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uPVC Window Anatomy: The Parts Explained

uPVC Window Anatomy — here's a clear, practical explanation.

The parts of a uPVC window

A uPVC window is made of the outer frame, the sash (moving part), glazing (glass), gaskets (seals), hardware (locks, hinges, rollers), and any mullions or transoms dividing it.

What to know

Look for this

  • Frame — the fixed outer part
  • Sash — the moving, glass-holding part
  • Glazing — the glass
  • Gaskets — the seals
  • Hardware — locks, hinges, rollers
  • Mullions/transoms — dividers

Why it matters for your windows

Knowing the parts helps you discuss and compare windows sensibly — each part has a quality dimension, and together they make the finished window.

Questions

Frequently asked

uPVC Window Anatomy?

A uPVC window is made of the outer frame, the sash (moving part), glazing (glass), gaskets (seals), hardware (locks, hinges, rollers), and any mullions or transoms dividing it.

Does this affect window quality?

Knowing the parts helps you discuss and compare windows sensibly — each part has a quality dimension, and together they make the finished window.

Does Glassterr handle this?

Yes — we build and fit windows in-house at our Pannimadai factory, controlling these details.

From our range

What we make

uPVC Sliding Windows

Multi-track windows that need no swing space.

uPVC Casement Windows

Side-hung sashes for full airflow and the tightest seal.

uPVC Performance Systems

Double-glazed acoustic and thermal windows.

Related Guides

You might also need

Related guides covering this topic from other angles — different products, applications, or contexts.

Talk to the maker, not a middleman

Tell us your openings and we'll measure on site, advise, and give you a real quote — factory-direct from our Pannimadai works in Coimbatore.