Top 100 Negative vs Top 100 Positive — Bigger Properties Generate More Comments, and at 700+ Rooms the Rate Gap Doubles

Start by comparing who is on the two lists. The 100 properties on the negative side have a median of 319 rooms (interquartile range 227–550), and 30 of them have 400+ rooms. The positive side is a size smaller: median 231 rooms (interquartile range 160–369), with 20 properties at 400+ rooms. By segment, the negative side has 58 business hotels, 20 resort hotels, 14 city hotels and 7 ryokan; the positive side has 43 business hotels, 26 resort hotels, 25 ryokan and 6 city hotels. The high number of ryokan on the positive side stands out. Geographically, the negative side leans toward big cities plus Sapporo and Sendai: Hokkaido 14, Osaka 11, Tokyo 8, Kanagawa 6, Kyoto 6 and Miyagi 6. The positive side is more spread out and includes onsen destinations: Kanagawa, Osaka, Shizuoka and Tokyo with 8 each, Hokkaido 7 and Nara 6.

The impression that bigger properties draw more complaints is partly a product of how the lists were built, however. Each top-100 list is ranked by number of mentions, so large properties with many reviews get onto both lists more easily. In fact 36 properties appear on both lists at once, and their median room count of 369 is larger than either list as a whole. The relationship between property size and crowding should therefore be read through the mention rate (mentions ÷ total reviews), not the count.

Lining up mention rates by size band makes the picture clear. On the negative side the median mention rate is 4.29% under 100 rooms (N=4), 2.33% at 100–199 rooms (N=11), 1.97% at 200–399 rooms (N=55), 2.12% at 400–699 rooms (N=15) and 2.02% at 700+ rooms (N=15): it holds at around 2% and does not fall as properties grow. On the positive side it is 2.24% under 100 rooms (N=12), 1.84% at 100–199 rooms (N=25), 1.18% at 200–399 rooms (N=43), 0.99% at 400–699 rooms (N=8) and 0.92% at 700+ rooms (N=12): the bigger the property, the less often guests write that the bath was quiet. At 700+ rooms, the negative rate (2.02%) is 2.2 times the positive rate (0.92%). Even when a large property's total bath area is big, its capacity relative to the number of guests seems hard to keep up.

By segment, the median negative mention rate is 2.07% for business hotels (N=58), 1.71% for city hotels (N=14) and 2.13% for resort hotels (N=20), but 3.85% for ryokan (N=7). On the positive side, ryokan are also relatively high at 1.80% (N=25). At a ryokan almost every guest uses the communal bath, and bathing is concentrated in a short window before and after dinner, so whether the bath is crowded or quiet, it tends to end up in reviews as a story about the bath. Ryokan are the segment where capacity design shows up most directly in reviews.

On the map, negative mentions cluster in Osaka (921), Hokkaido (645), Kanagawa (572) and Tokyo (495). Positive mentions are led by Kanagawa (325), Osaka (283), Tokyo (243), Shizuoka (239) and Hokkaido (202), with depth in onsen prefectures such as Shizuoka (Atami, Izu) and Nara (186). Large big-city properties simply host many guests, including inbound visitors, so bathing times are hard to spread out. Onsen ryokan have several baths and longer stays, which makes it easier for bathing times to disperse. That difference shows up in the geographic distribution.

9–13 Wash Stations per 100 Rooms — A Capacity Benchmark Back-Calculated from the Public Bathhouse Hygiene Guidelines

So how many wash stations and how much floor area does it take for guests not to write that the bath was crowded? There is no standard setting wash stations per room for hotel and ryokan baths, but public bathhouses have a design benchmark based on the Ministry of Health, Labour and Welfare's Guidelines for Hygiene Management in Public Bathhouses. The washing area should preferably be at least "maximum hourly bath users × 20 min / 60 min × 1.1 m² × 1.5," where 1.1 m² is the washing area used per bather, 1.5 is a factor for aisles and the like, and 20 minutes is the time spent at the washing area (the same formula appears in review-standard documents published by Shobara City and Fukuyama City in Hiroshima Prefecture). The number of taps is to match the maximum number of users, and Tokushima Prefecture's list of structural and equipment standards sets tap spacing at "roughly 70 cm or more, preferably 90 cm or more."

Applied to lodging, the required number of wash stations can be approximated as "people arriving at the bath in the peak hour × 20/60." Assuming 2 guests per room, 80% occupancy (a full-year assumption), 70% of guests bathing, an even male/female split, and bathing concentrated in a 3-hour evening window with 35% arriving in the peak hour, the required stations come to about 6.5% of the room count (for each of the men's and women's baths). For 300 rooms that is 20 stations each, 40 in total, and at 1.65 m² per station (1.1 m² × 1.5), a washing area of 33 m² for each bath.

The estimate moves a lot with its assumptions. Comparing three scenarios that vary occupancy, bathing rate and peak concentration, the wash stations required per 100 rooms (both baths) are 7.0 in the optimistic case, 13.1 in the middle case and 19.2 in the pessimistic case, roughly a threefold range. The published example of 9.5 stations (a 419-room onsen hotel) sits between the optimistic and middle cases, and this article's band of 9–13 runs from the level of properties where time dispersion works to the level under this article's assumptions. The pessimistic case (high occupancy in peak season, bathing concentrated after dinner) needs around 19 per 100 rooms, so properties near the bottom of the band are likely to hear more "it was crowded" in peak season.

