Tenderloin Bathhouse Near Me: Onsen's Former Auto-Shop Soaking Pool on Eddy

Onsen charges $50 for a two-hour soak at 466 Eddy Street, and that price already includes a robe, towel and sandals. The Tenderloin bathhouse opened in 2016 inside a converted auto-body shop, closed during the 2020 shutdowns, and reopened in April 2025 under Adam Wren, its former general manager. For anyone searching bathhouse near me from Union Square or Civic Center, it is the closest communal soak, a 104-degree tub, a redwood sauna, a steam room and an overhead cold plunge, about ten minutes on foot from Powell Street.

The building explains the layout. When Onsen opened, its owners turned the old mechanics' pit of the auto-body shop into the heated pool, so you step down into the water roughly where cars were once worked on from below. The San Francisco Standard's reopening report put the rebuilt pool at 15 people, and the bathhouse lists it as four feet deep.

Inside, the space is intimate rather than grand. The amenity list is short: the communal tub, a redwood dry sauna, a steam room, a custom cold plunge that pours from overhead, and Western-style showers. What makes it feel different from a gym spa is the warm lighting, the hot tea included with every visit and the sense of a neighborhood sento hidden behind an unassuming Eddy Street door.

The house philosophy is unusual among San Francisco bathhouses. Wren told the Standard that unlike many traditional bathhouses, Onsen does not enforce silence, and the FAQ says guests are encouraged to talk with friends and fellow bathers as long as voices stay calm and soft. Weekends tend to be busier and more social, while the single-gender sessions run quieter.

That makes Onsen the right pick for two or three friends who want to catch up between sauna rounds. If you want total silence, this is the wrong room. The phone rule still applies, though: cell phones, photos and filming are not allowed anywhere in the communal bath.

Onsen keeps a narrow schedule. Monday runs 4 pm to 10 pm for men, with bathing suits optional, and Wednesday runs the same hours for women, also suit-optional. Thursday opens at 2 pm and runs until 10 pm as a co-ed session with suits required. Friday, Saturday and Sunday are co-ed all day, 10 am to 10 pm, swimsuits required.

Tuesday is the dark day, so plan around it. Forgot your swimsuit on a co-ed day? The front desk sells them. Guests must be 18 or older, and pregnant visitors are asked to check with a physician first. Outside food and drinks are not permitted in the bathing area.

Reservations go through Tock and cap each booking at four guests. The bathhouse warns that groups trying to get around that limit with split bookings may have reservations cancelled, so parties of five or more should ask about a private soak instead. Cancellations inside 24 hours, and no-shows, are not refunded.

Walk-ins are accepted when there is space, but weekend afternoons are the hardest to get. A weekday Thursday at 2 pm, right as the co-ed session opens, is the easiest window. Arrive at least five minutes early to fill in the intake form, then shower before you step into the steam room, sauna or tub.

The best reason to choose Onsen over a bigger bathhouse is the restaurant. Dinner runs Thursday through Sunday as a structured, multi-course menu that the bathhouse calls Japanese inspired and California driven, with sake, beer and tea. Two timed pairings are offered: bathe at 4 pm and eat at 6 pm, or bathe at 6 pm and eat at 8 pm.

Dinner can also be booked on its own between 5:30 pm and 8 pm. Seating is limited to a few tables and a chef's counter, and no party larger than four is accepted. The kitchen handles vegetarian, pescatarian, soy-free, gluten-free and dairy-free requests if you send them at least 36 hours ahead.

For birthdays and team outings, Onsen rents the entire space. A two-hour private soak for up to 15 people runs $900 to $1,000, and private groups can put a film on the overhead projector next to the pool or plug in their own playlist. Exclusive bookings are also the only time photos are allowed and swimsuits become your group's choice.

Larger buyouts exist for four and six hours, up to 40 guests. For most visitors, though, the communal sessions are the point, the mix of regulars, first-timers and couples sharing one hot tub in a former garage.

Onsen sits on the 400 block of Eddy between Hyde and Leavenworth. Street parking is scarce, and the bathhouse points to the garage across the street at 469 Eddy, which it says charges $15 to $20. A rideshare or the walk from Civic Center or Powell Street BART is simpler, and after dark a car home is the sensible choice in this part of the Tenderloin.

Before your soak, walk two blocks to the Tenderloin Museum at Eddy and Leavenworth, which tells the neighborhood's history from vaudeville to the Compton's Cafeteria riot. Afterward, Little Saigon's pho shops along Larkin Street are a short stroll west for anyone not staying for dinner.

An honest note: the room is small, and on a busy Saturday the tub can feel crowded. If the calendar is full, Kabuki Springs & Spa in Japantown offers a quieter, silence-first communal bath, and Archimedes Banya in Hunters Point has far more space spread across several floors. A Monday or Wednesday evening session is also the calmer way to try Onsen itself, since the single-gender hours are quieter than the weekend co-ed crowd.

Onsen, 466 Eddy Street, San Francisco, CA 94109. Bath: $50 for two hours, robe, towel and sandals included, maximum four guests per reservation. Hours: Monday men 4 pm to 10 pm, Wednesday women 4 pm to 10 pm, Thursday co-ed 2 pm to 10 pm, Friday to Sunday co-ed 10 am to 10 pm, closed Tuesday. Ages 18 and up. Ask Karpo in the Karpo APP to plan a bath-and-dinner night.