The Legal Minimum Is 7 m², or 9 m² With Beds — but the Cabinet Order Says Nothing About Capacity

Start with the exact wording. Article 1(1)(i) of the Enforcement Order of the Hotel Business Act (Cabinet Order No. 152 of 1957) requires, for ryokan/hotel business facilities, that “the floor area of one guest room shall be at least seven square meters (nine square meters for a guest room in which beds are placed).” Article 1(2)(i) provides for simple lodging that “the total floor area of guest rooms shall be at least thirty-three square meters (where the number of guests is set at fewer than ten in the application for a permit under Article 3(1) of the Act, the area obtained by multiplying 3.3 square meters by that number of guests).” Simple lodging is also subject to the rule that “where bunk beds are installed, the space between the upper and lower berths shall be approximately one meter or more.”

These figures took their current form in the amendment that took effect on June 15, 2018. Before then, hotel business and ryokan business were separate categories with minimum room counts — at least 10 rooms for a hotel and 5 for a ryokan. The amendment merged the two into a single “ryokan/hotel business,” abolished the minimum room count so that a property can operate with a single room, and streamlined many detailed dimensional requirements. Put the other way round, the current Cabinet Order only sets a minimum area per room and says nothing at all about how many guests that room may hold. That is the starting point of this article.

So who decides capacity? Article 1(1)(viii) of the Cabinet Order requires compliance with “other structural and equipment standards prescribed by ordinance of the prefecture (or, for a city with a public health center or a special ward, of that city or ward),” and Article 1(2)(vii) for simple lodging and Article 1(3)(v) for boarding-house business contain equivalent delegations. These three items are the legal basis on which municipal add-on ordinances rest. The licensing requirements are therefore never complete in the Cabinet Order alone: they can only be pinned down by reading through three tiers — Cabinet Order → ordinance of the prefecture, health-center city or special ward → the enforcement rules under that ordinance.

The Same 12 m² Holds Two Guests or Four — Comparing Local Add-On Ordinances in Practice

The numbers used to calculate capacity differ by municipality. Among the texts we were able to confirm, capacity standards for ryokan/hotel businesses ranged from 3.0 m² to 4.5 m² per guest. Applied to room sizes, that spread has very different design implications.

The right-hand column is the practical conclusion. A 12 m² Western-style room holds 4 guests in Shinjuku, 3 in Tochigi and 2 in Kyoto City. With the same drawings and the same construction cost, simply changing the municipality doubles the number of guests you can sell. The more a plan targets inbound family and group demand, the more directly this gap feeds into revenue.

The chart shows the same thing from the other direction. To hold three guests, the effective area required is 9.0 m² under a 3.0 m² standard, 10.5 m² under 3.5 m², and 13.5 m² under 4.5 m². The first two nearly coincide with the 9 m² bedded-room minimum, so in municipalities with looser standards, “a room just above the Cabinet Order minimum” works as a triple as it stands. Under a 4.5 m² standard, by contrast, 13.5 m² is needed — 1.5 times the 9 m² bedded-room minimum. For four guests the gap widens further: 12.0 m² / 14.0 m² / 18.0 m².

Ordinances Cap Guests per Unit of Floor Area — and the Way Rooms Are Sized Can Cut Capacity by Over 30%

Now to the business plan. Take a dedicated 1,000 m² hotel building with a guest-room ratio of 65% (650 m² of effective room area) and see what happens as the size of each room changes.

The bars show room count falling as rooms get larger, as expected: 72 rooms at 9 m², 48 at 13.5 m², 28 at 22.5 m². The capacity lines, however, have a ceiling. Under a 4.5 m² standard it is 650 m² ÷ 4.5 = 144 guests; under 3.0 m² it is 216. These figures are fixed purely by the guest-room share of floor area and the local standard, and no design trick can exceed them. Capacity, though, is counted room by room and rounded down. If a room’s effective area is not a whole multiple of the standard, the leftover area becomes a “remainder” that no one can be booked into. Build 59 rooms of 11 m² under a 4.5 m² standard and you get 2 guests per room, 118 in total — just 82% of the ceiling. Even under a 3.0 m² standard, 48 rooms of 13.5 m² yield 192 guests (89% of the ceiling).

The implication is clear. What sets the ceiling on capacity per unit of floor area is not the design but the municipality’s per-guest area standard itself; all the design can do is determine how close you get to that ceiling. The ceiling is 144 vs 216 guests under the 4.5 m² and 3.0 m² standards — a 1.5× difference. And with the same 12 m² room, a 3.0 m² standard gives 4 guests × 54 rooms = 216, exactly at the ceiling, while a 4.5 m² standard gives 2 guests × 54 rooms = 108, only 75% of it. Sizing rooms in whole multiples of the local standard (9, 12 or 18 m² under 3.0 m²; 9, 13.5 or 18 m² under 4.5 m²) is the design that extracts the most capacity from a given floor area. This is why it pays to read the ordinance at the site-screening stage.

