Changing the Locks When You Move into a New Home

Think about the typical chain of people who have held a key to your new property. The previous owner may have had builders, cleaners, dog-walkers, or family members with copies. If the property was rented, the letting agent, the former tenant, and potentially sub-tenants may all have had sets cut at some point. Even the most conscientious vendor cannot account for every copy ever made. A lock change on day one closes that gap entirely and costs far less than the alternative. Home insurers increasingly ask whether locks meet British Standard BS3621 — so a lock change is often the moment to upgrade to a compliant fitting at the same time, which can also affect whether a claim is paid out in full should the worst happen.

It is worth noting that if you are ever in the position of being locked out Sidcup residents will tell you just how stressful that is — but that is a different scenario. The goal here is to prevent anyone else from walking in with a key you do not know exists. Prevention is always simpler than recovery, and a professional lock change Sidcup homeowners can rely on is a straightforward, one-visit job.

The right approach depends on what type of door you have, and most homes in the Sidcup area have at least one of each. Timber front doors — common in the older terraced and semi-detached houses you find along roads like Halfway Street or near Sidcup High Street — typically have two locks working together: a Yale-type nightlatch on the upper part of the door and a 5-lever mortice deadlock set into the door edge. Replacing the nightlatch is a quick cylinder swap. The mortice deadlock is a more involved job: a skilled locksmith will remove the existing lock body from the door, check the mortice pocket dimensions, and fit a new 5-lever lock that meets BS3621 if the existing one does not. The process is clean and leaves the door fully functional and insured-compliant.

uPVC and composite doors — the type fitted to most homes built or refurbished from the 1990s onwards — work differently. They use a multipoint locking mechanism along the full height of the door, operated by a single handle, and the security-critical component is the euro cylinder that the key turns. This cylinder can usually be swapped in under 20 minutes without touching the multipoint mechanism itself, which is why door lock replacement Sidcup on uPVC doors is often quicker than people expect. The important upgrade to make at the same time is fitting an anti-snap, anti-pick, anti-drill cylinder rated to TS007 3-star. Lock snapping — where a burglar breaks the exposed part of a standard euro cylinder — is a well-documented method in this part of London, and a 3-star cylinder defeats it. We will always tell you honestly which upgrade is needed and which is not: we never carry out unnecessary work, and if your existing cylinder is already high-security, we will say so.

Sometimes a lock does not need replacing outright — the multipoint mechanism may be misaligned, the handle droop may be making it hard to engage the lock, or the cylinder may turn stiffly because of wear rather than a security concern. In those cases, our approach to upvc door lock repair Sidcup is to diagnose first and recommend only what is genuinely required. A realigned keep plate, a lubricated mechanism, or a new cylinder alone can restore a door to full working order without the cost of a complete mechanism replacement. That said, if the mechanism itself is faulty — if hooks or bolts are not throwing fully — a repair that leaves the door insecure is not worth having, and we will explain the difference clearly before any work begins.

For back doors, patio doors, and French doors, the same principle applies. These are frequently overlooked when moving in because attention goes to the front door, but they are common points of entry. If your new home has uPVC patio or French doors, ask us to check the cylinder and the multipoint lock on those at the same time — it is far more efficient than a second visit later.

Even with new locks fitted, there are moments when things go wrong — a key left inside, a latch that drops when you step into the garden, or a lock that develops a fault. If you find yourself in that situation and are wondering what to do when you're locked out of your house, the first steps are straightforward: check every ground-floor window and other external doors before assuming you need help, and see whether a trusted neighbour holds a spare key. Do not attempt to force entry yourself — it risks damaging the door frame or lock beyond easy repair, and it can raise concerns with neighbours or passers-by. What to do when you get locked out of your house if none of those options apply is simple: call a professional. A trained locksmith can open the vast majority of doors without damage and without compromising the lock for future use. As a 24 hour locksmith Sidcup and the surrounding areas rely on, we answer the phone at any hour — whether it is 2pm on a Tuesday or 11pm on a bank holiday.

If you are concerned about what to do when you are locked out of your house and whether a locksmith can actually open a modern deadlock or high-security cylinder, the honest answer is yes — an experienced professional carries the specialist tools and knowledge to open most locks non-destructively. In cases where a lock genuinely cannot be opened without damage, we will always tell you before we proceed and explain the options. Prevention is better, though: once your new locks are fitted, make a habit of leaving a spare key with someone you trust rather than under a plant pot or in the letterbox.

When you call us, we ask a few quick questions — the type of door, the type of lock, and your postcode district — so we can give you an exact, confirmed price before we set off. The factors that determine the final quote include the lock type and specification, the number of doors, any parts required, and the time of day, since work carried out on evenings, weekends, and bank holidays is priced accordingly. There are no surprise additions when we arrive: the price agreed on the phone is the price you pay. We are fully insured and our locksmiths are experienced professionals who work across Sidcup, Foots Cray, Bexley, Chislehurst, and the surrounding DA and BR postcode districts.

Whether you need a straightforward cylinder swap on a uPVC door, a full 5-lever mortice deadlock installation on a timber front door, or an emergency locksmith Sidcup call-out in the middle of the night, our team is ready. We send a locksmith straight away and are usually with you in about 30 minutes. Call 020 3757 5665 — we answer 24/7 and are always happy to talk through what you need before you commit to anything.