Steel-Look Alitherm Heritage Doors
At Direct Trade Windows, our steel-look Alitherm Heritage doors from Smart deliver the perfect balance of classic styling and modern performance. Designed to replicate the timeless appeal of traditional steel doors, these aluminium systems feature elegant lines, heritage-style glazing bars, and a refined finish�ideal for period renovations, internal partitions, or contemporary spaces looking for industrial charm.
Engineered with polyamide thermal break technology, Alitherm Heritage doors provide excellent energy efficiency and comply with Document L regulations. Whether used as interior room dividers or secure external doors, they offer robust weather performance, PAS24-certified security, and enduring style�making them a smart and compliant choice for both heritage and modern builds.
Key Features:
- Two design options: 25mm premium slimline bars or 48mm standard for different visual preferences
- Steel-look styling: Traditional appearance with modern performance
- Thermal efficiency: Thermally broken aluminium frames for low U-values
- Weather-tested: Built to BS6375 performance standards
- Secure and accredited: Multi-point locking; PAS24:2016 certified
- Design flexibility: Multiple configurations and glazing options available
- Wide finish range: Choose from RAL colours, dual colours, metallics, and textures
- DDA compliant: Suitable for wheelchair-accessible installations
- Versatile application: Ideal for both internal and external residential or commercial use
Visit our showroom to explore our full range of steel-look aluminium doors and speak with our expert team about finding the right solution for your project.
Our Two Design Options
We offer two steel-look Alitherm Heritage door options to suit different design goals and budgets. Our premium variant features ultra-slim 25mm glazing bars for a more refined, authentic steel aesthetic. Alternatively, the 48mm option offers the same great performance and styling with slightly bolder bars�ideal for a cost-effective, durable solution. Both options are manufactured in-house for quality assurance and are available in a wide range of colours, finishes, and configurations.
25mm Premium Slimline Steel Look Door
Profile width: 25 mm ultra-slim sash
- Aesthetic: Closest match to classic steel with minimal sightlines
- Glazing: Optimised for slimmer double-glazed units
- Best for: Design-led projects prioritising a steel-like look and maximum light
- Performance: High thermal efficiency and PAS24-ready hardware options
48mm Standard Steel Look Door
Profile width: 48 mm standard sash
- Aesthetic: Slightly bolder frame while retaining heritage styling
- Glazing: Accepts deeper/heavier units (incl. higher-spec options)
- Best for: Larger doors or where acoustic/thermal upgrading is a priority
- Performance: Durable, secure, and PAS24-compliant configurations available
Matching arched aluminium windows
When a project specifies steel-look doors with arched window heads, we manufacture both from the same source. See our dedicated range of arched and curved aluminium windows — in-house bending to a minimum 350 mm radius, ±1 mm tolerance, fabricated on the same Fom Industrie equipment as the steel-look door range. Cortizo Cor 70 and Smart Alitherm Heritage profiles available.
