You have to initiate the rate though you can inquire about their budget. I wouldn't charge separate rates. As soon as you do this, you open yourself up to nee

You have to initiate the rate though you can inquire about their budget. I wouldn't charge separate rates. As soon as you do this, you open yourself up to needless bickering about how much of your time was spent on x vs y. It becomes complicated to separate sessions that are programming intertwined with technical discussion.