The 5 Best Security Features for Your New Front Door

A homeowner’s guide to lock snapping, solid cores, and the exact hardware required to keep your home impenetrable.

When choosing a new front door, beautiful aesthetics and energy efficiency are obviously important. But the absolute, non-negotiable priority must always be security. As the old industry saying goes, a thermally efficient but poorly secured door is just a “polite suggestion” to a determined intruder.

At KJM Group, we partner specifically with Comp Door because their engineering doesn’t just meet minimum UK security standards—they deliberately exceed them. Here are the 5 critical features that make our doors the fortress your property deserves.

1. The ABS 3-Star “Diamond Grade” Cylinder

The euro lock cylinder (the part you put the key into) is the most common point of attack for UK burglars. Intruders use a frighteningly quick method called “Lock Snapping”, where they use grips or mole grips on the protruding cylinder and physically snap it in half, exposing the internal firing mechanism and opening the door in under 9 seconds.

The Comp Door Solution: Every single composite door we install at KJM comes with an ABS Anti-Snap Diamond Grade Cylinder as standard. This is widely considered the highest-rated lock on the residential market.

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Inside the ABS Cylinder: The ‘Active Snap Protection’ firing pin blocks access if the front section is attacked.

It features a highly engineered, hidden firing pin. If an intruder attempts to snap the lock, the front section deliberately breaks away (a sacrificial cut), and the internal pin fires into the cam, completely locking the central mechanism. The intruder is left outside holding a broken piece of metal, while your door remains firmly and permanently locked.

2. The 48mm Solid Core Advantage

Many cheaper “composite” or standard uPVC doors on the market are actually filled with lightweight styrofoam. While these foam cores are thermally efficient, they completely lack the brute physical strength of timber and can be kicked through by a determined intruder.

KJM’s Comp Doors feature a premium 48mm thick cross-laminated Albasia Falcata timber core. This exceptionally dense solid wood core makes the door feel incredibly substantial and provides immense, unyielding resistance to being kicked, barged, or physically breached.

3. Multi-Point Hook Locking Mechanism

A single deadbolt in the centre of the door is simply not enough to stop leverage attacks. Our doors utilise a high-security multi-point locking system that engages simultaneously along the full height of the frame.

Crucially, we use Hook Bolts. Unlike standard sliding straight bolts, hooks curve upward into the hardened steel keeps on the frame. This mechanism essentially “claws” the door and frame tightly together, making it nearly impossible for an intruder to lever the door away from the frame using a crowbar or spade.

Note: Comp Door also offers an optional “Auto Slam Shut” lock upgrade, which engages the heavy-duty hooks automatically the moment the door is pulled closed—perfect for absolute peace of mind when rushing out.

4. TriSeal Frames & Hinge Dog Bolts

Even the strongest door slab in the world is useless if the outer frame gives way. Comp Door uses an industry-leading TriSeal Frame system. This triple-seal design offers incredible weatherproofing against driving rain, but also creates much tighter physical tolerances that make prying tools totally ineffective.

Furthermore, the vulnerable hinge side of the door is protected by heavy-duty Dog Bolts. These are solid steel pins that automatically slot deeply into the frame when the door closes. Even in the highly unlikely event that a burglar ground the exterior hinges off using power tools, the door would still remain locked solid into the frame via these pins.

5. Laminated Glass (The Invisible Shield)

If you have decorative glass panels in your front door, they represent a potential entry point. Standard toughened glass is designed for safety, but it shatters entirely into granules when hit hard with a brick.

For the ultimate security upgrade (which is standard on many Secured by Design specifications), you must specify Laminated Glass. As detailed in our Complete Laminated Glass Guide, this glass physically holds together even when heavily shattered, thanks to a highly durable PVB plastic interlayer. It acts exactly like a car windscreen—an intruder might crack it, but they cannot push their arm through it to reach the internal handle.

6. Securing Hampshire & Berkshire Homes

7. Frequently Asked Questions (FAQs)