Here's a plain-language tour of the main uPVC window types and what each is good for, so the names mean something when you're choosing.
Sliding windows glide on tracks and need no swing space. Casement windows hinge at the side, open fully for airflow, and seal tightest when shut.
Tilt & turn windows do two things: tilt inward at the top for secure trickle ventilation, or swing fully open for cleaning and airflow. Fixed windows don't open at all — they're for light and view where ventilation isn't needed.
Bay and specialty windows create projecting or shaped openings for character and extra light. Ventilators and louvres handle small-format airflow for bathrooms, kitchens, and stairwells.
A dual-action window: it tilts inward at the top for secure ventilation, or swings fully open like a casement for full airflow and easy cleaning.
Fixed windows don't open — they're purely for light and view. Openable types (sliding, casement, tilt & turn) provide ventilation.
Sliding windows are the most-fitted in this region because they need no swing space, with casements close behind for airflow and sealing.
Related guides covering this topic from other angles — different products, applications, or contexts.
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