Steel Casement Doors

The most traditional door style, hinged on the side and able to open inward or outward. With both single and double leaf options, steel casement doors are a versatile option for any entrance.

Design and Aesthetic

  • Thermally broken profiles as standard 
  • A basic depth for thermally broken steel casement doors is between 50-90mm.
  • Slim sightlines

Materials and Surface Finishes

  • Strip galvanised steel (Allowing full range of standard powder coated RAL colour options)
  • Corten steel
  • Stainless steel
  • Marine grade powder coated for for use in marine and coastal environments

Size Limitations

  • Standard leaf sizes for steel casment door are up to 1.4 metres in width and 2.8 metres in height.
  • A steel top-hung window sash may weigh up to 150kg. 

Opening Styles

  • Inward opening (single or double leaf)
  • Outward opening (single or double leaf)
  • Doors with combined side or top lights

Safety & Security Options

  • Steel casement doors are usually come with multi-point locking systems as a standard feature.
  • Security options include burglar resistance classes of RC2, RC3 or PAS24 are available.
  • Laminated glass is chosen for the steel pivot doors requiring extra security.

Glass Specification

  • Steel casement doors can be glazed with double or triple glass units. 
  • Typical double glass option for a steel casement door: Ug-value of 1.0 W/m2K, 28 mm (6/16/6), Toughened glass, Argon filled cavity, and warm edge spacers.
  • Triple glass unit: To achieve better thermal performance (Ug-value of 0.5 or 0.6 W/m2K). 
  • Toughened safety glass: Glass units are built with toughened glass
  • Laminated glass: One pane of glass unit can be built with laminated glass for additional security, safety or noise reduction.

Thermal Performance

  • External steel casement doors are usually constructed with thermally-broken frames to achieve higher thermal performance. Higher thermal performance, indicated by lower Uw-value, is achieved with lower U-values of frame (Uf), glass (Ug), and spacer bars (PSIG). 
  • For replacement in existing residential buildings, steel casement doors must achieve a Uw-value of 1.4 W/m2K or lower to comply with Part L of Building Regulations. ( A minimum Door Energy Rating of Band C  is also acceptable for the glazed doors ( have more than 60% glazed area) or Band B for other doors for compliance.
  • For new residential buildings, glazed steel doors (with greater than 60% glazed area) must have a Uw-value of 1.2 W/m2K, opaque steel doors (with less than 30% glazed area) and semi-glazed steel doors (with 30% – 60% glazed area) must have a Uw-value of 1.0 W/m2K to comply with Part L of Building Regulations. (The maximum allowed value for all doors is 1.6 W/m2K for SAP calculations)

Product range

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Product 2: Coming Soon

Buyer’s Guide to Steel Casement Doors

Steel single-leaf door, inward opening

Steel french casement door

Building Regulations for Doors

All doors installed in buildings must comply with the Building Regulations and meet the specified requirements:

  • Doors to be installed in new or existing buildings must meet energy efficiency requirements contained in Approved Document L.
  • In new residential buildings, easily accessible doors are required to meet the security requirements specified in Approved Document Q.
  • Doors must comply with ventilation requirements specified in Approved Document F.
  • Glazing in critical locations must meet the safety requirements specified in Approved Document K.