Whatcom County, WA Swimming Pools & Spas: Pool Permits (2026)

The exemption in WCC § 15.04.030(C), amending IRC § R105.2 (Work Exempt from Permit), is narrow and cumulative: a pool loses the exemption if it sits on a deck or platform, if a deck or platform is built within 6 feet of it, if it holds 5,000 gallons or more, if it is 24 inches deep or deeper, or if it serves anything other than a single-family residence. Any pool that fails even one of those four conditions, meaning essentially every in-ground pool and most larger above-ground pools and permanently plumbed hot tubs, must be installed per the 2021 International Swimming Pool and Spa Code (ISPSC), which Whatcom County adopts as part of the IBC under WCC § 15.04.010(A).

To get that permit, the owner or contractor files a written application with the Planning and Development Services Building Official, pays the fee set in the unified fee schedule, and cannot start construction until the Building Official issues written notice of a valid permit (IBC §§ 105.1.7-.8, amended by WCC § 15.04.020(C)(1)). A pool permit, like other building permits, expires two years after issuance under WCC § 15.04.050(A) unless the owner applies in writing for a single one-year extension, and a 60-day extension is available if only the final inspection remains.

Grading or fill associated with an in-ground pool that disturbs land near the Lake Whatcom watershed overlay or a water resource protection overlay district can also trigger a separate land-disturbance permit tied to the same expiration schedule.