Presumptuous

/prɪˈzʌmp.tʃu.əs/ adjective medium

Overly bold or confident in a way that oversteps proper limits, without the right or permission to do so.

It felt presumptuous for the new hire to redecorate the shared office before even meeting his coworkers.

Memory Trick

'Presumptuous' contains 'presume' - a presumptuous person presumes far more license than they have actually been given.