EliteVerified listingThe Mayfair Bathing Rooms
Mayfair, London
Hotel spa with a 20-metre pool, thermal suite and eight treatment rooms
4.7 · 3 reviews
Traditional dry heat at 70 to 100°C, from spa suites to social saunas
A traditional Finnish sauna is a wood-lined room heated to between 70 and 100°C with low humidity, where water ladled onto hot stones produces bursts of steam known as löyly. The usual rhythm is a session of 10 to 15 minutes, a cool-down in a shower or plunge pool, a rest, and two or three rounds in total. Regular sauna bathing is associated in Finnish studies with better cardiovascular health and many people find it helps them sleep and unwind.
In the UK, saunas come in two very different settings. Spas and gyms include one in the thermal suite, often alongside a steam room. The fast-growing social sauna movement — on beaches, riverbanks and harbours from Brighton to Edinburgh — runs larger saunas with timed sessions, cold plunges or sea dips and a communal atmosphere, sometimes with Aufguss ceremonies where a sauna master circulates aromatic heat with a towel.
A social sauna session of 60 to 90 minutes typically costs £12 to £25, with memberships and off-peak rates lower. Avoid sauna after alcohol, during a fever or in pregnancy unless your doctor agrees, and speak to your GP first if you have heart problems or uncontrolled blood pressure. Drink water before and after.
Also known as: Finnish sauna, social sauna, sauna session.
EliteVerified listingMayfair, London
Hotel spa with a 20-metre pool, thermal suite and eight treatment rooms
4.7 · 3 reviews
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Social sauna and cold plunges in two railway arches, open until 10pm
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Community sauna and cold plunges in a converted workshop
Social and community saunas usually charge £12 to £25 for 60 to 90 minutes, with private hire for a group from around £100 an hour. In spas the sauna is normally included in a facilities pass or spa day.
Ten to fifteen minutes per round is plenty, followed by a cool-down and a rest, and two or three rounds in total. Leave sooner if you feel dizzy or uncomfortable; there is no benefit in pushing through.
Swimwear is standard in UK spas and social saunas. Some venues run textile-free sessions, as is the norm in Germany and Scandinavia, but they always say so clearly. Sit on a towel for hygiene.
Ten common reasons for booking and the kind of centre that fits each one, so the day you book is the day you wanted.
The habits that make heat and cold a pleasure rather than a risk, and the warning signs to leave on.
How a spa day actually runs, from the health form at reception to the last swim before you leave.