1 For about $5,000, a full-service planner will plan the wedding and handle most details and the wedding day. 2  That rate sometimes goes much higher -- possibly $10,000 or more for an in-demand planner with ten years or more experience, according to i-do Weddings. The average total cost for a wedding consultant is $3,636 in the northeast and $2,635 in the south. 2  The national average is $3,262, according to The Association of Bridal Consultants.