Equal capacity does not mean equal revenue, however. Our estimated settled ADR for business hotels (12-month average) is about ¥14,200 in Tokyo (N=894–924 properties), about ¥10,000 in Osaka (N=487–503), about ¥10,900 in Fukuoka (N=331–341) and about ¥8,900 in Hokkaido (N=419–441). These levels assume double occupancy, and there is no guarantee that rates for triples and quads rise in proportion to the number of guests. Whether to cut room count in favor of larger rooms comes down to weighing the rise in per-room rate against the savings in fixed costs incurred per room — doors, unit bathrooms, air-conditioning units, housekeeping labor. Larger rooms become a revenue opportunity in their own right only in markets where family and group demand is deep and three or more guests can be accommodated without diluting the per-guest rate.

The left chart shows actual building plans. Taking plans whose sole principal use is hotel, with 10 or more floors and 100 or more rooms (N=13), the median gross floor area per room is 18.2 m², with an interquartile range of 15.9–21.5 m² — about 2.0 times the 9 m² legal minimum for rooms with beds. The difference is common space: corridors, elevators, stairs, the front desk, back-of-house and plant rooms. It is an obvious but easily overlooked point: even when discussing the legal minimum, you need to budget close to double that in gross floor area.

The right chart addresses which license category’s standards actually apply. Of the 1,592 new openings in 2026, 1,171 (73.6%) were in small-scale categories — vacation rentals, guesthouses, hostels, cottages, machiya townhouses, minshuku, pensions, lodges, glamping and campgrounds. The share has held at roughly 70% throughout: 73.1% in 2023, 73.3% in 2024 and 69.9% in 2025. Average rooms per property are also small, at 20 in 2024, 24 in 2025 and 25 in 2026. Many of these operate under a simple lodging license, so for the mainstream of today’s new supply, the legal standard that actually bites is not 7 m² / 9 m² but “33 m² of total guest-room floor area, or 3.3 m² per guest if under 10.”

Design-Stage Cost — Fitting 9.0 m² to Wall Centerlines Means About ¥680,000 of Rework per Room

Area standards are a binary constraint: miss them and the permit is not granted. Falling short by a fraction is not forgiven. The most common slip in practice is confusing net internal dimensions with wall-centerline dimensions.

A room laid out at 2.50 m × 3.60 m = 9.00 m² to wall centerlines becomes 2.35 m × 3.45 m = 8.11 m² net with 150 mm walls, failing the 9 m² minimum for rooms with beds. Securing 9.00 m² net requires about 9.93 m² to centerlines — about 0.93 m² more per room.

Translate that into construction cost. The 2025 hotel construction cost based on MLIT’s construction starts statistics is ¥2.405 million per tsubo for steel-frame (S) buildings (about ¥728,000/m²), so the extra 0.93 m² comes to about ¥680,000 per room, or about ¥135 million for a 200-room project. Factoring in construction-cost inflation over the build period pushes the figure higher. Assuming a 2029 opening with construction in 2027–2029, and compounding at 5.3% (2026), 5.0% (2027) and 4.5% (2028) to the midpoint, the unit cost becomes about ¥841,000/m², and the same 0.93 m² costs about ¥780,000 per room, or about ¥156 million for 200 rooms.

That said, this amount is less “rework discovered after the fact” than “a precondition that costs nothing extra if built in early.” Fix the net-dimension basis and the municipality’s capacity formula at the schematic-design stage and the cost is absorbed into the original budget rather than added to it. Rising construction costs also tend to restrain new supply, which is an upside for owners of existing stock in the form of a softer competitive environment.

Checklist for Acquirers and Developers — the Order in Which to Read the Ordinances

Summary — Read the Ordinance’s Per-Guest Area Before the Legal Minimum

The minimum room sizes set by the Enforcement Order of the Hotel Business Act are 7 m² for a ryokan/hotel business, 9 m² for rooms with beds, and 33 m² of total guest-room floor area for simple lodging (3.3 m² per guest if under 10). Since the June 15, 2018 amendment abolished minimum room counts, these area standards have been the main numerical constraints left in the Cabinet Order.

The Cabinet Order, however, contains no capacity rule; Article 1(1)(viii), (2)(vii) and (3)(v) delegate it to local ordinances. Even within the scope of this article, ryokan/hotel capacity standards ranged from 3.0 m² to 4.5 m² per guest, and the same 12 m² Western-style room held two guests or four depending on the municipality. In a model with 1,000 m² of gross floor area and 65% in guest rooms, the capacity ceiling is 144 guests under a 4.5 m² standard and 216 under 3.0 m², fixed by the ordinance alone — it is the ordinance, not the design, that sets the ceiling on capacity per unit of floor area. Design determines how close you get to that ceiling: if room sizes are not whole multiples of the standard, you lose up to 25% at the increments in Table 3, and over 30% with rooms in the 13 m² range under a 4.5 m² standard.

Meanwhile, more than 70% of new supply is in small-scale categories that often operate under a simple lodging license, and for this segment what matters is not 7 m² / 9 m² but 33 m² and 3.3 m². At the site-screening and early due-diligence stages, do not stop at the Cabinet Order figures: go down to the responsible municipality’s ordinance and rules and pin down the capacity formula and area measurement method. What is a line item in the budget when built in early becomes rework when discovered late.