A Building Permit is required for an owner or contractor of a property to construct any new building or structure greater than 120 square feet. Prior to starting construction you will be required to submit plans and any necessary supporting documentation for review and approval by the County.
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. Please note, Sheds and/or Structures under 120 square feet do require a Planning Permit.
Ing to the California Contractors State License Board, the new threshold to require a license will move up from $500 to $1,000. The change comes from a recently passed law, AB 2622.
The quick and simple answer is: you usually don't need a permit if the shed is 120 square feet or less.
Types of Projects That May Be Exempt From a Building Permit in California Painting. Floor upgrades. Kitchen remodels. Small drywall projects. Common electrical work. Small outbuildings. Bathroom fixes. Fences.
In California, you need a contractor license to do any work that costs more than $500. The easiest kind of contractor's license is a Class “B” Contractor's License. This license allows you to do general contracting work.