Changing the Locks When You Move into a New Home

The moment completion happens and the keys are handed over, the legal ownership of the property transfers to you — but the physical security does not automatically follow. Every key cut from the original barrel during the previous occupancy remains a working key until the cylinder or lock is replaced. That includes keys that were lost, never returned, or quietly duplicated without the owner's knowledge. Locksmiths across London see this scenario regularly: a new homeowner assumes the keys they received are the only ones in circulation, only to discover later that they were not. Changing the locks on day one closes that gap entirely.

There is also an insurance angle worth knowing about. Many home contents and buildings insurers ask, as a condition of your policy, that front doors are fitted with a five-lever mortice deadlock that meets BS 3621. If your new home has older locks that do not meet that standard, you may find a claim is complicated or refused. A professional lock change is therefore not just about peace of mind — it can be a practical requirement of your cover. If you are unsure what standard your existing locks meet, an experienced locksmith can inspect them and advise you honestly.

The work involved depends on the type of door you have, and Eltham's housing stock covers the full range. Older properties — particularly the interwar semis around Eltham Park and the Edwardian terraces closer to the town centre — tend to have timber front doors. These typically carry two locks: a Yale-type nightlatch (the one you pull the door shut on) and a five-lever mortice deadlock set into the edge of the door. Replacing the nightlatch means swapping the cylinder and the external barrel. Replacing the mortice deadlock means fitting a new lock body into the existing case or, if the case is worn, cutting a new pocket — a job that requires skill and the right tools, not a DIY afternoon.

uPVC and composite doors — far more common in newer Eltham properties and in housing association stock — work differently. They use a multipoint locking mechanism: when you lift the handle and turn the key, multiple bolts shoot into the frame at once. The key-operated part of this system is a euro cylinder, a small oval barrel that sits in the centre of the door. Replacing it is quicker than swapping a mortice deadlock, but the detail matters enormously. Standard euro cylinders are vulnerable to a technique called cylinder snapping, where an attacker breaks the outer section of the barrel to expose the mechanism. Fitting an anti-snap, TS007 3-star rated cylinder closes this vulnerability. Any door lock replacement London homeowners commission for a uPVC or composite door should specify an anti-snap cylinder as a minimum — it is not an optional upgrade, it is the current security standard.

When a locksmith visits to carry out a lock change, part of the job is making sure the replacement hardware is appropriate for your door, your insurer, and your situation. For timber doors, BS 3621 is the benchmark: a five-lever mortice deadlock to that standard has a 1,000-key differ (meaning the chance of another key fitting your lock by accident is negligible) and is resistant to picking and manipulation. For uPVC doors, the TS007 3-star rating — either achieved by a single 3-star cylinder or a combination of cylinder and handle ratings — is what insurers and the police crime prevention message both point to.

If you have moved into a flat in a block, the picture is slightly more involved. Your own front door should be changed just as it would be in a house. The communal entrance door is shared with other residents or managed by the freeholder or managing agent, so changing that lock is not normally something you can do unilaterally — but it is worth raising with the building manager if you have any concern about key security. A professional locksmith can advise on the right conversation to have and can carry out your own door to the highest standard regardless.

Need help today? Call 020 3757 5833 and we will send a skilled locksmith straight away — we are usually with you in around 30 minutes and are available every day of the year, including evenings, weekends and bank holidays.

The days around a house move are chaotic, and it is not unusual for people to find themselves locked out London-wide every single day — keys left inside, locks that do not behave as expected, or a door that swings shut before the new set has been tested. If you are locked out of your house, the first sensible steps are: check whether any other door or ground-floor window has been left on the latch, ask whether a trusted neighbour or family member has a spare key, and try to stay calm — a locksmith can almost always get you in without damaging the door.

What to do when you are locked out of your house is a question our team handles constantly. The key thing is not to try forcing entry yourself, as this risks damaging the door, the frame, or the lock in a way that is expensive to put right and may leave the property insecure. Instead, call a professional. When you contact us, we will ask you to confirm ownership or tenancy of the property — this is standard practice for any responsible locksmith and protects you as much as it protects the property. We will confirm an exact up-front price before anyone travels to you, so there are no surprises when we arrive. Factors that shape the final quote include the type of lock, the time of day, and whether parts need to be sourced. We will explain all of this clearly on the phone.

A lock change is also an opportunity to improve on what was already there. Many homes still have locks that were installed decades ago and have never been updated. If the mortice deadlock on a timber door is old and worn, a replacement to BS 3621 is a straightforward improvement. If the euro cylinder on a uPVC door is a basic, unrated barrel, moving to an anti-snap TS007-rated version is one of the most cost-effective security upgrades available.

For uPVC door lock repair London jobs — where the multipoint mechanism itself has become difficult to operate, with the handle stiff or the bolts catching — the solution sometimes goes beyond just the cylinder. The gearbox inside the door can wear over time, particularly on doors that are used many times a day. A skilled locksmith can diagnose whether the issue is the cylinder, the gearbox, the hinges causing misalignment, or the door frame itself, and carry out a targeted repair or replacement rather than guessing. Getting this right matters, because a door that feels secure but is not properly latching at all points is a vulnerability regardless of how good the cylinder is.

Whether you are moving into a new home in SE9, upgrading existing locks, or dealing with an unexpected lockout, our team operates as a 24 hour locksmith London service — no answering machine, no call centre, just a direct line to a local team. Call 020 3757 5833 any time and we will talk you through what you need.

Our mobile team covers the full range of residential lock and door work. The services we provide include: five-lever mortice deadlock replacement to BS 3621; Yale nightlatch cylinder replacement; euro cylinder replacement on uPVC doors; anti-snap TS007 3-star cylinder fitting; multipoint lock gearbox replacement; uPVC door mechanism repair; composite door lock servicing; timber door lock repair; front door lock change after a house move; lock change after a break-in; emergency locksmith London response for locked-out homeowners; non-destructive entry when locked out; damaged lock replacement following attempted forced entry; door alignment and adjustment to restore a smooth lock action; fitting additional locks for improved security; replacement of worn or broken door handles linked to multipoint systems; letterbox anti-tamper fitting as part of a security upgrade; hinge bolt fitting on outward-opening doors; fitting door reinforcement hardware around the lock area; full lock audit of a newly purchased home; communal door lock advice for flat residents; sash window lock fitting on timber sashes; French door and patio door lock replacement; lock change for a property between tenancies; and overnight or bank holiday emergency callouts across all London postcodes we serve. If your situation is not on this list, call us — if it involves a door lock, we can almost certainly help.

The locksmith trade in the UK is unregulated, which means anyone can set up and start trading. When you are searching for an emergency locksmith London or a lock change London specialist, it is worth knowing what to look for rather than simply picking the first result. Ask whether the locksmith is insured — we are fully insured, and you should not let anyone uninsured work on your locks. Ask whether they will give you a confirmed price before they start work, not an estimate that shifts when they arrive. Ask whether they carry the parts for your door type, as a mobile locksmith who arrives without the right cylinder wastes your time and may leave the job incomplete.

Be cautious of anyone who refuses to verify your right to be on the property, or who cannot explain why they are recommending a particular product. A trained, experienced locksmith will listen to your situation, inspect the existing hardware, and recommend only what is genuinely needed. At Eltham Locksmith, that is exactly how we work — honest advice, confirmed pricing, and a team that arrives equipped to do the job properly the first time.