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Up until the early 20th century it was more economical to use smaller panes of glass, the smaller panes were cheaper to make. Now we can manufacture much larger panes of glass (5m or more!)  but if you want that smaller paned look to blend with your design then we can make windows to suit.


Colonial bars look good in historic homes and Victorian or Edwardian conservatories, sunrooms and orangeries. We make two different kinds of colonial bars:


A “Vienna” colonial bar uses a larger pane which is not acutally divided. We fit little spacer between the doubles panes and then timber colonial bars are glued onto the glass.

“Structural” colonial bars are more traditional with many smaller panes of glass being joined to give the lattice or diagonal effect.


Please contact to find the right solution for your project.


Edwardian and Victorian style timber conservatory with French doors


Many New Zealanders dream of having a Victorian style timber conservatory. At ThermaDura we offer many different options to achieve the desired look for your project.

Historic conservatories

The timber construction makes your historical conservatory or orangery a timeless original.

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