Can you lock the doors for specific Sim you Sim knows? I know you can do so with household members but what about neighbours? I never lock my doors and yes the intruders can be annoying. Although in one highrise I have fixed it. Almost. Raj has neighbours from 2 apartments (Johnny Zest in one apartment and Zoe and her boyfriend and toddler in the other) and I had Raj give ALL of them keys (except the toddler of course). That way, their intrusions can be looked upon as an oportunity to socialize. Or just to ignore. Also, the intruders are very thoughtful and actually take out the trash. I also find that with high friendship, the noisethings from them aren't as prevalent as if they were strangers. That could be a coincidence though.