I do mostly contract work.

I have a line item called "distress surcharge" that is charged to clients who want to bother me with being in the office. Effectively doubles my rate. Helps them quit being silly.

I wish I could say "I'll definitely try that!", but (prepare for a slight off-tangent) I suffered through enough stress and burnout cycles in my life -- several times! -- that I can't even justify a double rate for my newly delivered suffering in fresh new customer office. Or so I think. Funny things happen to human morals and sentiments when a lot of money is involved. Maybe I should try it once and see how it goes, actually.

I am looking forward to start working with N customers on contract / consulting base but the transition is really hard. People keep treating me like a coding monkey whom they have to swindle for the lowest possible salary. Guess I have to change my LinkedIn profile dramatically, and make my own website as a start.

Bottom-line / on-topic: if you're willing to share lessons learned from your transition then you should know that you'd have a passionate and intentive listener (me).