Lots of sustainability consulting occurs remotely - in fact, you may find that only 10-20% of billable project hours are spent onsite at your facilities. That means you need to get comfortable with working in a non-face-to-face relationship with your consultant team.

So before you commit, find out how often they expect to be in contact, what forms of communication are preferred, and how they deal with regular status updates. There is no right answer here, but the key is to discuss the options and find a mutually agreeable working relationship.