Building Safety in Island County, WA (2026)
2 rules for unincorporated Island County, Washington.
Verified from official government sources
Building Permits
In unincorporated Island County, most new construction needs a building permit reviewed against the adopted International Building and Residential Codes. Section 14.01A.040 carves out one exception: a Group-U accessory structure tied to a private residence or agricultural use skips the permit, fee and inspection entirely, unless its materials are worth more than $1,000, in which case a smaller alternative permit applies.
Island County Building Permit Requirement
Some RestrictionsIsland County Code § 14.01A.040
A.No permit, fee, or inspection pursuant to the International Building Code shall be required for constructing a Group-U occupancy structure, as defined in the International Building Code, when it is accessory to a private residence or to be used for agricultural purposes, except as provided in subsection B. below.B.If the value of material for a Group-U occupancy structure which has been excep...
Plumbing Permits
Plumbing work in unincorporated Island County is permitted and inspected under the Uniform Plumbing Code, not a locally written plumbing code. Section 14.01A.010(A)(1)(e) adopts the Uniform Plumbing Code and Uniform Plumbing Code Standards by reference, while specifically declining to adopt any of that code's provisions covering sewers or fuel gas piping, which the county regulates elsewhere.
Island County Adopted Plumbing Code
Some RestrictionsIsland County Code § 14.01A.010(A)(1)(e)
e.Except as provided in RCW 19.27.170, the Uniform Plumbing Code and Uniform Plumbing Code Standards, published by the International Association of Plumbing and Mechanical Officials: Provided, that any provisions of such code affecting sewers or fuel gas piping are not adopted.
All Island County ordinances
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