What is a Cross Window?
A cross window is a window frame divided into four panes by a horizontal and a vertical mullion, creating a cross-shaped pattern. It is a historic window form that is common in traditional Dutch architecture and also in modern restorations and listed buildings.
Parts of a Cross Window
- Stiles — the vertical wooden or steel elements on the outside of the frame
- Rails — the horizontal elements at the top and bottom
- Mullion — the central vertical divider in the middle of the frame
- Transom (transom rail) — the horizontal divider that splits the frame into upper and lower sections
- Casements — the opening parts (window leaves) in the four panes
Variants
| Type | Description |
|---|---|
| Cross window | One mullion + one transom → 4 panes |
| T-frame | Only a horizontal transom → 2 panes top/bottom |
| Double frame | Only a vertical mullion → 2 panes side by side |
| Single frame | No divider → 1 pane |
Historical Context
The cross window is iconic in Dutch architecture from the 15th to the 18th century. Classic canal houses, farmhouses and town houses almost always have cross windows. The material was originally oak; later pine with lead glazing bars.
Restoration and Listed Buildings
When restoring listed buildings it is often compulsory to retain or reconstruct the original cross window. Modern alternatives in aluminium or PVC are in many cases not permitted by the local authority or heritage body.
Making or Replacing a Cross Window Yourself?
| Option | Cost (indicative) | Suitable for |
|---|---|---|
| Ready-made timber cross window | €300 – €800 per window | New build, renovation |
| Custom (joiner) | €600 – €1,500 | Restoration, listed buildings |
| Prefab aluminium | €400 – €900 | Modern interpretation |
Related Terms
- Window frame
- Window reveal
- Reveal depth
- Door sill
- Glazing
- French door
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