The cost is based upon two main factors, the preparation for the mediation and the mediation itself. The preparation will include the time needed by you and your attorney to prepare a summary of your case and relevant documents and provide that brief to the mediator. Additionally, the mediator will often charge on a hourly (or per day) basis for their time both for preparation and on the day of the mediation. Then, you attend with your attorney the day of the mediation and there is time on the day of the mediation.