iWindow & Vitria flat roof windows
The new standard in flat glass. Our flat roof windows combine the highest thermal performance with a refined design that blends seamlessly into modern architecture. Available in more than 80 sizes and delivered directly from stock for every new build or renovation project.
iWindow
Extra-insulating flat roof window
Our iWindow range stands for uncompromising quality. With a sleek, compact PVC frame and super insulating safety glass, you achieve Ug values down to 0.5 W/m²K. The result: a timeless design that meets the strictest passive house requirements.
Vitria
Budget-friendly flat roof window
Vitria proves that premium design can be accessible. This flat roof window with double HR++ glazing offers excellent insulation up to 1,1 W/m²K and a modern flush design for flawless water drainage. The ideal step from a plastic dome to the luxury of glass.
Renovation frame
Replace your old dome without demolition work
Upgrade your roof in less than a day. With our universal renovation frame, you can install a modern flat roof window directly onto your existing curb. Without touching the roof covering, you immediately benefit from better insulation and a sleeker look.
Glass
Why choose glass?
Flat glass is the ultimate aesthetic upgrade for your flat roof. In addition to unparalleled transparency, it offers superior thermal and acoustic insulation. Thanks to innovative coatings, you enjoy maximum daylight without your home overheating.
Dealer
Find a Skylux dealer in your region
Your project deserves the best guidance. From our Belgian family business, we work with a network of experts who advise you on the right choice and ensure flawless installation. This way, you are guaranteed years of worry-free daylight.
The iWindow collection
Our iWindow range stands for uncompromising quality. With a sleek, compact PVC frame and super insulating safety glass, you achieve Ug values down to 0.5 W/m²K. The result: a timeless design that meets the strictest passive house requirements.
The Vitria collection
Vitria proves that premium design can be accessible. This flat roof window with double HR++ glazing offers excellent insulation and a modern flush design for flawless water drainage. The ideal step from a plastic dome to the luxury of glass.
Technology meets uncompromising design.
Choosing a Skylux flat roof window means choosing the future. From superior insulation values to an elegant finish that deserves to be seen. Every detail is designed to transform your living comfort.
More than just glass.
Create the perfect daylight entry. Personalize your iWindow with the right finish. Choose opal glass for soft, diffused light and complete privacy. Or opt for solar control glass to keep your home cool during hot summer days, without losing natural light.
A glass upgrade. Plug & Play.
Replace your old plastic dome with the latest glass technology. Thanks to the Skylux renovation frame, you can transform your roof without touching the existing roof covering. Faster, more durable and immediate results.
Complete your living comfort.
Expand your iWindow with smart accessories. From sunshade to DuoControl smartphone control – everything for the ultimate living experience under the flat roof.
Compare the models: iWindow2, iWindow3 & Vitria
The right choice depends on your ambitions in terms of insulation and budget. From the unmatched Ug value of 0.5 in iWindow3 to the flawless flush design of the Vitria. Choose based on performance.
iWindow2
The modern standard for every flat roof.
iWindow3
Maximum efficiency for passive houses.
Vitria
Accessible design without compromise.
Insulation (Ug)
1.0 W/m²K
Insulation (Ug)
0.5 W/m²K
Insulation (Ug)
1.1 W/m²K
Glazing
HR++ double glazing
Glazing
HR+++ triple glazing
Glazing
HR++ double glazing
Sound (Rw)
39 dB
Sound (Rw)
41 dB
Sound (Rw)
39 dB
Design
Slim profile
Design
Super insulating
Design
Flush glass surface
Privacy
Clear / Opal
Privacy
Clear / Opal
Privacy
Single Clear
Technical documentation.
Everything for professionals and DIYers. Download installation manuals, technical drawings, and declarations of performance for iWindow and Vitria.
Frequently asked questions about flat roof windows
What is a flat roof window?
A flat roof window is a modern roof window made of flat glass, specially designed for flat roofs. Unlike a dome, it offers crystal-clear views, superior insulation values, and a minimalist look that blends seamlessly into your interior.
What are the advantages of a flat roof window?
Flat roof windows offer maximum daylight, excellent thermal insulation (Ug up to 0.5), and high acoustic insulation against rain and ambient noise. In addition, they increase the value of your home thanks to their sleek, modern design.
What are the disadvantages of a flat roof window?
Because of the flat glass pane, dirt is visible more quickly than on a domed skylight. Skylux solves this with the 'flush design': the glass pane sits slightly higher than the window frame, ensuring natural water drainage and a self-cleaning effect with every rainfall.
What are the insulation values of a flat roof window?
Our flat roof windows are among the best on the market. The iWindow2 offers HR++ double glazing with an insulation value of 1.0 W/m²K, while the iWindow3 with HR+++ triple glazing achieves a passive-house value of 0.5 W/m²K.
What is the acoustic insulation of a flat roof window?
Thanks to the mass of laminated safety glass, the sound of rain and hail is reduced to a minimum. With sound insulation (Rw) of up to 41 dB, you can enjoy absolute silence and peace, even during a heavy thunderstorm.
How much does a flat roof window cost?
The price depends on the size, the type of glazing, and the operation. The Vitria series offers an excellent entry-level price for those wanting to switch from dome to glass, while the iWindow series is the ultimate investment in luxury and energy savings.
What is the best flat roof window?
That depends on your needs. For maximum insulation and passive construction, the iWindow3 is the best choice. For those looking for sleek design at a competitive price, the Vitria is an excellent alternative. Both models offer the Belgian quality that Skylux stands for.
How do I install a flat roof window?
Our windows are delivered ready for installation and often pre-assembled on the curb. Thanks to an intelligent clip system, installation is quick and error-free. We always recommend a roof pitch of at least 5° for optimal water drainage and self-cleaning.
How do I measure a flat roof window?
At Skylux, we always work with the 'clear opening size'. This is the size of the opening in the roof (inside of the curb). Measure the length and width of this opening to determine the correct order size for your window and curb.
Can I replace my old plastic dome with a flat roof window?
Yes, with our renovation frame, virtually any existing dome on a timber, PVC, or concrete curb can be replaced with glass. Without damaging the roof covering, you can transform your old dome into a modern glass roof window.
Where can I view Skylux flat roof windows?
You can discover our products in the showrooms of our official distributors throughout Belgium. Easily find a Skylux expert near you via our online distributor locator for professional tailored advice.