Alitherm Heritage

Windows, Doors, Screens & Bifolds

Heritage Double Doors


We manufacture Alitherm Heritage Doors, Windows and Bifolds which are an ideal solution for heritage applications such as listed building renovations and large scale replica-refurbishment projects where planning constraints are to be considered.

This window and door system features a Steel look inspired design.

Frames can be built as a series of horizontal or vertical modules which are joined using bespoke couplers to form a multi-part frame that can incorporate doors and opening window casements.

The latest addition to the system is the slimline Heritage Bifold which compliments the original Steel-look windows and doors perfectly.

Heritage Corner Section

Product Details

  • Material
    Aluminium Polyamide
  • Dual Colour
  • Thermally Broken
  • NBS Available
  • WER rating
  • U Value
    1.5W/m²K using 1.0 W/m²K centre pane
  • Doc L Compliant
  • BS6375-1:2009
  • BS4873


Alitherm Heritage profiles utilise Smart’s innovative polyamide thermal break technology which creates a barrier between the cold air outside and the warm air inside. This technology significantly reduces thermal transmittance and enhances the overall U Value of a product and is designed to meet the exacting requirements of Document L 2010.

They are available in a choice of standard or non-standard colours, including metallic, dual colour, Smart’s Sensations textured, and Alchemy anodised effect finishes.

Heritage windows and doors are now available as PAS24:2016 compliant.

Alitherm Heritage Window: Design Limitation and Performance

  • Security tested to PAS 24:2016
  • Weather tested to BS 6375 Part 1:2009
  • British Standard Kitemark KM 81543
  • British Standard Kitemark KM 81580
  • Fixed windows, tilt turn, side hung or top hung open out casements
  • Polyamide thermal break provides enhanced thermal performance
  • Designed as a direct replacement for steel windows
  • Single or dual colour, marine quality polyester powder coat as standard
  • Heritage and Art Deco hardware options

Hardware Options

A selection of bespoke hardware is available.

Brass Art Deco Door Handle

also available in Satin Nickel

Brass Art Deco Window Handle

also available in Satin Nickel

Pewter Bulb End Window Handle

also available in Black

Pewter Monkey Tail Window Handle

also available in Black


  • Side Hung Max Width


  • Side Hung Max Height


  • Top Hung Max Width


  • Top Hung Max Height


  • Fixed Max Width


  • Fixed Max Height


  • Single Door Max Width


  • Single Door Max Height


  • Glazing

    24, 28, 32 & 36 double or triple glazed units

  • Frame Depth


  • Typical Sightlines


  • Black Aluminium Heritage Internal Double Doors

    Internal Double Doors

  • Heritage Curved Head Windows with Astragal Bars

    Curved Head Windows

  • Black Heritage Double Doors and Sidelight

    External Double Doors and Sidelight

  • Alitherm Heritage Doors on rear extension

    Black Alitherm Heritage Doors

  • Internal View of Heriage Double Doors

    Heritage Double Doors

  • Interior Door

    Interior Door

  • Interior View of Small Pane Heritage Door Gable end

    Heritage Double Doors

    Would you like to know more about this product?

    Swan Doors & Windows Ltd
    Unit 3 & 4 Galley Hill Trading Estate
    London Road
    DA10 0AA

    Telephone: 01634 723864

    Swan Doors & Windows Ltd - Company Registration No. 4129958