Can I change a door lock myself?

Yes, especially if you’re replacing like-for-like locks. Simple cylinder locks are often straightforward to swap with just a screwdriver. However, mortise locks (particularly those meeting BS3621 standards) can be more complex and may require specialised tools and knowledge.

In this article we’ll look at when to change door locks, how to give it a go, when to call in a qualified expert and how much it will cost you.

How to change locks on front door UK

Changing locks on a UK front door depends on the type of lock.

For euro cylinder locks (common in uPVC and composite doors) start by removing the retaining screw on the door’s edge, aligning with the cylinder’s centre. Gently wiggle and extract the cylinder, possibly needing to turn the key slightly.

Measure the old cylinder to purchase a matching replacement. Insert the new cylinder, aligning it correctly, and replace the retaining screw. Test the lock with the key.

For mortise locks, a more complex process, you’ll need to remove the faceplate screws, then the lock body screws, and carefully extract the lock. Reversing the process installs the new lock.

Always ensure the new lock meets British Standards (BS3621 is recommended) for security. If unsure, consulting a qualified locksmith is highly advisable.

Can you change a lock cylinder yourself?

Yes! Changing a door cylinder lock is a relatively simple DIY task as this is a common type of lock.

First, locate the retaining screw on the edge of the door, directly below the cylinder. Unscrew it, and then gently wiggle and pull the cylinder out. You might need to turn the key slightly to align the cam for removal.

Next, measure the length of the old cylinder to ensure you purchase a replacement of the same size. Insert the new cylinder into the hole, again possibly needing to turn the key slightly for proper alignment.

Replace the retaining screw and tighten it securely. Test the lock with the key to ensure it functions smoothly. If you encounter any resistance, double-check the alignment of the cylinder and the retaining screw.

Why do you need a locksmith?

If you’re unsure or dealing with a high-security lock, it’s best to consult a qualified locksmith. Incorrect installation can compromise the lock’s effectiveness and potentially invalidate your home insurance. Additionally, if you’re changing the type of lock, rather than just replacing an existing one, you’ll likely need to modify the door, which can be challenging without experience. Refer to the Master Locksmiths Association for advice.

How much do locksmiths charge UK?

Locksmith charges in the UK can vary significantly depending on the time of day, location, and the complexity of the job. Emergency call-outs, especially during evenings, weekends, or bank holidays, will naturally incur higher fees.

Generally, you can expect to pay anywhere from £60 to £150 for a standard call-out, with hourly rates ranging from £50 to £100. More complex jobs, such as installing high-security locks or repairing damaged mechanisms, will increase the overall cost.

It’s always advisable to obtain quotes from multiple locksmiths before proceeding, and to clarify any potential additional charges, such as parts or labour, to avoid unexpected expenses. There are also extra costs to think about, here are a few examples where locksmiths may reasonably charge extra:

Lockout charge	If you’re locked out and need emergency access, expect an additional call-out charge from a locksmith. In certain circumstances, it may be possible to replace lost keys without changing your locks. In this case, you’ll be charged for the new door keys and any call-out fees.
Broken or snapped keys	If there’s something stuck in your lock, this will need to be removed and will probably incur extra costs.
Multiple locks required	Replacing locks on multiple doors will obviously increase the total cost. For example, if you’ve been burgled, you may choose to replace all the uPVC locks at a property. This could cost around £400 – £600 depending on the locks used and amount of locks.

Remember, these are generic estimates. The actual cost can vary based on your location, the specific lock you choose, and the locksmith’s rates. It’s always wise to get quotes from a few locksmiths before making a decision.

Why are locksmiths so expensive?

Qualified and accredited locksmiths are experienced experts. They’re prepared for any scenario and are able to deal with a wide variety of locks, fast. When you call in a locksmith, you can expect quicker access to your property, a clear explanation and a problem solved. As well as peace of mind.

However it’s important to note that hiring a professional does add labour costs. Expect to pay £85 and upwards, depending on the complexity and urgency. With this in mind, here’s a cost estimate considering both lock costs and locksmith charges:

DIY with Standard Cylinder
£25 (lock) + £0 (labour costs) = £25

uPVC Patio Door Lock
Replacement £90 to £120 per lock + £100 minimum in locksmith charges = £220 (average)

Locksmith with Anti-Snap Cylinder
£60 (lock) + £100 minimum in locksmith charges = £160 (average)

When is it time to change door locks?

You don’t necessarily need to change door locks on a strict schedule, but there are several situations that signal it’s a good time to consider a replacement:

Lost or Stolen Keys
A missing key is a potential security breach. Replace locks to prevent unauthorised entry.

Following an incident
After a break-in, replacing the locks not only deters future attempts but also provides a sense of security.

Roommate Moving Out/Change in Occupancy
Especially if the departing person had a key, replacing the lock ensures only current residents have access.

Moving House
You never know how many keys are floating around for your new place. Changing the locks ensures only authorised people have access.

Sticking or Stiff Operation
If your key struggles to turn smoothly, it indicates internal wear and tear. A new lock ensures smooth operation and better security. In more serious cases, keys can get snapped inside the lock.

Visible Damage
Cracks, breaks, or corrosion on the lock itself weakens its security. Replace a damaged lock to maintain optimal protection.

Loose Feel
A door that feels flimsy when locked might have a compromised lock. Replacing it reinforces security.

Age and Wear
While not a strict rule, some recommend changing uPVC door locks every 7 years or so to address wear and tear and potentially upgrade to a more secure model.

In summary, prioritise changing door locks when security is compromised or the lock itself malfunctions. Regular maintenance checks and considering a refresh every few years can also be worthwhile for peace of mind.

Are smart locks worth it?

In 2025, smart locks offer significant benefits beyond simple keyless entry.

Enhanced security features, such as biometric authentication and encrypted communication, minimise the risk of unauthorised access. Remote locking and unlocking capabilities provide convenience and peace of mind, allowing you to grant access to visitors or family members even when you’re away.

Activity logs offer a detailed record of who entered and exited, increasing transparency and accountability. Integration with smart home ecosystems enables seamless automation, like triggering lights or alarms upon entry.

The ability to generate temporary or scheduled access codes eliminates the need for physical key exchanges, reducing the risk of lost or stolen keys and improving overall home security management.

Change door locks yourself or use a locksmith?

Changing door locks yourself can save money and offers the satisfaction of a DIY project, especially for simple cylinder lock replacements.

However, it carries the risk of incorrect installation, potentially compromising security and invalidating insurance. Complex locks (such as mortise locks) require specialised knowledge and tools, making professional locksmiths a safer option.

Locksmiths provide expert installation, ensuring optimal security and often offering warranties. They can also handle emergency call-outs and give advice on security upgrades. While more expensive, a locksmith’s expertise minimises the risk of errors and provides peace of mind, particularly for high-security locks or complex installations.

Learn more about different types of door locks and find out how to improve front door security with our essential guide. If you need to change uPVC door locks take a look at our other article.