Erith Locksmiths Service Team
Local locksmith team
29 Jul 2026 4 min read
Your front door is the first thing a burglar sizes up — and in areas like Erith and Belvedere, where Victorian terraces sit alongside newer builds and converted flats, the range of door types and lock standards is wide. Some homes still rely on a basic nightlatch that any credit card or simple tool could defeat. Others have been upgraded to British Standard locks that meet what most home insurers actually require. Understanding the difference is not complicated, but it does matter — both for your peace of mind and for whether your insurance pays out if the worst happens.
This guide cuts through the jargon around BS3621 mortice deadlocks, TS007 3-star cylinders, and solid nightlatches. It explains what each one does, why it matters, and how to know whether your current front door lock is genuinely doing its job. If you discover it is not — or if you are already locked out and reading this on your phone — our team at Erith Locksmiths are available around the clock. Call 020 3757 5599 and we will send a locksmith straight away, usually with you in about 30 minutes.
Frequently asked questions
How do I know if my front door lock meets British Standard BS3621?+
Look for the British Standards Kitemark on the faceplate or body of the lock — it is a small symbol that resembles a kite shape with 'BS3621' alongside it. If you cannot find it, the lock is unlikely to meet the standard. You can also check the number of levers: a BS3621 mortice deadlock has 5 levers. If you are unsure, our team can inspect the lock when we attend and advise you on the spot. This matters most if your home insurer specifies a British Standard deadlock in your policy, which many do.
How do I change a front door lock — can I do it myself?+
Changing a euro cylinder on a uPVC or composite door is something a confident DIYer can manage: undo the central screw on the cylinder, turn the key slightly to release the cam, slide the old cylinder out, and reverse the process with the new one — making sure the new cylinder is the correct size and specification for your door. However, changing or installing a mortice deadlock in a timber door requires accurate mortice cutting and frame alignment that is easy to get wrong, and an ill-fitted lock can offer less security than the rating suggests. For most homeowners, calling a professional locksmith is the more reliable route, particularly if you want the work to meet insurance requirements. We can handle a front door lock change same day across Erith, Belvedere, and the surrounding DA postcode districts — call 020 3757 5599 to arrange it.
What should I do if I am locked out of my house in Belvedere?+
First, check whether any other door or window is accessible from the outside — sometimes a back door or a ground-floor window that is not fully latched offers a legitimate way back in without damage. Check whether a neighbour, family member, or letting agent holds a spare key. If none of those options apply, call a professional locksmith rather than attempting anything that could damage the door or lock. Our team covers locked out Belvedere call-outs around the clock — we will ask a few straightforward questions to confirm you are the householder or have the right to access the property, and then we work to open the door with the least possible disruption. In a genuine emergency, call 020 3757 5599 and we will send someone straight away.
What factors affect the price of a lock change or door lock repair?+
Several things go into the final quote: the type of lock or cylinder being fitted (a TS007 3-star cylinder, a BS3621 mortice deadlock, or a multipoint mechanism each have different costs and fitting times), whether parts are needed and what specification they are, the time of day (evenings, weekends, and bank holidays affect pricing), and the distance our locksmith travels to reach you. We confirm an exact price before any work begins, so there are no surprises when the job is done. Call 020 3757 5599 and we will give you a clear quote over the phone before anyone sets off.
