Calwa, CA Sheds, Carports, Garages and accessory dwelling Units for Sale Sheds for sale in Calwa, CA have an average price of $12356.25 with an average square footage of 200. The average cost per square foot is $61.78. ShedHub.com is aware of 1 dealers within 20 miles of Calwa CA. The most popular shed styles at these locations are High Barns, Mini Barns, and Garages.