What are the parts of a uPVC window?
A uPVC window isn't one solid piece. It's built from several uPVC window parts: profiles, glass, hinges and locks, gaskets, handles and the fixings that hold it in the wall. Knowing what each part does helps you compare quotes, spot problems early and decide whether a fault is a quick fix or a job for an installer.
Measuring up, removing the old frame and fitting the new one are normally done by the installer, so you don't need to do it yourself. Below we go through the most common parts.
Which uPVC window parts are there?
Profiles
Every uPVC window frame is made from profiles: the outer frame and the sash that opens. The profile is the main part, and it comes in many colours and finishes, including convincing wood-effect foils. Trims such as corner profiles, cover strips and a window sill finish it off. When comparing quotes, ask about the profile's thickness and number of chambers, as these affect insulation and stiffness.
Glass
The glazing is a window part too. Most new frames come with high-efficiency double glazing as standard. Ask about triple glazing, acoustic glass or safety glass if you need it, for example in doors or low windows.
Hinges and locks
Which hinges and locks you need depends on the type of window. A tilt and turn window has a handle you turn up to tilt the window and sideways to open it fully. For better security, choose a lockable handle and multi-point locking. A turn window can also have a restrictor, so it stays open in the position you choose.
Installation materials
Frame screws, fixing anchors and packers hold the frame in the wall. They're hidden once the window is in, but correct fixing and sealing around the frame matter as much as the frame itself for keeping out draughts and damp.
uPVC window gaskets against draughts
Gaskets (also called glazing seals) keep out draughts and water. Over time they lose their elasticity, go brittle and can crack. If you feel a draught around a closed window, worn gaskets are a likely cause. Before assuming the whole frame needs replacing, ask an installer whether new gaskets will do: it's a much cheaper and quicker fix.
My uPVC window doesn't close properly
A window that won't close doesn't always mean broken parts. A common problem with tilt and turn windows is that the sash ends up in the tilt and turn position at the same time, so it hangs from one corner. You can usually fix this yourself:
1. Find the small button or catch on the locking mechanism, level with the handle.
2. Hold it in while turning the handle to the tilt position (usually upwards).
3. With your other hand, push the window back into the frame on the hinge side.
4. Turn the handle back to horizontal and release the button.
5. Close the window.
If the mechanism is just stiff, a little lock oil or silicone spray on the moving parts often helps. If that doesn't work, contact the supplier: check what the warranty covers before paying for a repair.
uPVC window repair kit
If you're reasonably handy, you can handle small jobs yourself: a small crack, dent or scratch, a bit of loose foil, a single blister or a stiff mechanism. These spot repairs can be done with a uPVC repair kit from most DIY stores. Work in dry weather and clean the area well first.
Restoring a uPVC window frame
If several parts are damaged, or the damage is extensive, a repair kit won't be enough. Foil coming loose or blistering in several places usually means the foil needs replacing, which is a job for a specialist. Your supplier or a frame restorer can advise whether restoring or replacing makes more sense.
Want to know what new uPVC window parts or a new frame will cost? Prices vary by size, glazing and finish, so request free, no-obligation quotes from several installers and compare what's included.
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