Manuals and Emotional childhood with children


I have a question around adult children. I understand that you can have expectations around cleaning up, keeping spaces tidy etc.  However, I am curious to understand what happens when these expectations aren’t met.  Like the young adult leaves things around the house, makes a mess in common areas and doesn’t clean it up.  How does one respond to this?  I understand it’s up to them whether they do it.  It’s their choice.  However, if by not doing what is expected, it creates continued mess and chaos.  This is not sustainable.  How does one set boundaries/consequences around this?  I have boundaries about keeping things tidy as we all live in a small space.  I am just not sure on the consequences to create.