Where Heritage Meets Innovation
Authentic steel aesthetics without compromising on modern
thermal performance.
The Ultimate Solution for Strength and Style
We’ve had tremendous success with our steel-look aluminium doors and windows, but aluminium has natural limits when it comes to larger, more durable external openings.
That’s why we developed our double-glazed, slim external steel doors and windows — combining timeless elegance with exceptional outdoor performance. Designed for heritage refurbishments, extensions, and modern façades, these steel systems feature ultra-narrow sightlines, high structural strength, and advanced thermally broken insulation for all-season comfort.
Available in a range of materials and finishes, our external steel doors deliver the authentic steel-look aesthetic while meeting today’s energy efficiency and acoustic standards for residential and commercial projects across the UK and Ireland.
Key Features
Ultra-slim profiles
Minimal sightlines as narrow as 25 mm for fixed glazing.
Thermally broken system
Warm-edge performance for year-round comfort.
High-strength steel construction
Enables large glazed areas and slim frames.
Lock options
Mortise or multipoint.
Glazing flexibility
Supports double or triple glazing up to ~47 mm.
Performance certified
Tested to European standards for air, water, and wind resistance.
Compatible windows and doors
Unified system for consistent design.
Custom configurations
Inward/outward opening, double doors, shaped or arched frames.
Technical Specifications
Actual performance may vary by configuration, glazing, and hardware selection.
Hardware and Finishes
Colour options: full RAL palette and custom finishes available.
Hardware: minimalist handles, concealed hinges, and multipoint locking available.
Steel
Stainless Steel
Corten Steel
Applications
Benefits Summary
Maximum daylight with narrow frame profiles.
Thermally efficient steel system for comfortable interiors.
Exceptional durability compared to aluminium or timber.
Suitable for restoration or new construction.
Unified aesthetic across windows, doors, and partitions.
Low maintenance and long lifespan.
Specification & Installation
Every detail matters. From expert fabrication to professional installation, we ensure your steel systems are delivered to perfection.
Expert Fabrication
Fabricated and installed by experienced steel door specialists with years of craftsmanship.
Universal Design
Compatible with threshold-free and accessibility designs for inclusive architecture.
Design Resources
BIM and CAD files available for architects and designers to seamlessly integrate into projects.
Glazing Excellence
Glazing options from clear to acoustic or solar control glass to suit any project requirement.
Premium Protection
Finish preparation includes full galvanisation and powder coating for corrosion protection.
Professional Installation
Nationwide installation service with precision fitting and full project support.
Why Choose Slim Steel Systems
When authentic steel design meets modern performance standards.
Authentic Steel Aesthetic
Genuine steel construction delivers the slim sightlines and industrial elegance that aluminium simply cannot replicate.
Superior Strength
High-strength steel enables larger glazed areas with minimal framing, perfect for expansive views and architectural statements.
Built to Last
Exceptional durability and corrosion resistance ensure decades of performance with minimal maintenance required.
Thermally Efficient
Advanced thermal breaks deliver outstanding insulation performance, keeping interiors comfortable year-round.
Heritage & Modern
Equally suited to listed building restorations and cutting-edge contemporary architecture.
Expert Installation
Fabricated and installed by experienced specialists who understand the precision required for steel systems.
Transparent Pricing for Premium Quality
Slim steel external doors and matching windows are premium, bespoke products. All
prices shown are + VAT. Installation, delivery, and site location may affect the total cost.
Single External Door
From £3,500
Fully glazed, thermally broken, powder-coated, supplied only
- Premium slim steel frame
- Thermal insulation
- Powder-coated finish
- Custom sizing available
Double Doors & Glazed Screens
£5,000 - £8,000
Depends on specification, finish, and glazing type
- Bespoke configurations
- Multiple glazing options
- Custom finishes
- Enhanced thermal performance
Matching Steel Windows
From £1,200
Per unit, complementing your steel door system
- Coordinated design
- Various sizes available
- Premium glazing
- Weather-resistant
