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.
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.
When is a building permit required? The International Building Code exempts certain structures from needing a building permit if they are less than 200 square feet and unconditioned space. Exempted structures do not require a building permit from the County but must comply with all King County code requirements.
Buildings under 10 m2 (107 sq. in area typically do not require a building permit, however, they must comply with the rules listed under where can you build? and what design rules do you need to meet?
If an inspector catches any unpermitted changes on their own, the consequences may be more severe. Your home could get “red-flagged” for a code violation, which may result in a hefty monthly fine until you resolve the issue.
Detached property extensions do not extend beyond the rear wall of the original home by more than 4m. The extensions roof & ridges must not exceed the height of the original house and the eaves must not exceed 2m in height of the boundary of 3m. Single-storey extensions must not exceed 4m in height.
A permit is typically required for sheds larger than 200 square feet.