ᐅ How can the lock be replaced here?

Hello,

I have a door handle with a lock in the basement. The key can only be inserted from the outside. I want to replace the lock cylinder with one that can also be locked from the inside.

My question is: Can I remove the lock the usual way by unscrewing the side screw and pulling out the cylinder? And is it possible to install a lock that I can then lock from inside? Or is that not possible because the interior side is covered? I plan to install a Nuki digital lock there, which will have a key on the inside that can be turned.

What speaks against it? Okay, at most, that you are probably only referring to the "lock cylinder" and not the "lock" itself, right?

You just have to check – I’m not sure if the NUKI 1/2 still exists at all...

Yes, I am, of course, only referring to the cylinder lock. Until now, mine always looked different. Is it correct that I only need to unscrew the one side screw and then can pull out the cylinder lock using the key?

Yes, simply remove the screw, insert the key, and measure. A cylinder always has two dimensions, for example 60mm (2.4 inches) on the left and 40mm (1.6 inches) on the right, or 50mm (2 inches) / 80mm (3.1 inches), etc. There are double-sided cylinders, and even options that allow you to leave the key inside "if there is enough space" while still being able to unlock from the outside.