Castle Rock storage container costs are usually based on the size of the storage unit and the length of the rental. Longer periods of rental can be cheaper than daily or weekly rentals. A storage container can cost between $100 to $200 per month depending on the size of the storage container. The usual sizes available are 7 feet, 12 feet, and 16 feet. A 12-foot storage container usually costs around $100 up to $150. It is estimated that belongings from a 1,200 square foot house can fit a 12-foot storage container, provided that the furniture and belongings will be organized and arranged accordingly. Content for a $50 to $512 square foot home is said it can fit a 16-foot storage container in Castle Rock. However, it will be more cost-effective just to rent a 7-foot storage container if the home renovation only includes one to two rooms in the house.