Hey everyone, I’m currently on the hunt for a smart lock for my front door, but I have a bit of a challenge. I live in a 1970s house in the Netherlands, and here we have what’s called a ‘build-on’ lock system. While there are plenty of smart lock options available for standard doors, I’m struggling to find any that are designed for build-on systems. Does anyone have any recommendations or experiences with this? I’d love to hear your thoughts and maybe find a solution together! 
locksmith