At we offer you several combinations of window design and glazing bar options.

Single Sash Windows Double sash windows Triple sash windows design
Single sash window
Double sash window
Triple Sash window

Glazing bar design – changes through time

Georgian (18th Century)

Georgian windows were designed with a special Classical relationship between their widths and heights, known as the Golden Mean (approx 1:1.6). The glass panes were designed to conform to these same proportions. The overall effect was a carefully contrived harmony between glass and window frame proportions. Even where opes had to depart from that proportion, the glass proportions were maintained in that ratio, by having a different number of panes in the top and bottom sash, as illustrated below.


Six over Six design of Sash Windows Three over Siz Sash Windows design Three over Three Sash Windows Design
6 over 6
3 over 6
3 over 3

Regency (early 19th century)

Later, Regency windows used the ability (then new) to make larger glass panes, as seen here:

Sash Windows Design from Regency period



Victorian (mid-to late 19th century)

By Victorian times, even larger glass panes allowed 2 panes over 2

Victorian Sash Windows Design



Edwardian (early 20th century)

The final sash window development, at the turn of the twentieth century, was the elimination of that last vertical glazing bar, in the Edwardian window.

Sash windows edwardian design