Usually, yes you will. The main point of mediation is that you and your former partner/spouse communicate constructively to find solutions to whatever issues there are between you. Whilst sometimes, you can mediate effectively by remaining in separate rooms (known as shuttle mediation), it works better if you can be in a room together to talk things through. If being in the same room is an absolute no, the reasons for this need to be considered and if you really want to go ahead with mediation, a shuttle mediation may work for you.