At Steel Door Company, we specialise in crafting and supplying bespoke steel windows that combine architectural beauty with long-lasting performance. Trusted by architects, builders, and discerning homeowners, our expert team works closely with clients to deliver window systems that enhance both modern and heritage properties. With a commitment to precision engineering, premium materials, and tailored support, we’re proud to be one of the UK’s leading suppliers of high-performance steel glazing solutions.

Forster Thermally Broken (Unico)

• Recyclable steel, certified for fire, sound and security
• Uw as low as 1.4 W/m²K
• Supports sash weights up to 150 kg
• Available in fixed and opening configurations

Forster Unico XS

• Ultra-slim profile (~55 mm face width)
• Glazing up to ~60 mm
• Uw values as low as 0.9 W/m²K
• Ideal for large-format, modern windows

Ottostumm Window Systems

W20 – Heritage (Non-Thermal)

• Slim, hot-rolled solid steel construction
• Overlapping sightlines for a classic look
• Compatible with single or slimline double glazing
• Available in fixed and operable formats

W40 – Traditional + Modern

• Accepts double or triple glazing
• Optional architectural bronze finish (B40)
• Ideal for upgrades in heritage or period properties

W50 TB – Thermally Broken

• Glazing up to 38 mm
• Uw value approx. 1.0 W/m²K
• Maintains slim traditional sightlines

W75 TB – High-End Performance

• Glazing up to 52 mm
• Available in steel, bronze, or Cor-Ten
• Exceptional acoustic and thermal insulation

Famanuac Windows

• Cold-formed steel construction
• Highly flexible in layout and configuration
• Single or double-glazed options
• Fully bespoke design and finish options available