Storage sheds, tool sheds and play houses that have a foot print of less than 120 square feet do not require a building permit however do have other restrictions. . In the event you bring a utility such as electricity or water to the structure, or enclose mechanical equipment such as a well or pool pump, permits are required. Electrical, plumbing and mechanical permits are required for a structure that may not require a building permit. Sheds and playhouses are not permitted to be located in the property setbacks. This is a required open space that separates properties around the perimeter of the property. Setback distances vary based on property zoning. The Application and Permit Center 925-655-2700 will help you determine the set back requirements of your property.