Aluminium Top-Hung Windows

Operated with a handle at the bottom, attached to the window frame at the top with hinges or friction stays, top-hung aluminium windows offer saved space inside, maximum daylight, enough ventilation, and easy operation. Also known as top-guided or awning windows, aluminium top-hung windows are suitable for any type of home.


  • Top-hung aluminium windows are constructed from thermally broken profiles as standard. 
  • They come with a variety of outer frames and sash profiles to meet   different size, design and aesthetic requirements.
  • Aluminium Top-hung aluminium windows are constructed from usually slim profiles. For a standard-size window, the visible sightline (frame+sash) is between 60mm – 100mm. Large size top-hung windows are constructed with thicker profiles. 
  • Aluminium tilt-turn windows can be constructed with visible butt hinges, or concealed friction stays which cost higher. 
  • Aluminium  top-hung windows offer versatility in frame and sash design, allowing for different sight lines and visual styles: standard, classic, steel-look, heritage style etc.
  • Different colour and finish options for profiles: standard powder coated, textured metallic finishes, anodizing finished, etc.

Maximum sizes

  • Standard sash sizes are up to 1.5m at height and 900mm at width. The sash may weigh up to 50kg. 
  • Large size sash sizes are up to 2m at height and 2mm at width. The sash may weigh up to 130kg.

Opening options

  • Top-guided: Constructed with friction stays, when it is opened the hinge slides towards the middle of the window. 
  • Top-guided reversible: It is constructed with friction stays and the window sash can be rotated by up to 170° to allow cleaning from the inside.
  • Top-hung: Constructed with standard butt hinges, and allows for large size top-hung windows.

Glass Specification

  • Aluminium top-hung windows can be glazed with double or triple glass units. 
  • Typical double glass option for aluminium top-hung windows: 28 mm (4/20/4 or 6/16/6), Toughened glass, Argon filled cavity, and Ug-value of 1.0 W/m2K.
  • Triple glass unit: To achieve better thermal performance (Ug-value of 0.5 or 0.6 W/m2K). 
  • Toughened safety glass: Glass units are constructed with toughened glass
  • Laminated glass: One pane of glass unit can be built with laminated glass for additional security, safety or noise reduction.

Safety & Security Options

  • Aluminium top-hung windows usually come with standard multi-point locking systems.
  • Burglar resistance classes of RC2 or RC3 are also available as security options.
  • PAS24 security options for windows to be installed on ground floors.
  • Restrictor can be used to limit the amount of opening of the top-hung windows for safety.

Thermal Performance

  • Aluminium windows are usually constructed with thermally-broken frames to achieve higher thermal performance.
  • For existing residential buildings, aluminium windows must have either a Uw-value of 1.4 W/m2K or lower, or a WER Band B to comply with Part L of Building Regulations.
  • For new residential buildings, aluminium windows must have a notional Uw-value of 1.2 W/m2K (with limiting value of  1.6 W/m2K for SAP calculation) to comply with Part L of Building Regulations.

Product range

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Building Regulations for Windows

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

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