On two axes, the required stations range from 5.6 at 60% occupancy (full-year assumption) and 20% concentration to 17.7 at 95% occupancy and 40% concentration. Within the range examined, the swing from peak concentration (2x from 20% to 40%) is larger than the swing from occupancy (1.6x from 60% to 95%): simply lowering concentration from 35% to 25% cuts the required stations for a property at 80% occupancy (full-year assumption) from 13.1 to 9.3. The table shows that measures which spread bathing times, such as congestion displays or rotating the men's and women's baths, work in the same direction as adding stations.

Against published figures, the estimate comes out on the generous side. A large onsen hotel in Sapporo (419 rooms) is listed on a booking site with 24 wash booths in the men's bath and 16 in the women's, 40 in total, or 9.5 per 100 rooms. Dai-ichi Takimotokan (第一滝本館) in Noboribetsu Onsen (385 rooms) says its 1,500-tsubo (about 5,000 m²) bathing complex has 35 baths for men and women combined, a design that secures capacity through the number and area of baths rather than wash stations. At properties with 24-hour bathing, bathing times disperse and peak-hour concentration falls below this article's assumption (35%), so the required number of stations is below the estimate. As a practical benchmark, 9–13 wash stations per 100 rooms (both baths), or 15–22 m² of washing area per 100 rooms, appears to be the capacity band that keeps crowding complaints down. Properties below it are candidates for operational measures that spread bathing times, or for adding stations.

Three Types of Congestion Relief and Their Capex — Displays ¥2 per Room-Night, 10 More Wash Stations ¥17–23, a 50 m² Extension ¥53–70

Congestion countermeasures fall into three types: operational (shifting timing without adding equipment), display (showing guests how crowded the bath is) and facility (adding stations and floor area). Each was applied to a 300-room model property (80% occupancy as a full-year assumption, 87,600 room-nights a year) and converted into Capex per room and per room-night. Facility unit costs are estimates based on the 2025 RC-construction cost of ¥2.026M per tsubo (about ¥610k per m²) from the Ministry of Land, Infrastructure, Transport and Tourism's Statistics on Building Construction Starts, assuming bath areas cost 1.5–2.0 times more than general areas because of waterproofing, plumbing and tiling (¥920k–¥1.23M per m²). They exclude the cost of upgrading hot-water capacity and the impact on operations during construction. Upgrade costs for existing bath equipment such as circulation filtration are analyzed in detail in our analysis of onsen ryokan bath Capex, and lost revenue during renovation in our estimate of hotel renovation downtime costs.

Converted and lined up, the three types differ by orders of magnitude. The display example at its published price comes to about ¥6,200 per room over 10 years, or about ¥2 per room-night, which is 0.02% of revenue even for a property with an ADR in the low ¥10,000s. Adding 10 wash stations costs ¥17–23 per room-night and a 50 m² extension ¥53–70, equivalent to 0.1–0.5% of an ADR of ¥13,900 (the median estimated settled ADR of the 100 positive-side properties). The impact on rates is small in every case. Weighing the effect on guests' perception against cost, the rational order is to spread bathing times first with displays and operations, and to consider facility measures only in the size bands where that is not enough (700+ rooms in this article's analysis).

Facility unit costs should also factor in rising construction costs. Construction consultancy Turner & Townsend expects construction costs in 2026 to rise 6% in Tokyo and Fukuoka, 5.9% in Osaka and 6.2% in Hiroshima, so a project starting in 2027 would need to add around 6% to the estimates above. The upper end of a 50 m² extension then approaches about ¥65M. Rising construction costs also restrain new supply, which raises the relative value of investments that let existing properties differentiate on bath capacity.

The Opportunity Cost of Not Converting Bath Space to Rooms — 50 m² Equals Two Rooms and ¥8.1M in Annual Revenue

Behind any decision to extend or keep a bath lies an opportunity cost: how much the same floor area would earn as guest rooms. With a 70% share of space going to the rooms themselves, 50 m² of bath area is equivalent to about two 18 m² rooms. At the median estimated settled ADR of ¥13,900 for the 100 positive-side properties and 80% occupancy (full-year assumption), one room earns about ¥4.06M a year and two rooms about ¥8.1M. Assuming a GOP margin of 40–60%, that is an additional ¥3.2M–¥4.9M in annual GOP.

The comparison can be restated as "deciding to keep the bath is the same as deciding to give up 0.7% of revenue every year." Put the other way, if bath capacity lifts rate or occupancy by 0.7% or more through guest ratings, keeping the bath is more rational than converting it to rooms. In this article's data, properties with an estimated settled ADR of ¥20k–30k have the lowest median negative mention rate of any band at 1.40% (N=16), and their positive rate of 1.59% (N=22) is the only one of any band that exceeds the negative rate. This is circumstantial evidence that bath capacity ties more closely to ratings as the price band rises, and that the decision not to give up bath space is easier to justify the higher a property's rate band.

