Window Security: PAS 24, Locks and What to Look For

Modern windows are a serious security upgrade over old ones — if you specify them right. Here’s what actually keeps a home safe.

PAS 24 and Secured by Design

PAS 24 is the UK test standard for resistance to forced entry; it’s required on accessible windows and doors in new builds under Part Q and is a smart choice for replacements too. The police-backed Secured by Design scheme certifies products that exceed the baseline.

Locking and glass

• Multi-point locking that engages the sash at several points around the frame.
• Internally glazed units so the glass can’t be removed from outside.
• Laminated glass in vulnerable locations — it holds together when struck.
• Key-lockable handles and robust hinges with anti-lift features.

Don’t forget doors

Pair secure windows with a quality door and cylinder — a 3-star anti-snap cylinder on a composite or solid door is a strong deterrent.

Get quotes and ask each installer about PAS 24 and locking as standard.

Frequently asked questions

Is PAS 24 required for replacement windows?

Not legally for like-for-like replacements in existing homes, but it’s a worthwhile upgrade and often included.

Does laminated glass stop break-ins?

It won’t make a window impregnable, but it dramatically slows forced entry and is a strong deterrent.