A session books the room, the gear and a person at once. Planning only the room means discovering the engineer is somewhere else that day.
The file is the product and weighs gigabytes. Filing per project with versions decides whether a mix from two years ago returns in five minutes or never.
Rights are written into the project itself, on the day of the session. Who holds what share and who may publish the recording is a question that surfaces three years later, when nobody remembers.
The deposit protects the calendar. A day held without payment is an empty day with paperwork, and it happens more with bands than with companies.
An hour does not equal an hour. Tracking, mixing, mastering and session players are four rates, and a quote without that split ends in an argument.
Sign-off needs a round and, above all, a written limit. Two revision passes included in the price and every further one charged is the sentence that finishes a project instead of prolonging it.