Please note, Sheds and/or Structures under 120 square feet do require a Planning Permit.
Storage sheds that are less than 120 square feet and eight feet in height do not require a building permit, but still require Planning Division approval through an over-the-counter application called a Zoning Clearance.
Projects that DO NOT need a building permit are simple surface (cosmetic) projects; minor repairs and replacements; and minor site improvements or small structures.
The floor area mustn't be more than 15m2 (although you might be able to get away with up to 30m2 if other conditions are also met). The eaves height must be below 2.5m for a flat roof, 4m for a pitched roof, or 3m for anything else.
One story detached accessory structures used as a tool or storage shed, playhouses and similar uses, provided the floor area does not exceed 120 square feet. Fences not over seven (7) feet high (Approval may be required from the Planning Division for fences located in the front yard setback)
Storage sheds less than 120 square feet in area do not require a building permit.
Typically, planning consent is not necessary for a shed or outbuilding, if its proposed floor area is below 15 square metres, it does not include sleeping accommodations, and the whole structure does not exceed a height of 2.5 metres (if it is located within 2 metres of the property boundary).
Per the California Residential Code detached accessory structure not exceeding 120 square feet does not require a building permit if there is no plumbing, electrical, and or mechanical equipment.
Projects that change the configuration of walls, pipes, wiring, roofs, or major appliances typically DO require at least one type of building permit. Projects that DO NOT need a building permit are simple surface (cosmetic) projects; minor repairs and replacements; and minor site improvements or small structures.