Changing the Locks When You Move into a New Home

When you collect your keys from an estate agent or the previous owner, you are receiving the keys that exist right now — but you have no record of how many sets were cut over the years the property was occupied. A family living in a house for a decade might have given out keys to a neighbour for emergencies, a cleaner, a dog walker, a grown-up child who moved out, and a tradesperson who was supposed to return the spare but never did. If the property was rented, the letting agent may hold a master set, and former tenants may still have copies. None of this is malicious — it is simply the reality of how homes accumulate key history. Changing the locks on the day you move in, or as close to it as possible, draws a clean line and means only the people you choose have access from that point forward.

There is also a practical insurance angle. Many home insurance policies require a five-lever mortice deadlock to BS3621 standard on timber front and rear doors, and an anti-snap euro cylinder on uPVC or composite doors. If the existing locks do not meet those standards, a break-in claim can be complicated. Getting the right locks fitted from the start keeps both your family and your policy in good shape.

These four words are often used interchangeably, but they mean different things and affect what a locksmith needs to do. A lock change means removing the existing lock mechanism and fitting a new one of the same or similar type in the same position — the most common job on a move-in day. A replacement is similar but usually refers to swapping out a failed or damaged lock for one that works correctly. An installation means fitting a lock where there was none before, which involves cutting new holes and may require additional work to the door. A repair means fixing a lock that is partly functional but has a fault — a worn latch, a stiff cylinder, a misaligned keep — without necessarily replacing the whole unit. When you call Erith Locksmiths, we will ask a few quick questions about your door type and the existing hardware so we can tell you exactly which of these applies and confirm a clear, up-front price before anyone sets off.

[4] One term worth knowing for new homeowners: in the UK, the equivalent of what some countries call changing the cylinders is here referred to as changing the cylinder. On a uPVC or composite door, the euro cylinder is a removable component that can be swapped out without touching the rest of the multipoint lock body. On a timber door with a Yale-type nightlatch, the cylinder can similarly be changed without replacing the entire lock case. This is often the quickest and most cost-effective option when the lock mechanism itself is in good condition.

The majority of front doors fitted to homes built or refurbished in the last twenty-five years or so are uPVC or composite. These doors use a multipoint locking system — a mechanism that throws multiple bolts up and down the door edge when the key is turned — with a euro cylinder as the key-operated component. The euro cylinder is the oval-shaped barrel you insert your key into. Standard euro cylinders have a known vulnerability: they can be snapped with a sharp blow, which allows the lock to be opened in seconds. This is not a theoretical risk — it is a well-documented method used by opportunistic burglars across London and the south-east, including in areas like Belvedere and the wider DA postcode.

The solution is straightforward: fit an anti-snap euro cylinder, ideally one rated to TS007 3-star standard. These cylinders are designed with a deliberate break point away from the cam that operates the lock, so even if the visible part is snapped off, the door remains secure. At Erith Locksmiths we carry anti-snap, anti-pick, and anti-drill cylinders and can advise on the right grade for your door. uPVC door lock repair Belvedere is one of the most common calls we receive, often from homeowners who have just discovered their existing cylinder is a standard, unprotected type. If you are moving in and the cylinder has not been upgraded, that is the first conversation to have.

Older properties — Victorian and Edwardian terraces are common in Erith and around Lessness Heath — tend to have solid timber front doors fitted with a Yale-type nightlatch on the upper part and a mortice deadlock lower down. The nightlatch is the spring-loaded lock that catches automatically when you pull the door shut, while the mortice deadlock requires a deliberate key turn and throws a solid bolt into the door frame. Insurance companies typically require the mortice lock to be a five-lever type to BS3621. If your new home has a two- or three-lever mortice lock, it may not meet that standard and should be upgraded.

Installing a mortice lock in a door is more involved than changing a euro cylinder. The locksmith needs to remove the existing lock case from the pocket cut into the door edge, fit the new case, and ensure the bolt aligns precisely with the keep on the frame. On a move-in day, it is also worth checking the condition of the door frame and keep itself — a loose or splintered keep defeats the purpose of a good lock. We carry out door lock replacement Belvedere on both timber and uPVC doors and always check the full door-and-frame assembly, not just the lock in isolation. If anything needs reinforcing, we will tell you before starting work so there are no surprises on the invoice.

Sometimes a move-in day does not go smoothly. Keys get handed over late, a lock is stiff from years of disuse, or a door simply will not co-operate. If you find yourself locked out of your house — whether it is your first day or any other — the first practical step is to stay calm and work through a short checklist before calling anyone. Check whether any other door or ground-floor window has been left open. Ask whether a family member or the estate agent still has a key. If the property has a rear garden, check whether access from the back is possible. These are the only steps worth trying yourself — do not attempt to force a door, as this can cause damage that makes the eventual locksmith job more complicated and costly.

Once those options are exhausted, calling a professional is the right move. A skilled locksmith can get into a deadlock or a multipoint uPVC lock using non-destructive entry techniques in the vast majority of cases, meaning the door and lock are undamaged and can still be used afterwards. At Erith Locksmiths we are available around the clock — if you are locked out Belvedere or anywhere in the Erith area at any hour, call us on 020 3757 5599 and we will send someone straight away. We are usually with you in about 30 minutes. The price is confirmed with you on the phone before we set off — the factors that affect the quote include the type of lock, whether non-destructive entry is possible, the time of day, and travel distance — so you will not be presented with an unexpected bill on the doorstep. When you are ready to look at changing the locks on the same visit, we can do that too.

Erith Locksmiths is a fully insured, mobile locksmith service operating across Erith, Belvedere, Abbey Wood, Thamesmead, and the broader DA postcode. We work evenings, weekends, and bank holidays — the same trained locksmiths, the same up-front pricing, regardless of when you call. As an emergency locksmith Belvedere residents and new homeowners rely on, we know the local housing stock well: the mix of period terraces around Erith town centre, the more recent uPVC-doored new-builds along the riverside, and the flats in converted properties where communal entrance locks add an extra consideration. If you are moving into a flat, bear in mind that the building's managing agent or landlord may control the communal door, so it is worth having a clear conversation with them about what can and cannot be changed on shared entrances — we can advise on this when we arrive.

Whether you need a straightforward euro cylinder swap, a full five-lever mortice lock installation on an old timber door, or an emergency locksmith call because the keys have gone missing before you have even finished unpacking, we are ready to help. Our lock change Belvedere service covers the full range of residential door types, and because we arrive with a well-stocked van, most jobs can be completed in a single visit without waiting for parts to be ordered. Call 020 3757 5599 — we answer 24/7 and we will give you a clear, honest price before any work begins.