Replacement keys vs new locks: Which option is best?

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Published on Thursday, 11 September 2025 13:10

Last Updated on 12 September 2025

Monica Costa

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Security isn’t something most people think about until it’s tested. Losing a key or dealing with a faulty lock can quickly become stressful and leave you unsure of the safest next step. Should you replace the keys or fit brand-new locks? While each option has pros and cons, the best choice depends on your circumstances. Keep reading to see which solution makes the most sense for you.

When Replacement Keys Are the Right Choice

If you’ve simply misplaced a key but still have others, a straightforward replacement is often the easiest route. Ordering a duplicate is quick and cost-effective, especially if the lock is still working smoothly.

For many office settings, facilities managers often rely on professional key services to supply replacements by using key codes stamped on the lock. This avoids the hassle and expense of changing the entire mechanism.

Replacement keys are also a smart choice for storage cupboards, filing cabinets, or lockers in schools and workplaces. As long as there’s no risk of the missing key falling into the wrong hands, getting a new copy maintains convenience and security at a reasonable price.

Situations Where New Locks Are Essential

There are times when a new set of locks is the safer decision. If you’ve moved into a new property, you can’t always be sure who else might have copies of the old keys. Fitting new locks guarantees that only you control access. New locks also make sense if the existing ones are worn, damaged, or outdated.

A stiff lock can trap a key, while older designs may not meet current security standards. Replacing them with a modern alternative not only restores smooth operation but also improves protection against break-ins. Moreover, insurance providers in the UK often recommend or even require locks that meet British Standard BS 3621 for added peace of mind.

Cost And Convenience Compared

Price is a big factor when deciding between the two options. A replacement key is usually cheaper and faster, particularly if it can be cut from a code rather than the original key. In contrast, changing locks requires more time and a higher upfront cost.

However, convenience and safety should also guide your decision. For example, if several employees lose keys to the same office lock over time, it might be more practical to fit a new lock instead of endlessly replacing keys. Similarly, if a tenant moves out of a rented property, new locks ensure the incoming tenant has exclusive access.

Balancing Security And Practical Needs

Choosing between replacement keys and new locks often comes down to balancing risk with practicality. If the lock itself is in good condition and there’s no chance the lost key could be misused, a replacement is the sensible choice. But if you’ve got concerns about who might have access, or if the lock is showing signs of weakness, installing new locks offers stronger reassurance.

Making The Right Decision For You

Both replacement keys and new locks have their place in maintaining security. Keys save time and money in low-risk scenarios, while new locks provide certainty when safety is at stake. Think about your situation carefully, weigh up the risks, and decide which option protects your property best.