You have the boxes in, the kettle on, and a long list of jobs still waiting. It is exactly at this point that many people put off one of the most sensible security steps – to change locks after moving house. The reason is simple: you cannot be sure who still has a key, and that uncertainty is not something most homeowners or tenants are comfortable living with.
Should you change locks after moving house?
In most cases, yes. It is one of the quickest ways to take control of your property security from day one.
When you move into a house or flat, you usually inherit more than the building itself. You also inherit its access history. Previous owners, old tenants, relatives, neighbours, cleaners, dog walkers, tradespeople and letting agents may all have had keys at some point. Some will have returned them. Some may have forgotten they still have one. Some keys may have been copied years ago and never mentioned during the sale or tenancy handover.
That does not mean anyone intends to misuse access. But good home security is not built on assumptions. It is built on certainty. Replacing or reconfiguring the locks means you know exactly who can get in.
The real risks of keeping the old locks
The biggest risk is not always forced entry. It is unauthorised access without signs of damage. If someone can open a door with a working key, there may be no obvious evidence of a break-in. That can create stress, confusion and, in some cases, insurance complications.
There is also the issue of lock quality. A lot of homes change hands with whatever lock happened to be on the door at the time. That could mean a worn cylinder, an older euro lock vulnerable to snapping, or a front door that never had the right level of protection in the first place. Moving house is often the first proper chance to review whether the locks are still fit for purpose.
For landlords, the point is even clearer. A change of occupancy should trigger a serious look at access control. If you cannot verify who holds keys from a previous tenancy, replacing the locks is the sensible option. It protects the new tenant and reduces avoidable risk.
When changing the locks is essential
Sometimes this is not a matter of preference. It is the right thing to do straight away.
If you have moved into a property after a relationship breakdown, probate sale, repossession or a rushed chain completion, key control is often unclear. The same applies if the seller has handed over fewer keys than expected, if doors feel stiff or damaged, or if any lock looks old, loose or mismatched.
You should also act quickly if the property has signs of previous security issues. Scratches around the cylinder, poor alignment, repaired door frames or temporary fixes can all suggest the lock has had a hard life. In those cases, replacing the lock is not just about old keys. It is about making sure the door secures properly now.
When you might not need a full replacement
There are a few cases where a complete lock change may not be necessary, but this depends on the lock type and condition.
Some locks can be rekeyed or have the cylinder changed without replacing all the door furniture. That can be a practical option if the mechanism is in good order and you simply want to reset access. On uPVC and composite doors, for example, changing the cylinder is often enough if the multipoint mechanism is working correctly.
The point is that it depends on the door, the lock, and the condition of the existing parts. A proper inspection tells you whether you need a straightforward cylinder swap, a new mortice lock, a night latch replacement or a wider repair.
Which locks should be checked first?
Start with the obvious entry points: front door, back door, side door and any garage access that connects into the house. Then look at patio doors, porch doors and ground-floor windows with locks.
Not every lock needs changing on day one, but external doors should be the priority. If a property has multiple entrances, one weak point can undermine the stronger ones. A high-security front door lock is useful, but less so if an old rear door cylinder can be bypassed easily.
For flats, the communal entrance does not remove the need for your own door security. Your front door is still the final barrier between your home and everyone else with access to the building.
What type of lock is best after moving in?
That depends on the door and how you use the property. There is no single lock that suits every home.
For many modern doors, especially uPVC and composite doors, upgrading to a high-security anti-snap euro cylinder is a strong move. A 3-star cylinder is a popular option where you want better resistance against snapping and other common attack methods. For timber doors, a compliant mortice sashlock or deadlock may be the better choice, often alongside a night latch where appropriate.
The best setup is the one that matches the door construction, meets the right standard, and works reliably in daily use. Security matters, but so does practicality. A lock that jams, sticks or fails to align properly is a problem waiting to happen.
Don’t ignore the condition of the door itself
People often focus only on the lock, but the lock is only one part of the security picture. If the frame is weak, the keep is loose, the handles are damaged or the door has dropped, simply fitting a better cylinder may not solve the issue.
This is common with uPVC and composite doors, where alignment problems can make locking difficult and put strain on the mechanism. In those cases, the right fix may involve adjustment or repair as well as lock replacement. A secure home needs the whole door to function as it should.
Can you change locks yourself?
Some people do, especially when swapping a basic cylinder. But there is a difference between fitting a part and knowing the door is secure.
DIY work can go wrong in small but costly ways. The wrong size cylinder can leave the lock exposed. A poorly fitted mortice lock can weaken the door. On multipoint doors, forcing parts into place can create alignment issues or damage the mechanism. If you are not sure what lock standard you need, or whether the door already has wear and tear, a professional fitting is usually the safer route.
That matters even more if you have just moved and are already dealing with decorators, deliveries and paperwork. Most people want the job done properly, quickly and without trial and error.
How quickly should you do it?
Ideally, on the day you move in or as soon as possible after. The first 24 to 48 hours are when most people realise they do not actually know who still has access.
If your move happens late, at the weekend or outside normal working hours, it still makes sense to get the locks dealt with promptly. For households across Birmingham and the West Midlands, that often means calling a locksmith who can respond quickly rather than waiting days while the old keys remain active.
A sensible chance to upgrade security
Moving house is not only about replacing unknown locks. It is also a practical opportunity to improve what is there.
If the property has older cylinders, it may be worth upgrading rather than replacing like for like. If the rear door has a tired mechanism or the side entrance feels vulnerable, sorting it now can save hassle later. The same goes for landlords preparing a property between tenancies. A planned lock change is usually easier and cheaper than dealing with an emergency after a failure or security incident.
A professional locksmith can also spot issues you might miss, such as poor fitting, non-compliant locks or signs of attempted entry. That extra pair of trained eyes can make a real difference when you are taking over a property for the first time.
What to expect from a proper lock change
A good locksmith should explain what is fitted now, what needs replacing, and what your options are. The work should suit the type of door, the level of security required and your budget. You should also know what guarantee is offered on parts and whether the work has been carried out to a professional standard.
That matters because lock changes are not all equal. Fast service is helpful, but so is clear advice, clean workmanship and confidence that the job has been done right. If you are trusting someone with your home security, credentials and accountability count.
For a family home, rental property or business premises, changing the locks after a move is one of the simplest ways to remove uncertainty. You cannot control who had a key before you arrived, but you can control who has one now. If there is one job worth doing early, this is it.