This sliding sash design is ideal for wider window openings where structure and symmetry play an important role in the overall look of the room. Manufactured as a single unit with one continuous outer frame, the window features two internal vertical mullions that divide the glazing into three balanced sections without turning it into multiple windows.

This uPVC sliding sash window follows a top-operated layout, where the top sash sits on the inner track and appears visually in front of the lower sash. This configuration allows the operating hardware to sit neatly on the upper section, keeping the design tidy while remaining easy to use. Many homeowners choosing a uPVC window with a more traditional feel prefer this setup for its familiar appearance and controlled operation.

Vertical sliding makes this window practical in rooms where outward-opening windows are not ideal. Ventilation can be adjusted smoothly by moving the sashes up or down, helping regulate airflow without affecting curtains or nearby furniture. The added mullions bring extra definition to the glazing while still allowing plenty of natural light into the space.

uPVC Sliding Sash Window with Double Mullions for Balanced Proportions

Two handles mounted on the top sash provide even operation across the width of the window, while the bottom sash remains uncluttered and visually calm. The result is a refined, well-proportioned design that feels both traditional and practical.

As part of a wider range of uPVC sliding sash windows, this model works comfortably alongside other uPVC windows throughout the home, helping create a consistent style while delivering reliable everyday performance with low maintenance.