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Passive Flat Roof Windows

Passive flat roof windows offer the ultimate level of insulation possible.

Whether you’re making improvements to your current property, or you’re seeking the perfect glazing for your client, we have a variety of passive flat roof windows for you.

As well as double and triple glazed models, we also stock a wide range of passive products that will help you achieve the highest levels of thermal performance….

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In order to achieve Passivhaus status, a property must meet numerous energy performance criteria.

But you don’t need to be aiming for passive certification in order to enjoy the benefits of passive windows.

What Are The Environmental Benefits of Choosing Passive Windows?

If you want to lower your carbon emissions, reduce your energy bills, or create an ambient internal temperature all year round, then passive flat roof windows could be ideal for you.

What are passive windows?

Passive windows are thermally broken and feature at least three layers of glass, separated by highly efficient protective gas.

The quadruple glazed windows’ airtight layers provide a fantastic level of defence against heat loss, which will enable you to instantly reduce your energy output – not to mention your utility bills!

As well as boasting extraordinary thermal performance, passive flat roof windows also provide fantastic airtightness, ridding your home of draughts.


At Roof Window Outlet, we stock the full range of passive house windows from Keylite, Velux, and Fakro, three of the best manufacturers in the glazing sector.

These celebrated companies are renowned for the quality and performance of their products, including their passive windows. From quadruple glazed options with flat glass, to velux passive house roof windows, to electric domed models, these suppliers allow us to cater to all styles and budgets.

What’s more, you can also specify numerous custom elements to make your chosen passive roof windows perfect for your needs.

From Anti-burglary toughened glass, to wireless electric systems and even built-in rain sensors, you can make your passive house windows as bespoke, and as innovative, as you see fit.


We’re able to provide a 10-year manufacturer’s guarantee as standard, with every single purchase, since we only sell products that we have complete faith in.

This way you can relax knowing that no matter which product you buy, you’ll be investing in a quality window that will offer exceptional performance for years to come.

What’s more, many of our windows also come with approval from the Forest Stewardship Council (FSC) and the UK’s leading construction certification body, the BBA.

This means you will not only be investing in a quality window, but one that has come recommended by some of the UK’s most respected industry bodies.


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