Steel frame internal doors and their practice applications

• 28 February 2025
• News

Steel frame internal doors offer more than a visual statement. Their structural strength, minimal sightlines and custom-made configurations make them a practical solution for residential and commercial interiors alike.

Crittall Windows’ Innervision range is designed for high performance, longevity, and precise specification. This page outlines how and where these internal doors are typically used, with technical, material and aesthetic considerations clearly explained.

Why Specify Steel Internal Doors?

Steel is stronger and longer-lasting than aluminium or timber. That strength enables narrower profiles, meaning larger areas of glazing without compromising structure or safety.

• High strength-to-weight ratio – slim frames support large glass panels.
• Durability – hot-dip galvanised steel resists corrosion and damage.
• Customisation – size, layout, colours and hardware tailored to project requirements.

These characteristics make steel ideal for light-filled, open-plan interiors where acoustic or spatial separation is still needed.

Where Are They Used?

Residential Interiors

Crittall’s internal doors are common in high-end homes, particularly where design value and flexibility are priorities:

• Home offices – framed glass divides without isolating.
• Kitchens – separates cooking areas while maintaining visual flow.
• Shower rooms – water-resistant and aesthetically minimal.

Commercial Settings

In commercial projects, steel doors offer consistent performance, controlled transparency, and space efficiency:

• Offices – meeting rooms and breakouts remain visible but acoustically distinct.
• Retail – divides departments or zones without interrupting sightlines.
• Hospitality – manages footfall and function while maintaining ambience.

Innervision and Sliding Systems

Crittall’s Innervision internal doors use precision-engineered steel frames and toughened safety glass. They are made to order for each project.

Core Features

• Slim sightlines – minimal obstruction, more light.
• Finish options – powder-coated to any RAL or BS colour.
• Glass choice – from clear to frosted or reeded for privacy and texture.
• Configurations – single, double, fixed panels, or room dividers.

Sliding options are also available. These include:

• Face-mounted or pocket systems
• Soft-close mechanisms
• Flush thresholds for accessibility

See more on sliding door specifications.

Technical Summary

Design Considerations

Steel doors serve more than a visual function. They define zones, control acoustics, and increase light penetration. Unlike partitions or opaque dividers, steel allows separation without full disconnection.

Designers often use them to:

• Introduce light into windowless or rear rooms
• Subtly divide open-plan layouts
• Retain heritage feel while improving practicality

Sustainability and Longevity

Crittall internal doors are made in the UK using recycled steel. The material can be recycled indefinitely without loss of strength. Combined with long product life and minimal maintenance, this gives a low embodied carbon over time.

So Who Are Internal Steel Doors For?

Steel frame internal doors are best suited to:

• Architects working on high-end residential or heritage projects
• Developers requiring consistent, durable interior glazing systems
• Designers prioritising light, clarity, and customisation

Their longevity and aesthetic value make them a strong return on investment for both commercial and residential properties.

Need technical advice or a quote? Contact the Crittall team to discuss sizing, finishes, or project requirements.