You don't need a permit to build a shed if it meets all of these criteria: The total area (or “footprint”) of the shed's roof is 120 square feet or less. The shed is a single-story building. The shed sits on a simple concrete slab, pier blocks, or soil.
In unincorporated King County, fences up to 6 feet in height may be built on or within property lines without a permit. Fences over 6 feet in height require a permit and must meet the required setbacks for the zoning of the parcel (for zoning information, see section 21A.
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.
Andrew Quattrociocchi - Chief Building Official - Township of King | LinkedIn.
You will need a permit to build a shed in Washington if the projected roof area is over 120 square feet, it is more than one story, it's attached to a house or other building, or it is near an environmentally critical area (ECA).
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).
Any structure that is 200 square feet or less with or without a residence may be constructed without a permit as long as certain metrics are met. Structures that are built on the same land as a residence can be up to 800 square feet.
The International Building Code exempts certain structures from needing a building permit if they are less than 200 square feet and unconditioned space.
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Basically you can create a duchy building in the capital holding of the capital county of any duchy you control. Control means either you or one of your vassals holds the duchy title.