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A basic plug-in infrared unit may not need a permit, but the rules change if you’re adding new wiring, plumbing, or ventilation. Any time the project touches your home’s electrical or plumbing system, plan on pulling a permit and scheduling inspections. Check with your local building department first so your new sauna meets code and stays safe.

Most homeowners tuck an outdoor sauna near the pool, deck, or a quiet corner of the yard where ventilation is easy. Indoor spots work, too—think basement, large bathroom, or even a walk-in closet—as long as the space can handle heat and moisture and a pro signs off on ventilation and electrical needs.