What's the difference between flush casement and casement windows?

The main difference between flush casement windows and casement windows is their style – as the name suggests, flush casement windows sit flush within the frame and don’t have the lipped appearance of standard casement windows. Instead, flush windows create a flat, seamless surface with the rest of the property.

Flush casement windows can also come with a mechanical joint to replicate traditional timber. The colours for flush casement windows tend to be more traditional, too, though this is all down to the window supplier.

In terms of energy efficiency and sound-insulation, flush casement windows and casement windows generally operate to the same standard, as those properties are down to the glass used as opposed to the actual window frame.