The biggest sized shed you can build in Washington state without a permit is one with a roof square footage of 120 square feet, no taller than one story.
A Clearing Permit is required for any removal of trees or vegetation from a critical area or from properties subject to urban clearing standards or clearing restrictions in a special district overlay defined in 21A. 38 of the King County Code.
A building permit shall not be required for the following: One-story detached accessory buildings used as tool and storage sheds, playhouses and similar uses, provided the projected roof area does not exceed one hundred twenty square feet. Fences not over six feet high. Oil derricks.
A permit is typically required for sheds larger than 200 square feet.
A building permit shall not be required for the following: One-story detached accessory buildings used as tool and storage sheds, playhouses and similar uses, provided the projected roof area does not exceed one hundred twenty square feet. Fences not over six feet high. Oil derricks.
Most new construction, remodeling, and repair work that affect a building or structure will require a permit.
SIZE RESTRAINTS IN WA So a good start is knowing how big does your building need to be before it is required to have paper work submitted and council approval. In Western Australia the common regulation is 10 square metres. Anything larger than 10 sqm may require a permit and if it's under 10 sqm, you may not need one.
Since failure to obtain a permit is a violation of City ordinances and state law, fines may be levied. The work may be required to be torn out and redone, or removed completely, either because the work was not done to code, or the work cannot be approved due to building or zoning requirements.
The biggest sized shed you can build in Washington state without a permit is one with a roof square footage of 120 square feet, no taller than one story.