlingbuild), is skylights don't meet Building Regulations and so are limited to use in uninhabited spaces, such as lofts and outbuildings.

You can find more information on the Planning Portal. Roof windows are for use on pitched roofs, such as loft conversions. Likewise, rooflights are used on flat roofs, again, for home extensions and public buildings.

Flat roof windows free delivery

Flat Glass Rooflights

We sell an extensive range of flat glass rooflights. You'll find a size to meet any budget, from our pocket friendly ECO+ range (low U-values, great design, next day delivery) to Signature (wide range of glazing and ventilation options). This style of rooflight offers a contemporary finish to your property, adding daylight, insulation and a greater feeling of space.

There are a range of opening styles to choose from. Opening rooflights are available in manual and electric, while fixed rooflights are available if you already have another source of ventilation. Glazing options include double, triple and the impressive quadruple glazed models, along with finishes that include blue and bronze tint to provide privacy and soften sunlight.

And let's not forget walk-on rooflights and floorlights. These amazing flush glass flat windows add daylight to rooms below without losing out on floor space.

Shop for flat glass rooflights

Roof Lanterns

Lantern rooflights will make a huge impact on your space. Like flat glass rooflights, lanterns will flood your room with daylight, but, due to their size and design, roof lanterns open up your roof a lot more. We offer a range of sizes and prices from brands such as Korniche (low U-values, great design) to REAL's state of the art, aluminium lanterns.

Roof lanterns come in fixed and manual operation styles with an option for an electric ventilation system for added air flow. Several glazing options and colour combinations are available. For smaller spaces, pyramid shaped lanterns are a practical choice, giving a fantastic feature to your home.

Shop for roof lanterns

Flat roof lanterns free delivery