Door Locks and Security

Good door locks and security start with the locking system inside the door, then the cylinder, the handle and the glass. Every door we make comes with a multi-point lock: lift the handle and hooks and bolts engage along the edge of the door, not just in the middle.

This guide explains how each part works, what the security ratings mean and the simple habits that keep a door secure.

How a multi-point lock works

A multi-point lock is a long steel strip set into the edge of the door, worked by a gearbox behind the handle, with keeps fixed to the frame. When you lift the handle, hooks and rollers or bolts shoot out at several points and grip the frame.

Locking at three or more points makes the door far harder to force or lever than a single deadlock. It also pulls the door tight against its seals, which helps keep out draughts and rain.

The lock only does its job when it is fully engaged. Lifting the handle throws the hooks, and turning the key locks them in place. If you only pull the door shut, it is held by the latch alone, which is much easier to force.

Cylinders: the key part of door security

The cylinder is the part your key goes into, and it is the most common point of attack. Cheap cylinders can be snapped in seconds, which exposes the cam and lets a burglar open the lock.

Upgrade to an Ultion 3-star cylinder for the highest level of protection, designed to resist snapping, picking and drilling.

What the ratings mean

• TS007 1-star: a basic standard cylinder. It should be paired with a 2-star rated handle to reach a 3-star overall rating.
• TS007 3-star: the cylinder alone meets the top rating, with no need for a security handle.
• Sold Secure Diamond: an independent test that includes attack methods such as snapping. Many insurers and police advice point to Diamond or 3-star cylinders.

Size matters too. A cylinder should sit flush with the handle or stick out no more than 3mm. Our guide on how to measure a euro cylinder shows you how to get the right size.

Building Regulations and door security standards

Approved Document Q of the Building Regulations covers security for new homes in England. Doors that give access to a new dwelling must be shown to resist attack, usually by being tested to PAS 24 or an equivalent standard.

Part Q applies to new dwellings, including conversions that create a new home. It does not normally apply when you replace a door in an existing house, but it is a useful benchmark. If you are building new, ask your building control officer what they need to see.

Door furniture

Choose handles in chrome, satin, gold, black, graphite or white, and add a letterplate, knocker, spyhole, door chain and house numbers to match.

A few points help with security:

• Handles: a lever/pad handle on a front door means it can only be opened from outside with a key. See how to measure a door handle before ordering a replacement.
• Letterplates: fit a letterbox cage or cowl inside so nobody can reach through to the handle or keys.
• Spyholes and chains: let you check who is there before you open the door fully.

Glass and security

Glass near the lock is a weak point if it can be broken to reach the handle. Laminated glass holds together when it cracks, so it is much harder to get through. Our door glass guide explains the options, including obscure glass for privacy.

Composite or uPVC: which is more secure?

Both can be very secure when fitted with a good multi-point lock and a quality cylinder. A composite door has a thicker, solid core, which gives extra strength and a more solid feel. Compare them in our composite vs uPVC doors guide.

Other security tips

• Lift the handle and lock with the key every time you go out.
• Do not leave keys near the door or in the lock.
• Fit a door chain or spyhole so you can check callers.
• Choose laminated glass for panes near the lock.

Common mistakes

• Not locking with the key. Pulling the door shut leaves the multi-point lock unlocked.
• Buying a cylinder that is too long. Extra length outside is easier to grip and snap.
• Forcing a stiff handle. If the handle is hard to lift, the door may need adjusting. Forcing it can damage the gearbox.
• Keeping old cylinders after moving house. You don’t know who has keys, so change them.

Quick answers

Do all your doors come with a multi-point lock?

Yes. Every door we make comes with a multi-point lock that engages along the edge of the door.

What is the most secure cylinder?

Look for a TS007 3-star or Sold Secure Diamond rated cylinder. We offer the Ultion 3-star as an upgrade.

Can I change the cylinder myself?

Yes. It is held by one screw in the edge of the door and takes a few minutes. You can buy cylinders and handles from our hardware and accessories range.

Does my replacement door need to meet Part Q?

Part Q applies to new homes. For a replacement door it is not normally required, but a door built to a similar standard is a sensible choice.

Design a composite door →