Internal & Architectural

Slim Line Steel Doors & Windows

Genuine steel frames with ultra-slim sightlines. The classic industrial-style aesthetic, engineered for modern living.

Artful Design Meets Structural Integrity

Engineered with genuine steel, our slim line doors combine narrow sightlines with exceptional structural strength. The inherent rigidity of steel allows for slimmer profiles and larger glazing panels, delivering a refined industrial aesthetic while maintaining durability and stability.

Available in a wide range of profile depths and configurations, these doors can be tailored to suit private homes, apartments, offices, and commercial environments. Multiple glazing options are available, including clear, reeded, tinted, and specialist glass.

Slim line steel doors with fire-rated glazing

Safety Built In

Fire-Rated Options

Fire-rated internal doors play a critical role in protecting both property and lives. In residential buildings, apartments, and commercial environments, fire compartmentation slows the spread of fire and smoke, allowing occupants more time to evacuate.

Our slim line steel systems are available with fire-rated glazing from E30 up to E120 where required. Steel is especially well-suited for fire-rated applications due to its structural stability at high temperatures. Combined with approved fire-resistant glazing and specialist seals, slim line steel systems deliver both safety and refined aesthetics.

Particularly suited for apartment entrances, corridor separations, office partitions, stairwells, and protected escape routes.

Configurations

Tailored to Your Space

Available in single doors, double doors, fixed side screens, room dividers, and full partition walls. R-SECURE supplies W20, W40, and W50TB profiles depending on depth, glazing, and performance needs.

Detail of reeded textured glass behind slim matte-black steel slim line steel mullions
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Glazing Options

Clear, reeded, tinted, fluted, and specialist glass. Fire-rated glazing where specified.

Slim steel profile system in a dark RAL finish
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Finishes

Any RAL Classic colour. Matt or high gloss. Factory-sprayed for a flawless finish.

Slim line steel doors separating interior living spaces
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Applications

Private homes, apartments, offices, commercial spaces, period properties, and new builds.

Common Questions

FAQ

If you have any further questions, feel free to contact us at info@rsecure.co.uk.

"Crittall-style" is commonly used to describe the classic slim, grid-like steel look. We supply slim line steel doors with that aesthetic, tailored to your layout and specification.

Yes, we supply W20, W40, W50TB profiles (we manufacture these profiles ourselves).

W20. Thinnest profile, no insulation, internal use only, limited glazing options.

W40. Thicker profile, no insulation, internal use only, bigger range of glazing options and fire ratings.

W50 TB. Thickest profile, thermally broken insulation, suitable for external use, more glazing options.

For true external doors we also offer Jansen profile systems such as Janisol Arte 2.0.

Yes. Our slim line internal doors are manufactured using steel profiles to achieve true rigidity, slim sightlines, and long-term durability.
Fire performance depends on the chosen system and build-up. Options range from E30 up to E120, subject to the final configuration, glazing choice, and specification.
Fire-rated doors help slow the spread of fire and smoke, protecting escape routes and giving occupants more time to evacuate. This is especially important in apartments, multi-occupancy buildings, and commercial spaces.
Send us your opening sizes, preferred layout (single, double, or fixed screens), glazing type, finish colour, and whether fire rating is required. We will confirm details and provide a quotation.

Download Our Brochure

Full specifications, patterns, finishes, and technical details. View or download our complete product brochure.

View Brochure

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