Windows
Slim Steel Windows & Doors: the Crittall-Style Look
About Slim Steel Windows & Doors
Slim black frames divided by fine glazing bars are what most people mean by Crittall-style glazing: the industrial steel windows of the early twentieth century, now used for kitchen extensions, internal screens, loft conversions, restaurants and office fit-outs. We supply and install the look in genuine thermally insulated steel, using the Jansen Janisol Arte 2.0 system for windows, doors and sliding doors. Steel is stiff enough to keep its face widths to around 40 mm while carrying insulating glass units of 20 to 34 mm, and Janisol Arte sliding units can reach 3,000 by 2,500 mm with leaves of up to 150 kg, subject to configuration. Where a screen or door also has to resist fire, Jansen Janisol 2 is tested to EI30, so a fire door can share the same slim steel look as the glazing around it. The photographs here are from our Pavilion project in London, which shows the style: long runs of slim black glazed doors and screens with glazing bars opening onto a garden terrace. Each opening is drawn, fabricated and installed to measure, and we will advise on whether steel or a slim aluminium system suits the budget and performance needed.
Last reviewed 10 October 2026
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Key features
- Genuine thermally insulated steel (Jansen Janisol Arte 2.0)
- Slim face widths of around 40 mm
- Windows, hinged doors, sliding doors and glazed screens
- Glazing bars to suit heritage or contemporary designs
- Insulating glass units from 20 to 34 mm
- Fire rated steel doors and screens to EI30 (Jansen Janisol 2)
- For homes, restaurants, offices and internal partitions
- Made to measure and installed by our teams
Specifications
Frequently asked questions
Common questions about Slim Steel Windows & Doors.
Do you supply and install Slim Steel Windows & Doors?
Yes, BDF Architectural offers full supply and installation across London and the South East, from survey through to completion. Supply-only is also available if you have your own installer.
Can Slim Steel Windows & Doors be made to measure?
Yes. Everything we supply is made to your exact sizes, for standard and non-standard openings alike, so there are no stock sizes to work around.
What colours are available for Slim Steel Windows & Doors?
A wide range of powder-coated finishes including anthracite grey, white, black and dual-colour options. Any RAL colour is available on request.
What warranty comes with Slim Steel Windows & Doors?
Warranty terms depend on the system and finish, and we confirm them in writing with your quote.
How long does installation take?
It depends on the size and number of openings. We give you a clear timeline when we survey and quote.
How do I get a quote?
Quotes are free. Fill in the contact form, use the Free Quote button, or call us on 0800 999 5575, and we will arrange a survey at a time that suits you.
Interested in Slim Steel Windows & Doors?
Get a free, no-obligation quote tailored to your project.
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