Single Internal Steel Doors

Our bespoke single internal steel doors are designed to create elegant transitions between rooms while allowing natural light to flow throughout the space. Manufactured using ultra-slim steel profiles and premium glazing, these doors combine architectural styling with long-term durability for modern and traditional interiors alike. At Steel Door Online, we specialise exclusively in steel framed internal doors and partitions, allowing us to deliver refined steel systems with clean sightlines, accurate detailing, and made-to-measure configurations tailored to each project. Whether you are designing a modern open-plan home, upgrading a hallway entrance, dividing a kitchen space, or creating a dedicated office area, our single steel internal doors provide a timeless and highly versatile solution.

Made-to-Measure Single Steel Doors

Every single internal steel door is manufactured completely to order. We do not supply off-the-shelf systems. Each steel door is individually produced around your opening sizes and preferred layout to ensure accurate proportions and a premium finish throughout. Our single steel doors can be configured with:

• Fixed side panels
• Top glazed panels
• Full-height glass designs
• Horizontal glazing bars
• Heritage-inspired layouts
• Minimal contemporary designs

This flexibility allows the doors to work beautifully across both residential and commercial interiors.

Ultra-Slim Steel Profiles

Our steel doors are manufactured using slim steel sections engineered to maximise glass visibility while maintaining excellent structural strength. Profile specifications include:

• 50mm frame depth
• 20mm visible steel frame width
• 15mm glazing bars

These slim proportions help create the clean architectural appearance that has made steel internal doors one of the most desirable interior features in the UK.

Glass Options Available

All single internal steel doors are supplied single glazed as standard with several glazing upgrades available depending on the level of privacy, acoustics, and styling required. Available glass options include:

• Clear glass
• Reeded glass
• Frosted / opaque glass
• Acoustic glass upgrades
• Laminated safety glass upgrades

Clear glazing remains the most popular choice for maximising natural light, while reeded and frosted glass provide additional privacy for studies, bathrooms, and home offices.

Black Steel Internal Doors and Bespoke Colours

Black steel internal doors continue to be the most requested option, with Black RAL 9005 Matt supplied as standard across most projects. We can also manufacture bespoke steel doors in:

• White
• Bronze
• Grey tones
• Bespoke RAL colours on request

All finishes are professionally powder coated for durability, consistency, and long-term performance.

Ideal Applications

Single steel internal doors are suitable for a wide range of spaces including:

• Kitchens
• Hallways
• Utility rooms
• Home offices
• Dining rooms
• Living areas
• Apartment interiors
• Commercial offices

Their slim steel framing allows rooms to remain visually connected while still creating clear separation between spaces.

Supply Only or Supply & Fit

We offer both supply only and supply & fit services across the UK. Supply only is ideal if you already have your own builder or installer, while our supply & fit service is completed through experienced FENSA-approved installation partners. All steel doors are manufactured to measure with approximate lead times of 8 weeks.

Why Choose Steel Door Online?

Steel Door Online is a specialist division of Colin’s Sash Windows, focused exclusively on steel doors and steel partition systems throughout the UK. We combine specialist product knowledge, made-to-measure manufacturing, and premium architectural styling to create steel door systems designed for long-term performance and refined interiors. ✔ Manufactured in the UK ✔ Made-to-measure steel systems ✔ Ultra-slim steel sightlines ✔ Premium glazing options ✔ Bespoke configurations available ✔ Nationwide supply available ✔ FENSA-approved installation partners ✔ 10-year warranty

Request a Bespoke Quote

Every project is different, which is why all quotations are tailored to your opening sizes, glazing requirements, and preferred configurations. Contact our team today to discuss your single internal steel door project and receive a bespoke quotation.