Slim Steel Windows & Steel Doors
For Irish Homes and Architectural Projects
At Colin’s Sash Windows Ireland, we proudly manufacture and supply premium slim steel windows and steel doors designed to complement both heritage restorations and modern architectural builds.
Unlike conventional aluminium systems, our high-strength steel allows for taller and wider glazing with ultra-slim sightlines, giving your property an elegant and light-filled appearance without compromising structural integrity.
Each system delivers exceptional thermal insulation, lasting durability, and architectural precision trusted by homeowners, designers, and architects across Ireland.
Talk to our experts today to discuss your project and receive a tailored quotation.
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External Steel Doors
Key Product Features
- Ultra-slim sightlines: Achieve a refined minimalist look with frame widths as narrow as 25 mm.
- Thermally broken profiles: Advanced warm-edge performance for year-round energy efficiency.
- Precision-engineered steel: Supports large glazing panels while maintaining slim frames.
- Flexible opening configurations: Inward or outward opening, single or double doors, arched or shaped frames.
- Security options: Mortise or multipoint locks for superior protection.
- Tested performance: Fully compliant with EN 14351-1, meeting European standards for air, water, and wind resistance.
- Glazing compatibility: Accepts double or triple glazing up to 47 mm.
Technical Specifications
When Professional engineering meets architectural precision.
Face width (fixed glazing)
~25 mm
Face width (doors)
~25 mm
Frame depth
60 mm
Max door leaf size
Up to 1250 × 2500 mm (150 kg)
U-value
Approx. 1.5 W/m²K (doors) / 0.8 W/m²K (windows)
Sound insulation
Up to 45 dB
Air permeability
Class 4
Water tightness
Class 8A
Certification
CE-marked – EN 14351-1
Values may vary based on configuration and glazing selection.
Materials and Finishes
Our steel systems are available in a wide range of finishes, ensuring the perfect match for both
traditional and contemporary Irish properties.
1. Steel
Powder-coated in any RAL colour for long-lasting protection.
2. Stainless Steel
Excellent corrosion resistance for coastal areas such as Galway or Dublin Bay.
3. Corten Steel
Develops a natural patina for an industrial or rustic aesthetic.
Colour options: full RAL palette and custom finishes available.
Hardware: minimalist handles, concealed hinges, and multipoint locking available.
Applications Across Ireland
Designed to complement every type of Irish project — from heritage restorations to cutting-edge architecture.
Benefits at a Glance
Maximum Daylight
Ultra-slim profiles allow maximum natural light through
Superior Thermal Insulation
Energy-efficient living for year-round comfort
Outstanding Durability
Exceeds aluminium and timber system lifespan
Consistent Design
Seamless integration across windows, doors, and partitions
Low Maintenance
Exceptional lifespan with minimal upkeep required
Irish Climate Ready
Perfect for Irish weather, offering comfort and style year-round
Our Gallery
Get Inspried
We’ve supplied our external steel doors to homes and real estate developers across Ireland. See our gallery to explore recent deliveries, finishes and real installations from our happy trade customers.
Specification & Installation
All products are manufactured and installed by experienced steel specialists with precision craftsmanship.
Glazing options: Clear, acoustic, solar-control, or decorative glass available.
Accessibility-friendly: Options for threshold-free entry and inclusive design.
Corrosion protection: Full galvanisation and powder-coating on every system.
Architectural resources: BIM and CAD files available upon request.
Nationwide supply and installation across Ireland.
External Steel Doors Cost
Slim steel external doors and matching windows are bespoke, premium systems — tailored to each project’s specification, size, and finish.
Single External Door
From €4,100 + VAT
Fully glazed, thermally broken, powder-coated, supply only.
- Premium steel construction
- Thermally broken profile
- Powder-coated finish
- Supply only
Double Doors or Large Glazed Screens
From €5,800 - €9,300 + VAT
Custom size and finish, premium steel construction.
- Bespoke sizing available
- Premium steel frames
- Custom finish options
- Large glazing panels
Matching Steel Windows
From €1,400 + VAT
Complement your doors with matching window systems.
- Per unit pricing
- Consistent design aesthetic
- Multiple configurations
- Premium quality
Installation, delivery, and project location may affect final pricing. Quotes are prepared
individually based on design drawings and specifications.
Why Choose Our Slim Steel Systems
Our slim steel windows and doors combine heritage craftsmanship with modern
engineering, offering unmatched strength, style, and efficiency. Whether it’s a
listed townhouse in Dublin, a modern extension in Cork, or a coastal property in
Galway, these systems elevate both performance and design integrity.
Perfect balance of heritage charm and modern performance.
Exceptional craftsmanship meets cutting-edge technology.
Engineered to withstand Irish weather conditions.
Ready to Discuss Your
Project?
Contact our team for technical guidance or a project-specific quotation.
Serving homeowners, architects, and builders throughout Ireland with premium slim steel window and door systems.
