Are uPVC Windows Really Secure? What to Check

If you are weighing up new windows and wondering, are uPVC windows secure, the short answer is that modern ones are very secure indeed. The security comes from the locks, hinges and glass working together rather than the frame material alone. Here is what actually keeps a window safe, and what to look for when you buy.

It is the locking system that counts

The biggest jump in window security over the last couple of decades has been in the locks. A modern uPVC window uses a multipoint locking system, which drives several bolts or mushroom cams into the frame when you turn the handle. Because the window is held shut in several places at once, it cannot be levered open at a single weak point.

A few things to check on the locking:

• Shootbolt or cam locks that engage more than one point around the sash
• Key-locking handles, so the window cannot be opened even if someone reaches the handle through a small gap
• A handle that locks firmly rather than feeling loose or sloppy

If your existing handles are stiff, wobbly or no longer lock properly, that is worth putting right. We handle window and door repairs across York, including replacement handles and worn locking gear.

Hinges matter more than people think

Hinges are the quiet heroes of window security. Good windows use restrictor hinges and, importantly, hinges designed to resist the sash being lifted or forced out of the frame. Some are fitted with anti-lift features so the opening part cannot simply be jemmied off its pivots. On older windows, tired hinges are a common weak point, and swapping them is usually a small job.

The glass and the beading

Two glazing details make a real difference:

• Laminated or toughened glass is far harder to break through than ordinary glass. Laminated glass in particular holds together when cracked, so it cannot be pushed out quietly.
• Internal beading means the strip holding the glass in place sits on the inside. That stops anyone prising the beading off from outside to remove the pane. Almost all modern uPVC windows are made this way, but it is worth confirming on anything older.

Together, these mean the glass is rarely the easy route in that people assume.

Accreditations worth looking for

You do not have to take a maker's word for it. Independent schemes test and rate window security, and seeing one of these is a good sign:

• Secured by Design, the police-backed scheme, is a strong marker that a window has been tested to a recognised security standard.
• PAS 24 is the standard for enhanced security performance that many well made windows are tested against.

Treat these as helpful guidance rather than a cast-iron guarantee, and remember that standards get updated over time. If security is a priority, ask specifically whether a window meets a current recognised standard. You can see the specifications across our uPVC windows in York range, and our casement windows are a popular secure choice for local homes.

Quick checklist when buying

When comparing quotes, run through this:

• Multipoint locking with key-locking handles
• Anti-lift or restrictor hinges
• Laminated or toughened glass, especially on ground floor and accessible windows
• Internal beading
• A recognised accreditation such as Secured by Design or a PAS 24 test

Get most of those and you have a genuinely secure window rather than one that only looks the part.

York homes and older windows

Around York we see plenty of windows from the 1990s and early 2000s that were fine in their day but now have basic locks and worn hinges. If yours are of that vintage, either a security upgrade or replacement is worth considering, especially on ground floor and rear windows that are easier to reach. Newer builds around the ring road usually already have modern multipoint locking, but it is still worth checking the handles lock properly.

Rough 2026 costs

Prices vary with size, glazing and style, so treat these as broad 2026 guides. A supplied and fitted uPVC casement window often lands somewhere around 400 to 900 pounds each, with larger or specially glazed units costing more. Upgrading handles or hinges on an existing window is usually a modest job. For numbers based on your home, ask us for a quote.

FAQs

Are modern uPVC windows secure?

Yes. Modern uPVC windows use multipoint locking, anti-lift hinges and tough glazing, which together make them very secure. The frame material matters less than the locks, hinges and glass fitted to it.

What is the most secure lock for uPVC windows?

A multipoint locking system with a key-locking handle is the standard to aim for. It bolts the sash to the frame in several places, so the window cannot be forced open at one point.

Should I choose laminated glass for security?

Laminated glass is a strong choice, especially on ground floor windows, because it holds together when cracked and cannot be pushed out quietly. Toughened glass is also much stronger than ordinary glass.

What does Secured by Design mean?

It is a police-backed scheme that recognises products tested to a set security standard. Seeing it on a window is a good sign, though it is best treated as helpful guidance rather than an absolute guarantee.

Are old uPVC windows a security risk?

They can be, if the locks are basic and the hinges are worn. Windows from the 1990s or early 2000s often benefit from upgraded locking, new hinges or replacement, particularly on accessible windows.

Want to compare secure styles side by side? Download our latest brochure, or request a free quote and we will pop out for a look.