Moving into a new home is exciting, but the first security question is simple: who else still has a key? Previous owners, tenants, cleaners, dog walkers, contractors, estate agents, relatives and neighbours may all have held copies. Even if everyone is honest, you cannot audit keys you have never seen. That is why changing the key control on external doors should sit near the top of any moving-in checklist.
According to UK industry specialists LocksmithLocal, there are two main routes: rekey the existing locks or replace them. Rekeying changes the internal pins, levers or wafers so the old key no longer works. Replacing means removing the old lock or cylinder and fitting a new one. Both can be correct. The best choice depends on the lock type, current condition, security level and your budget.
What rekeying actually means
Rekeying keeps the lock body but changes the key that operates it. On some systems this is efficient. The locksmith removes the cylinder or lock, changes the internal combination and supplies new keys. Old keys are then useless. This can be useful for landlord portfolios, commercial suites and certain higher-grade cylinders where the hardware is still good.
In many UK homes, however, a full rekey is not always the cheapest or most practical option. A common euro cylinder on a uPVC or composite door can often be replaced quickly for a similar cost, especially if the existing cylinder is basic or outdated. On some mortice locks, rekeying may be possible, but replacement may still be better if the lock is worn, lacks the right standard or has an old keyway that is easy to copy.
What replacement gives you
Replacing the lock or cylinder gives you a clean start. It invalidates old keys, lets you upgrade to modern security and allows the locksmith to correct sizing or wear problems at the same time. For a new homeowner, replacement is often the simplest decision because the existing locks may be unknown, badly fitted, low-grade or past their best.
On uPVC and composite doors, replacing the euro cylinder is usually enough if the multi-point mechanism is healthy. On timber doors, replacement may involve a mortice deadlock, mortice sashlock or night latch. On patio or French doors, it may involve cylinders, hook bolts or auxiliary locks. The locksmith should inspect the whole door, not just the keyhole.
When rekeying makes sense
Rekeying is worth considering when the lock hardware is already high quality, correctly fitted and in good condition. It can be useful where multiple locks are part of a designed key system, where the customer wants to keep a restricted key profile, or where replacing the visible hardware would be disruptive. It is also common for businesses that need to remove an ex-employee’s key access without changing every lock case.
For a house move, rekeying may be sensible if the property already has premium cylinders, if the locks are fairly new, or if you want several doors to work from one key and the system is designed for it. The key word is designed. Simply making all doors accept one key without considering door use, escape routes and security is not proper key planning.
When replacement is the better option
Replacement is usually better when you cannot identify the standard of the current lock, the key feels rough, the cylinder protrudes from the handle, the door has been forced, the lock is old, or the hardware does not meet your insurer’s expectations. It is also best when the lock type is low-security or when parts are worn enough that rekeying would only hide a deeper reliability problem.
New homes often expose small faults quickly. You may find one door needs lifting hard to lock, a side door has a cheap cylinder, a garage door has a flimsy lock, and a back door cylinder sticks out too far. A moving-in visit is a good moment to deal with those issues together rather than paying for separate call-outs later.
Do you need one key for every door?
Keyed-alike locks can be convenient. One key for front and back doors reduces key clutter and is helpful for families. But convenience should be balanced with risk. If one key is lost, every keyed-alike door it opens may need changing. For some households, a split system is better: one key for daily doors, a separate key for garage or outbuildings, and restricted access for lodgers, cleaners or carers.
If you run a holiday let, shared house or rental, key control matters even more. Standard keys can be copied without your knowledge. Restricted key systems limit copying to authorised people and can make future changes easier to manage. They cost more upfront but can reduce risk over time.
Do not forget doors beyond the front door
New owners often change the front door and forget the rest. Walk the perimeter slowly. Check back doors, side gates, garage personnel doors, integral garage doors, patio doors, French doors, garden offices, sheds containing tools, basement doors and accessible windows. Intruders do not care which door you use most; they care which one gives way fastest.
Also check whether any door is an escape route. Locks that require a key to exit may be inappropriate in some settings, especially shared or commercial-style properties. In an ordinary home, security still needs to allow safe exit. Thumbturn cylinders can be useful, but they must be chosen with care on doors with letterplates or glass near the lock.
Questions to ask after moving in
A good moving-in lock assessment should answer these questions:
- Which external locks are currently fitted?
- Do they meet the right security standard for the door?
- Are any cylinders too long or vulnerable to snapping?
- Are the doors aligned and locking smoothly?
- Can old keys be made useless by rekeying or is replacement smarter?
- Would keyed-alike locks make life easier or increase risk?
- Are any window, garage or patio locks weak points?
This turns the decision from guesswork into a practical security plan.
Cost and value
Rekeying can be cheaper if the lock is designed for it and no upgrade is needed. Replacement can be better value if the existing lock is old, weak or awkward. The wrong decision is paying to preserve poor hardware simply because it is already there. The right decision is the one that gives you reliable locking, key control and insurance-sensible security at the lowest sensible cost.
Ask for a fixed quote before work begins. The locksmith should explain whether they are rekeying, changing a cylinder, changing a full lock case, replacing a mechanism or adjusting the door. Those are different jobs with different prices.
The practical recommendation for most new homeowners
For most UK house moves, replacing the cylinders or locks on external doors is the cleanest option. It removes uncertainty, lets you upgrade weak points and gives you fresh keys from day one. Rekeying remains a good tool where the hardware is already worth keeping or where the property has a planned key suite.
If you have just moved and want old keys invalidated without wasting money, LocksmithLocal can inspect the door, explain whether rekeying or replacement is the right route, and provide professional lock changes and repairs with practical advice on British Standard, anti-snap and keyed-alike options.