Charleston, NY Sheds, Carports, Garages and accessory dwelling Units for Sale Sheds for sale in Charleston, NY have an average price of $662.50 with an average square footage of 18. The average cost per square foot is $36.81. ShedHub.com is aware of 1 dealers within 20 miles of Charleston NY. The most popular shed styles at these locations are High Barns, Mini Barns, and Garages.