Understanding multipoint locks
A multipoint lock is fitted with several bolts that lock the door simultaneously at several points along the frame. The more locking points, the better the resistance to forced entry by levering the door leaf.
| Type | Locking points | Resistance | Typical use |
|---|---|---|---|
| Single-point (1 pt) | 1 | Low | Interior door, outbuilding |
| 3-point | 3 (top, bottom, middle) | Good | Standard front door, residential building |
| 5-point | 5 | Very good | Reinforced front door, A2P |
| 7-point | 7 | Maximum | High-security armoured door, commercial use |
Mortice, rim or cover-plate: what is the difference?
Mortice lock
The lock case is recessed into the thickness of the door leaf. It is the most discreet and attractive solution, but fitting requires cutting a mortice in the door (joinery work). Recommended when a new door is first installed.
Rim lock
The case is surface-mounted on the inside face of the door. Easier to fit in a renovation (no alteration to the door leaf), and the case reinforces the door. Visible from the inside only.
Cover-plate lock
A variant of the rim lock with a vertical decorative cover concealing all the locking points. Very discreet once fitted, with a strong visual deterrent, and common on house doors in renovation projects.
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Installation and key points
Fitting a multipoint lock as a direct replacement (same dimensions, same backset) takes 30 to 60 minutes. It involves:
- Removing the inside and outside handles
- Removing the existing lock (4 to 6 screws depending on the model)
- Fitting the new lock case into the existing recess
- Adjusting the forends and checking the clearance against the frame
- Testing operation with the key and the latch
If the new lock has different dimensions (backset, forend), the frame will need adapting: in that case, call in a qualified locksmith.
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