Side-hung windows, also known as casement windows are outward opening windows that are hinged at the side. This style of window actually preceded sash windows in Ireland and since have returned to fashion with their elegance and natural thermal efficiency.
These windows can also be called French windows if there is no central mullion. That is to say, a French window, when opened has nothing to impede the view. However, as there is more workmanship involved, they will be more expensive than a traditional casement window.
These windows create a good seal by the nature of the window construction. The windows themselves, by design, have reduced air leakage. This is due to the fact that the windows seal against each other. As a guide, the average U-value for our windows is 1.3.
Published on 22nd January 2020
Jennie Ritchie, Timeless Sash Windows