SLIM LINE STEEL DOORS & WINDOWS

Slim Steel Doors & Windows for MODERN Interiors

Engineered with genuine steel our slim line steel doors combine sightlines with exceptional structural strength. The inherent rigidity of steel allows for narrower 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, with fire-rated solutions from E30 up to E120 where required.

The result is a contemporary internal door system that offers precision, performance, and long-term reliability without compromising on design.

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Introduce ARTFUL Design into Your Home

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R-Secure slim doors are a striking addition to any interior, bringing clean geometry and confident definition to a space. They complement carefully refurbished period properties as beautifully as modern loft-style apartments, adding structure, contrast, and architectural interest. With their ultra-slim steel profiles and minimalist detailing, they enhance the character of a room while allowing natural light to flow seamlessly between spaces.

Enhance LIGHT and Openness Within Your Interiors

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Do your rooms feel enclosed or lacking natural light? Slim line steel doors offer an elegant solution for brightening darker living areas or office spaces while maintaining clear separation between rooms. Thanks to ultra-slim steel sightlines, they maximise the glazed area, allowing natural light to travel deeper into the interior. The result is a brighter, more open environment achieved through refined steel framing that feels clean, structured, and visually unobtrusive.

FIRE Rated

Fire-rated internal doors play a critical role in protecting both property and lives. In residential buildings, apartments, and commercial environments, fire compartmentation is a key safety principle designed to slow the spread of fire and smoke, allowing occupants more time to evacuate and helping emergency services control the situation.

Unlike standard internal doors, fire-rated steel systems are tested to withstand fire exposure for a specified period. Ratings such as E30, E60, E90, and up to E120 indicate the number of minutes the door assembly can maintain integrity against fire under certified test conditions.

This is particularly important in:

• Apartment entrances and corridor separations •
• Office partitions and shared commercial buildings •
• Stairwells and protected escape routes •
• High-occupancy or multi-unit properties •

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 can deliver both safety compliance and refined aesthetics without compromising the clean, glazed industrial look.

Choosing a certified fire-rated internal door is not only about meeting building regulations; it is about creating safer spaces with engineered performance built into the design from the outset.

Frequently asked questions (FAQ)

Why are slim line steel doors often referred to as “Crittall-style” doors?

“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.

Are your slim line doors comparable to W20, W40 or W50TB steel systems?

Yes — we can supply slim line steel solutions that align with common W20 / W40 / W50TB-style requirements depending on profile depth, glazing, and performance needs.

What is the difference between W20, W40 and W50TB profile types?

These typically refer to different profile depths and performance capabilities. The right choice depends on your opening sizes, glazing specification, and whether Fire / acoustic performance is required.

Do you offer genuine steel systems rather than aluminium alternatives?

Yes — our slim line internal doors are manufactured using steel profiles to achieve true rigidity, slim sightlines, and long-term durability.

Can you supply FD30 fire-rated slim line steel doors?

Yes — we can supply FD30 options where required, subject to the final configuration, glazing choice, and certified system specification.

Why is a Fire rating important for internal doors?

Fire-rated doors help slow the spread of fire and smoke, protecting escape routes and giving occupants more time to evacuate — especially in apartments, multi-occupancy buildings, and commercial spaces.

What Fire ratings are available for slim line steel internal doors?

Fire performance depends on the chosen certified system and build-up. We can advise the correct specification for your project and required rating (including FD30 where applicable).

How do I request a quote for a W20 / W40 style steel door system?

Send us your opening sizes, preferred layout (single/double/fixed screens), glazing type, finish colour, and whether Fire (FD30) is required. We will confirm details and provide a quotation.

Ready to discuss your project?

Whether you are exploring options or have defined specifications in place, we’re here to guide you through the next step. Book a consultation or request a tailored quote to discuss security, performance, and finish in detail.

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