Detached accessory structures used as tool and storage sheds, playhouses or similar uses, provided the floor area does not exceed 256 square feet and is not more than one story, (under 18” floor height, under 10' eave height above grade.)
Permits are typically required for the following projects: alterations to existing commercial structures; commercial structures; carport enclosures; decks; demolition; electrical systems; finished basements; garages and sheds; HVAC systems; mobile homes; plumbing systems; pools, spas and hot tubs; renovations; ...
Structures over 256 square feet in size require a building permit. Also, most plumbing or electrical lines that are run to a structure require trade permits.
Permits are required for the construction of a new building, shed, deck, additions, or renovations to existing structures.
On a single-family house, most routine work does not require a permit. You can: Paint, add or replace carpet, tile or hardwood floors, replace cabinets, and even replace paneling and drywall without a permit. Replace your windows and doors, as long as you don't change the size of the opening in the wall.
Compliance with a notice of violation notwithstanding, the building official may request legal proceedings be instituted for prosecution when a person, firm or corporation is served with three or more notices of violation within one calendar year for failure to obtain a required construction permit prior to ...
The quick and simple answer is: you usually don't need a permit if the shed is 120 square feet or less. In California, most jurisdictions have adopted the 120 square foot rule. If your shed area is larger than 120 square feet, it needs a building permit. If it's less than that, it doesn't.