Hotel Urashima (ホテル浦島) in Nachikatsuura, Wakayama Prefecture (4 buildings, 365 rooms) is investing about ¥4B in a renovation announced in August 2026. By putting beds into Japanese-style rooms it is cutting the capacity of the affected rooms by 24%, while stating its aim to "raise both occupancy and rate, and lift RevPAR." Reducing guest capacity to increase in-house space per guest also works to raise the relative capacity of the bath (for moves to reduce room counts and rethink in-house capacity, see also our analysis of downsizing at a 200+ room onsen hotel). Kamenoi Hotels, operated by MyStays Hotel Management, announced the renovation of 12 properties from March 2025, including bath upgrades at Atami, Aomori Makado, Kamogawa, Awajishima and Aso (investment not disclosed). Investment that "renews capacity" rather than merely "maintaining" the bath is becoming a wider option for existing properties.

Mention Rates by ADR Band and the Rate Position of Positive-Side Properties — Price Positioning Does Not Explain Crowding Ratings

Finally, we check whether crowding ratings relate to the price band or to rate position within the local market. By band of estimated settled ADR (each property's median for November 2025 to October 2026), the median negative mention rate is 2.68% under ¥10k (N=19), 2.19% at ¥10k–15k (N=46), 2.04% at ¥15k–20k (N=17) and 1.40% at ¥20k–30k (N=16): the higher the rate, the lower the negative rate. The positive side is 1.18% under ¥10k (N=15), 1.33% at ¥10k–15k (N=38), 1.32% at ¥15k–20k (N=18), 1.59% at ¥20k–30k (N=22) and 1.72% at ¥30k+ (N=7): the higher the rate, the higher the positive rate. Properties in higher price bands have more bath capacity relative to their guest count and are more likely to be described as quiet.

On the other hand, "rate position", each property's rate compared with the median of its city, showed no difference between the two sides. The ratio of September 2026 estimated settled ADR to the same-month city median is a median of 1.10 on the negative side (interquartile range 0.95–1.44, N=96) and 1.09 on the positive side (interquartile range 0.94–1.44, N=97), almost identical, and the shares of properties above the city median are similar at 61% and 58%. In other words, there is no sign that "expensive properties for their area are quiet" or "cheap ones are crowded." What separates crowding ratings is not price positioning but bath capacity relative to the guest count, and operations that spread bathing times.

Guest comments at the named properties reveal combinations of capacity and operations. At Gensen-yu no Yado Sennotani (110 rooms, 72 positive mentions) guests praise multiple baths: "we relaxed without feeling crowded…", "two baths, on the 1st and 3rd floors…". At Gero Onsen Suimeikan (264 rooms, 70 positive mentions) guests mention both the three baths and the display: "there are three baths, and you can check how busy they are online…". Tenseien (198 rooms, 45 positive mentions), with "the bath is really spacious and never crowded…", and Asaya Hotel (192 rooms, 47 positive mentions), with "quiet for such a big hotel…", follow the model of absorbing guests with space. Arima Gyoen (65 rooms, 35 positive mentions), with "being able to see how crowded the bath is on the room TV…", and Kutsurogi-yado Shintaki (81 rooms, 30 positive mentions), with "there are three baths and it never got crowded…", show that even small ryokan can collect "it was quiet" comments through dispersion and displays. Hotel New Shiobara (271 rooms, 32 positive mentions), with "despite the many guests, we could get in at times when it was not very crowded…", is an example of guests' own choice of timing at work. All quotes are excerpts from guest comments posted between November 2024 and October 2026.

Summary — Measure Capacity as Stations per 100 Rooms, and Invest Step by Step from Displays to Facilities

To sum up, reviews about bath crowding total 5,882 for the top 100 negative properties, 1.81 times the 3,257 for the top 100 positive properties, and the negative side leans toward large properties with a median of 319 rooms. By size band, the mention-rate gap widens at 700+ rooms to 2.02% negative vs 0.92% positive, and by segment ryokan are the most likely to have their baths written about, at 3.85% negative and 1.80% positive. Price positioning (the ratio to the city median) shows no difference between the two sides at 1.10 and 1.09: what separates crowding ratings is capacity and operations.

The capacity benchmark is 9–13 wash stations and 15–22 m² of washing area per 100 rooms, which sits between the formula in the public bathhouse hygiene guidelines and published examples. Capex for the countermeasures differs by orders of magnitude, about ¥2 per room-night for the display example at its published price, ¥17–23 for 10 extra wash stations and ¥53–70 for a 50 m² extension, so the logical order is to encourage dispersion first through displays, rotation and time guidance, and move to facility measures only in the size bands where that is not enough. Keeping 50 m² of bath space carries an opportunity cost equal to two rooms and about ¥8.1M in annual revenue (0.7% of revenue), but in the ¥20k+ rate bands the positive rate exceeds the negative rate, and the decision becomes more rational the more closely bath capacity ties to a property's ratings. For properties that already have a large communal bath, renewing capacity is a differentiating investment that only existing properties can make, at a time when construction costs make new entry harder.