Best Security Hardware for Composite Doors
Written by Cornwall Composite DoorsReviewed by Cornwall Composite Doors installersLast updated July 20266 minute read
Short answer
The security hardware that matters most is a TS007 3-star (or Sold Secure Diamond) anti-snap cylinder, a multi-point hook lock case, hinge bolts and a sash jammer to resist levering, plus a TS008 anti-fishing letterplate. Handle style, knocker and finish choice have no bearing on security.
Some hardware is purely decorative and some genuinely determines whether a door resists forced entry. It's worth knowing the difference before you spend money upgrading the wrong thing.
The cylinder is the single biggest factor
Lock snapping — physically breaking the cylinder in seconds with basic tools — is the most common method of forced entry into UK homes. A TS007 3-star (or Sold Secure Diamond, such as Ultion) cylinder is specifically designed to resist this attack and should be treated as non-negotiable, not an optional upgrade, on any composite door.
Multi-point lock cases
A 5, 7 or 9-point hooked lock case engages multiple locking points down the length of the door edge when the handle is lifted or the key turned, rather than relying on a single latch and deadbolt. More points generally mean more resistance to force, though the cylinder quality still matters more than the point count.
Want a quick price?
Free survey, no salesman, no obligation.
Sash jammers and hinge bolts
These stop a door being levered out of its frame at points away from the main lock — a common secondary attack once the main lock has been defeated or bypassed. Hinge bolts (anti-jemmy dog bolts) prevent the door being lifted off even if the hinge pins are drilled out, and are worth confirming as standard rather than assuming they're included.
Letterplates and spyholes
Letterbox fishing — hooking keys through the letterplate — is a real and known attack method, so a TS008-tested anti-fishing letterplate closes that route. A spyhole doesn't stop forced entry but reduces the risk of opportunist distraction burglaries by letting you see who's calling before opening the door.
What doesn't affect security
Handle style, knocker design and hardware finish (chrome, black, brass) have no bearing on a door's resistance to forced entry. It's worth being wary of any sales pitch that implies a particular handle or finish is inherently more secure — the security comes from the lock, hinges and frame fixings, not the cosmetic hardware.
Frequently asked questions
Is a 3-star cylinder really necessary?
Yes. Lock snapping can take under 30 seconds on a 1-star cylinder and is a genuine, common method of entry. A 3-star anti-snap cylinder defeats this attack completely, so it's worth treating as essential rather than optional.
What's the difference between TS007 and Sold Secure Diamond?
TS007 3-star is the British Kitemarked standard for anti-snap cylinders. Sold Secure Diamond (the standard Ultion and Brisant cylinders meet) is a separate, independently tested standard that generally involves more rigorous attack testing. Both are strong choices.
Do smart locks compromise security?
The reputable smart locks fitted on composite doors layer over a standard physical 3-star cylinder, so even if the smart element fails, you still have a fully mechanical, anti-snap lock behind it.
Are hinge bolts fitted as standard?
This varies by installer and lock kit, so it's worth asking directly. They're a relatively low-cost addition that closes a genuine weak point, so we'd recommend confirming they're included rather than assuming.
Explore next
More hardware advice
- Choosing Composite Door HandlesHandles are the most-touched part of your door — here's how to pick one that looks right and lasts in Cornwall's salt air.
- Letterplates Buying GuideA letterplate is the biggest deliberate hole in your front door — here's how to choose one that stays warm, dry and secure.
- Smart Locks for Composite DoorsSmart locks add keyless convenience to a composite door, but only when they're built on top of a proper mechanical lock. Here's what to check.
