uPVC Flush Casement Windows

Flush casement windows are not always better — they are simply a different style choice. The main feature of a flush casement window is that the sash sits level within the frame, creating a flatter, more streamlined appearance than a standard casement window. Many homeowners choose them for their neat, refined look, especially on heritage-style homes and properties where a more traditional or tailored finish is preferred. The best option depends on the appearance you want, as well as your budget and the style of your home.

Flush uPVC windows are often more expensive than standard uPVC casement windows, depending on the design, specification, and glazing options chosen. This is usually because flush windows offer a more detailed and premium appearance. Many homeowners feel the added investment is worthwhile for the cleaner, more elegant finish they provide.

Flush casement windows do not have inherent problems, but there are a few points to consider when choosing the right style for your home. They can be more expensive than standard casement windows, and some homeowners may simply prefer the look of a more conventional projecting sash. As with any window, overall quality depends on the design, manufacturing, and installation. When properly specified and installed, flush casement windows offer excellent performance, security, and visual appeal.

Flush casement windows (also called flush sash windows) feature opening sashes that sit perfectly level with the outer frame when closed, creating a sleek, flat surface with clean lines. This differs from standard casement windows where the sash sits proud of face of the window, creating a stepped appearance.

The short answer is both! Flush casement windows are remarkably versatile. For contemporary homes, their clean lines, minimal frame sight-lines, and sleek flush appearance create a sophisticated, look—especially when finished in modern colours like Anthracite Grey or Slate Grey with contemporary hardware. For traditional properties, the same flush design can be used to authentically replicate historic timber windows, particularly when combined with woodgrain finishes, Georgian bars, and heritage ironmongery.

There’s no difference—these terms are used interchangeably in the window industry to describe the same product! Whether called flush casement or flush sash, both refer to windows where the opening part sits flush with the frame rather than protruding.

We source our uPVC flush casement windows from industry leaders, Kömmerling. These windows deliver exceptional thermal efficiency with U-values as low as 1.2 W/m²K as standard, and an impressive 0.88 W/m²K with triple glazing. The advanced 7-chamber profile design provides superior insulation, helping to reduce energy consumption and heating costs while maintaining comfortable indoor temperatures year-round.

Yes, extremely secure. Our flush windows feature multi-point locking systems incorporating shoot bolts and reinforced glazing designed to resist forced entry for total peace of mind. The inherent strength of the uPVC profile system combined with these security features creates a robust barrier against potential intruders.