2018 Deck Repair Costs: Cost To Replace Deck Boards, Fix RailingHomeAdvisor's deck repair cost guide surveys homeowners to reveal the average price for repairing a deck, replacing deck boards and fixing deck railings. ... Labor Costs; wood or Composite deck; deck Railing repairs; Popped Nails & Screws; Anchoring deck Stairs; Mold & Rot; Mildew Issues; Pest Control; deck Board Issues. Cost to Replace deck Boards. Cedar; Treated Lumber; Redwood; Hardwood; Exotic wood; Composite wood .... Some are wood mixed with plastic.