Cold plunge wiring in Portland costs $250–$3,800 in 2026 depending on plug-in vs hardwired and indoor vs outdoor. Cold plunges fall under NEC Article 680 (water-immersion rules) — not Article 422 like saunas — meaning equipotential bonding, listed disconnects, and source-side GFCI are mandatory. Licensed install with same-week scheduling for most plug-in jobs.

Hardwiring a residential sauna in Portland costs $500–$2,500 in 2026, depending on indoor vs outdoor and panel distance. Older homes may need a 200A upgrade first. Most contractors get the code wrong by citing NEC 680 (hot tubs) — saunas are governed by NEC 422. Full breakdown of cost scenarios, wire sizing, GFCI rules, and 2026 county permit fees.