Replacement lock question (from a noob)

nLdn

Hi,

I'm fairly new to dealing with locks, beyond replacing a latch barrel now and then.

I recently purchased an ex council flat and need to replace one of the locks.

On my front door, there are three locks but I was only given sets of keys for 2 of them. They are (1) some sort of special security key night latch (pretty hefty piece of hardware), (2) a regular mortice lock, (3) a mortice lock that on the inside has a thumb lever to be able to lock and unlock from inside without a key.

It is number 3 that I dont have the key for but would like to be able to use so that at night we can feel a bit more secure by locking 1 and 3 and in the event of an emergency we can easily get out without a key.

Lock 3, I think, is part of the regular door lever mechanism.

I'd like to buy a replacement for (3) that I can swap with whats there but being a noob to all this, I have no idea how I even describe this kind of a lock when searching online.

Can anyone help?

stator

Is it a UPVC door? Post a photo.

Ectophile

If it's a modern one, and part of the regular door mechanism, then it may be a "euro lock". If that's the case, then they are readily available from locksmiths, and can be replaced just by undoing one screw. They come in various lengths, and you need to make sure you get the right length. In particular, if it's too long on the outside, then it's easier for burglars to attack the lock and break it.

If you Google "euro lock" you should get plenty of pictures of what they look like.

shaun_from_Africa

If as Ectophile suspects, (and I think that they are correct), it is a eurolock, this page will give you all the info you need:
http://www.upgrademylock.com/upgrade-my-lock/how/

FreeBear

nLdn wrote: »

(3) a mortice lock that on the inside has a thumb lever to be able to lock and unlock from inside without a key.

Sounds like a deadbolt lock - If you turn the thumb lever, you'll probably see a bolt shoot out from the lock. Operating the lock with the key will shoot out a separate bolt. It may or may not use a euro-cylinder. Depends on the age of the lock and who made it.