[header] How to tell your parents you intend to move out when you turn 18 [title] Start mentioning the idea of moving out when you haven't even reached 18 years old. [step] Start a few months to a year before. Make sure to find the right time to tell them your intention. 
Don't tell them when they are in a bad mood. If you do, your parents will know that you want it badly, and they will have time to consider their decision (whether it be' yes' or' no').