How to book a kashikiri bath: step by step
Booking a private bath is easy once you know which system your inn uses. This practical guide takes you from choosing a ryokan to locking the door, with an email template and the Japanese phrases you need at the front desk. For background on what kashikiri baths are, see how kashikiri private baths work.
How do you book a kashikiri bath?
It depends on the ryokan. Some take reservations for a time slot at booking or check-in, some let you reserve only on arrival, and others are first come, first served: if the door is open, go in and lock it. Check the booking rule on the property page and ask at check-in.
Updated · How we verify · Open data
Step 1: Choose an inn with the right private baths
Start with the property facts. On our listings you can see whether an inn has private baths, how many, whether they are free, and whether booking is in advance, at check-in or first-come. An inn with several private baths makes everything easier, and a free bath means no extra fee.
Private baths in our verified data
Of the 219 properties we have verified, 188 have private kashikiri baths. 32 say they are free for guests and 39 charge a fee, with stated fees from ¥1,000 to ¥5,500 per use. For booking, 36 take advance reservations, 10 book at check-in and 20 are first-come; the rest don't say. Towns with the most free private baths: Kinosaki (11), Kusatsu (5), West Izu (3), Atami (2) and Shuzenji (2).
| In our verified data | Properties | Examples |
|---|---|---|
| Private kashikiri baths | 188 | Hakone Kowaki Sono Tenyu, La Vista Kusatsu Hills and Odakyu Hotel Hatsuhana |
| Free for guests | 32 | La Vista Kusatsu Hills, Hotel New Ohruri and Kikuya |
| Paid | 39 | Gekko Sono Yu Gassanso, Hotel New Sagami-ya and Koro-kan |
| Advance reservation | 36 | Hakone Kowaki Sono Tenyu, Odakyu Hotel Hatsuhana and Umi no Hotel Isaba |
| Book at check-in | 10 | Mikuniya, Naraya and Nogamihonkan Ryokan |
| First come, first served | 20 | Azumaya, La Vista Fujikawaguchiko and Hotel New Sagami-ya |
| Most private baths | 3 | Onsen Tenseien (12), Hakone Kowaki Sono Tenyu (8) and Gero Onsen Yamagataya (7) |
Counts from each property's official website, last checked 18 October 2026.
Step 2: Check the booking system
| If the website says | It usually means | Your move |
|---|---|---|
| 要予約 / 予約制 | Reservation required | Book a slot when you reserve the room or by email. |
| チェックイン時に予約 | Reserve at check-in | Arrive early and ask at the desk. |
| 空いていればご利用可 / 先着順 | Use when free / first come | Check the sign on the door and lock it from inside. |
| 有料 / 1回 ○○円 | Paid, per use | Ask if payment is at the desk or on the bill. |
| 無料 | Free | Still check how booking works. |
Step 3: Book the room and request a slot
If the inn takes advance reservations, add your preferred time in the booking site's special-requests box, then follow up with a short email to the inn. Requests in the booking box are not always passed on in detail, so a direct email is worth it for important stays.
Email template
Subject: Private bath reservation, [arrival date], [your name]. Hello, I have a reservation for [number] guests on [date] (booking number [number]). We would like to reserve the private bath (kashikiri-buro). If possible, we would prefer [time], or [second choice]. Please let us know if there is a fee and how to pay. Thank you very much, [name].
If you have tattoos or children, mention them in the same email so the inn can tell you about any rules.
Step 4: At check-in
Even with a reservation, confirm your slot at the desk. If the inn books at check-in, ask straight away: the best evening times go first. Staff will usually show you a sheet with the times and a map of the baths.
Japanese phrases for the front desk
| English | Japanese | Reading |
|---|---|---|
| I would like to reserve the private bath. | 貸切風呂を予約したいです。 | kashikiri-buro o yoyaku shitai desu |
| Is it free now? | 今、空いていますか？ | ima, aite imasu ka |
| What times are available? | 何時が空いていますか？ | nanji ga aite imasu ka |
| Is there a fee? | 料金はかかりますか？ | ryōkin wa kakarimasu ka |
| How long can we use it? | 何分使えますか？ | nanpun tsukaemasu ka |
| Thank you. | ありがとうございます。 | arigatō gozaimasu |
Step 5: Choosing the best time slot
- Before dinner (about 4 to 5:30 pm): popular, good light in open-air baths.
