Help & Advice

Home Security Guides: Patio Doors, Letterboxes & Extra Locks

Simple ways to make uPVC doors and windows harder to break into: patio and French door locks, sash jammers, letterbox security, door chains and key safes. Practical advice from the Home Secure team at our Liverpool trade counter.

Most-read Extra Security guides

All Extra Security guides

Fix a problem

Choose what to buy

Fit it yourself

Parts from these guides

Shop security

Quick answers

How can I secure uPVC French or patio doors?

For hinged French and conservatory doors, the quickest upgrade is a lock that clamps both handles together so they can't be turned from outside. Make sure the door's euro cylinder is anti-snap too. Sliding patio doors need a different lock, so give us a call.

Read the guide: Best Patio Door Security Locks for French Doors & Conservatories (UK Guide)

Will a sash jammer work on my door or window?

Only if it opens inwards. A sash jammer screws to the inside of the frame and its arm swings over the door or window so it can't be pushed open. Use 2 on a door, 2 on the inside letterbox flap to make a letterbox lock, and 1 or 2 on an inward-opening window.

Read the guide: How to Fit a Sash Jammer to uPVC Doors, Windows and Letterboxes

How do I stop letterbox fishing?

Keep keys away from the door and always lock with the key (lift the handle, turn the key). Then block the gap from inside with a steel letterbox cover or a fire-retardant letterbox bag.

Read the guide: How to Prevent Letterbox Burglary: Fishing, Handle Attacks & Fire

More help