These are the saunas where the cold plunge is part of the design, not an afterthought. On-site tubs, troughs, or dip pools mean the hot–cold–rest cycle is available every session without planning the open-water swim yourself. Plan 90 minutes minimum to run the cycle properly rather than rushing a single long sit.
In London, 5 of the curated saunas fit this cut. See the full London guide for every venue in the city, or keep scrolling for just the sauna with a cold plunges.