- Straight after dinner: the busiest time at first-come inns.
- Late evening (after 9 pm): quieter, lovely in winter and under the stars.
- Early morning (6 to 7:30 am): often the quietest and freshest slot.
Leave at least 15 minutes between your slot and dinner. If you plan two soaks, book one in the evening and one in the morning.
Step 6: Using the bath
- Bring your towels, room key and any toiletries; wear the inn's yukata and slippers.
- Check the sign or lamp: 空き means free, 使用中 means in use.
- Turn the sign to in use, go in and lock the door.
- Wash and rinse before entering the water; keep towels out of the tub.
- Leave on time, tidy the basins and stools, turn the sign back and unlock the door.
First-come baths: how to get in without waiting
With first-come baths, the door sign is everything. Walk past at a quiet time, check several baths if the inn has more than one, and don't knock on an occupied bath. If an inn has a single private bath and many guests, try during dinner service or early morning.
Booking a kashikiri bath through booking sites
International booking sites rarely let you choose a private-bath slot directly. Some show the private bath as a facility, others don't mention it at all. Use the special-requests box to say you would like to reserve the private bath and your preferred time, and expect the inn to confirm on arrival. Japanese booking sites and the inn's own website sometimes sell plans that include a reserved private bath; those are the most reliable way to guarantee a slot.
Plans that include a private bath
Look for plan names with 貸切風呂付 (with private bath) or 貸切風呂無料 (private bath free). Such plans may cost more than a room-only rate, but they lock in the slot. Read what is included: one slot or unlimited use, and whether the slot time is fixed.
Private baths at inns with only one bath
If a small inn has a single private bath, each room may only get one slot, or the bath may be first-come for the whole evening. Ask at check-in how it works and choose a quieter time. If the private bath is the main reason for your stay, an inn with three or more baths is a safer bet. Our listings show the number of private baths where the website states it.
Kashikiri booking checklist
- Inn has private baths, and you know the number.
- You know whether they are free or paid.
- You know whether booking is in advance, at check-in or first-come.
- Email sent with preferred times, if advance booking is possible.
- Dinner time chosen with a buffer around your slot.
- Tattoo or child questions asked and answered in writing.
Paying for a private bath
Paid private baths are usually charged to your room and settled at check-out, though some inns ask for payment at the desk when you book the slot. Ask whether the fee is per slot or per person. If the website states a large amount, it may be the price of a plan that includes the bath rather than a per-use fee.
Kashikiri baths for day visitors
If you are not staying overnight, look for day-use private baths instead, which are sold to visitors by the slot. Booking rules are similar: some take reservations, others hand out slots at reception. See day-use private onsen for places in our data.
What if something goes wrong?
- Your slot is taken: politely show your confirmation email at the desk.
- You're late from sightseeing: call the inn; they may move your slot.
- The bath is too hot: add cold water if allowed, or keep soaks short.
- You need more time: ask at the desk whether the next slot is free.
Ready to choose? Browse ryokan with free private baths in Kinosaki, in Kusatsu, Hakone ryokan for couples or day-use private onsen.
Related guides
Find a private onsen
Frequently asked questions
How do I book a private onsen bath at a ryokan?
Check the inn's system: book in advance, at check-in, or use it first-come. Email the inn with your preferred time if advance booking is possible.
Can I reserve a kashikiri bath online?
Sometimes through the inn's own website or a special request on a booking site; following up by email helps.
What is the best time to use a private bath?
Late evening and early morning are usually quietest.
How do I say 'I'd like to reserve the private bath' in Japanese?
貸切風呂を予約したいです (kashikiri-buro o yoyaku shitai desu).
What does 使用中 mean on the door?
In use. 空き means free.
Can I use the private bath twice?
Often, if slots are free; some inns limit bookings to one per room.