Yes, these types of structures are permitted but they must be accessory (secondary) to a principal use. Accessory structures must comply with the required front setbacks for the principal structure to which they are secondary. They must also be setback a minimum of 2 feet from the side and rear lot lines with some minor exceptions. Sheds in residential zoning districts can be no larger than 200 square feet. All accessory structures must comply with the impervious lot coverage found here.