Choosing the Right Lock: A Buyer's Guide from Expert Locksmiths

The right lock is the one that matches the door, the level of risk, the way the property is used and any relevant insurance or building requirements. A premium lock fitted to the wrong door can perform worse than a correctly specified mid-range product, so we always start with the complete doorset rather than choosing from a product label alone.

At Swift Locksmiths, we look at the door material, frame, existing lock case or multipoint mechanism, cylinder exposure, hinges, handles, glazing and escape requirements before recommending a replacement. That approach is especially important because timber doors, uPVC doors, composite doors and aluminium commercial entrances can use very different locking systems.

This updated buyer's guide explains the main lock types UK customers encounter, the security standards that matter, current police advice on euro cylinders, how to think about smart locks, what insurers may ask for and why professional fitting can be as important as the product itself.

Originally published: 22nd January 2024  |  Last updated: 1st September 2026

Start With the Door, Not the Lock Catalogue

The biggest buying mistake is choosing a lock before understanding what it has to fit. A traditional timber front door may use a mortice deadlock, mortice sashlock and night latch. A modern uPVC or composite door normally uses a multipoint mechanism with a euro cylinder. Aluminium shopfront doors can use narrow-stile locks or specialist commercial hardware. These systems are not interchangeable.

We also check the thickness of the door, the condition of the frame, the position of the keeps and whether the door already rubs or needs lifting. If the door is out of alignment, replacing the cylinder alone may not resolve a stiff key or handle. In some cases the apparent lock fault is actually a hinge or frame problem.

Euro Cylinders: What Current Police Advice Says

Euro cylinders are widely used in uPVC and composite doors. Current Metropolitan Police guidance says that when changing a suitable euro-cylinder lock, homeowners should choose a three-star cylinder meeting TS007. Those products are designed to provide improved resistance to common attacks including snapping, drilling and bumping.

The star rating is not the whole installation. Cylinder length matters because excessive projection can expose the component unnecessarily. Handles or escutcheons around the cylinder also contribute to protection, and the multipoint strip must still lock smoothly. A door that needs force can wear a new cylinder quickly.

Timber Doors and British Standards

For robust timber doors, police and Secured by Design guidance commonly points homeowners towards British Standard-approved mortice hardware and sound frame reinforcement. The exact product should suit the door thickness, existing preparation and how the entrance is used. A poorly installed lock case can weaken the timber around it rather than strengthen the door.

Insurance policies sometimes specify standards or minimum security arrangements, but the wording varies. We do not tell customers that one standard is automatically an insurance requirement for every home. Check the actual policy schedule and endorsements, especially after changing the door or lock type.

Deadlocks, Night Latches and Combined Security

A night latch is convenient because the door can latch automatically when it closes, but not every night latch provides the same security. On suitable timber doors, a deadlock can add a separate locking point. The best arrangement depends on door construction, occupancy and how quickly occupants may need to exit.

Where two locks are fitted, people need to use them consistently. A high-quality mortice lock offers little benefit if it is routinely left disengaged. Police advice repeatedly emphasises the value of actually double-locking appropriate doors when leaving the property.

Multipoint Locks: More Than the Cylinder

Multipoint doors use hooks, rollers or bolts along the door edge. The cylinder authorises the movement, but the central gearbox and the alignment of every locking point determine whether the system completes its travel. If the handle becomes heavy, the key only turns while you pull the door, or the mechanism works with the door open but not closed, diagnosis should come before buying parts.

Our lock repair and replacement services include uPVC and multipoint faults, so we regularly see new cylinders fitted to doors where the real issue is hinge movement or gearbox wear. Correcting the cause can be cheaper and more reliable than replacing unrelated components.

What About Smart Locks?

Smart locks can be useful when remote access, temporary codes or user management solves a genuine problem. They can suit households with carers, cleaners or frequent visitors and businesses that need controlled credentials. However, they introduce batteries, accounts, software updates and sometimes cloud services into a security decision.

Choose a supported product with a clear backup method. Keep app accounts protected with strong unique passwords and two-step verification where available. A smart lock should also be physically compatible with the door rather than forcing a mechanical system to operate in a way the manufacturer did not intend.

Padlocks and Outbuilding Locks

For sheds, gates and outbuildings, consider the chain, staple, hinge screws and door fabric as well as the padlock. Police advice warns that outbuildings can contain tools useful to an intruder, so a strong padlock attached to weak timber or exposed fixings is a poor use of budget.

If valuable cycles, machinery or tools are stored inside, check the insurance requirements and consider layered security such as a robust door, protected hinge fixings, ground anchor and alarm rather than relying on one portable lock.

Key Control Matters as Much as Lock Strength

If you have recently moved house, lost a key or cannot account for copies issued to previous occupants, the decision may be about regaining control rather than upgrading attack resistance. Replacing the relevant cylinder or lock makes historical keys invalid. Businesses may go further with restricted-key or master-key systems when duplication control matters.

We recommend keeping spare keys with trusted people or in a properly selected access arrangement, not under obvious outdoor hiding places. Never label a spare with the full property address.

When Professional Installation Is Worth It

Professional fitting is especially valuable where the door is already stiff, the lock has failed, the cylinder size is uncertain, the property has unusual hardware or the door forms part of a fire or communal escape route. The installer should test operation from both sides, confirm the door closes without force and explain how the lock should be used.

If you are comparing options, read about our independent local approach and ask for a recommendation based on the existing door rather than a generic package.

A Practical Lock-Buying Checklist

What We Recommend

There is no single “best lock” for every property. We would rather fit the correct lock to a sound door than sell a premium product that does not address the real weakness. Start with the door, identify the security and access problem, then choose the simplest tested solution that solves it well.

Sources and References

Source: Metropolitan Police, Door and window lock advice, current guidance accessed September 2026.

Source: Metropolitan Police, Door security guidance, current page accessed September 2026.

Source: Secured by Design, current guidance for front and back doors and Police Preferred Specification products, accessed September 2026.