How does multi-point locking work, and why does it matter so much? Here's a plain explanation.
Turning the handle drives a gear inside the sash that pushes locking points out along its length — typically at several places around the frame — engaging them all at once. That pulls the sash evenly against the gaskets all the way round.
Multi-point locking is why modern uPVC windows seal the way they do. A single central catch pulls only at one point, so the sash edges can lift away and let air through — multi-point closes the whole perimeter at once.
Turning the handle drives a gear that pushes locking points out along the sash's length, engaging several points at once and pulling the sash evenly against the gaskets all round.
For both security and sealing — a single catch pulls at one point only, letting the sash edges lift and drift. Multi-point closes the whole perimeter evenly.
We fit it as standard where the style suits — it's a big part of why a modern uPVC window seals well.
Related guides covering this topic from other angles — different products, applications, or contexts.
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