OKJK.22.12.05

Standards of Permission for Temporary Buildings at the 2025 World
Exposition in Japan (the Expo 2025 Osaka, Kansai, Japan), based on theprovisions of Article 85 paragraph 6 and paragraph 7 of the BuildingStandards Act
Established: December 1, 2021
Most recently revised: December 1, 2021
(Purpose)
Article 1.

The purpose of these Standards is to specify necessary items fordetermination by the Designated Administrative Agency that a temporary building is
not detrimental from the viewpoints of safety, fire prevention, and sanitation in
granting of permission under the provisions of Article 85 paragraph 5 and paragraph 6of the Building Standards Act (Act No. 201 of 1950) (hereinafter referred to as “Act”),
and thereby to carry out proper operation of said Act.

(Definition of Terms)
Article 2.

In these Standards, the meanings of the terms listed in the following

items shall be as specified in the respective items:(1) Open spaces, etc.: Entrances, plazas and passageways of 5 m or more in width
having no roofs or sheds thereon, and passageways under the Grand Roof (Ring),
which are provided for use by visitors(2) Management passageways: Passageways 5 m or more in width which are used forcarrying in goods, etc.
(3) Theaters, etc.: Theaters, movie theaters, entertainment halls, grandstands, publichalls, and assembly halls(4) Exhibition halls, etc.: Exhibition halls, amusement halls, dining facilities, andstores engaged in sales of goods

(Scope)
Article 3.

These Standards shall apply to temporary buildings to be erected on thesite of the Expo 2025 Osaka, Kansai, Japan.
(Permission Criteria)
Article 4.
1.

Basic Requirements(1) Sites of buildings shall abut on open spaces, etc. or management passageways for 2m or more.
(2) Sites of buildings for use as theaters, etc. or exhibition halls, etc. shall abut on openspaces, etc. or management passageways on at least two sides of the site concerned,and shall be planned so as to allow for evacuation. For the avoidance of doubt, atleast one side thereof shall abut on an open space, etc. for 4 m or more (5 m or morein cases of sites of buildings for use as theaters, etc.).
(3) The building coverage ratio shall be 7/10 or less and open spaces shall be provided
around any such the site.
2.

Structural Capacity

With respect to any building listed in any item of Article 20 paragraph 1 of the Act, thestandards stipulated in the item concerned shall be applied mutatis mutandis to ensure
safety. In such case, a building whose safety is confirmed by structural calculation inaccordance with the standards set forth in Article 81 paragraph 2 item (1) of theBuilding Standards Act Enforcement Order (Cabinet Order No. 338 of 1950; hereinafterreferred to as “Order”) shall undergo a structural calculation conformity review work by
a designated structural calculation conformity review body as prescribed in Article
77-35-5 paragraph 1 of the Act, and shall receive a conformity review notification before
a confirmation completion certificate is issued.
3.

Interior Restrictions

Restrictions on interiors of buildings for use as theaters, etc. or exhibition halls, etc. andon rooms where naked flame is to be used shall be as stipulated in the following items:(1) Buildings for use as theaters, etc. or exhibition halls, etc. (limited to those whoseparts for such use have aggregate floor areas of 100 sq m or more) shall have theinterior surfaces (excluding crown moldings, windowsills, etc.; the same shall apply
to items (1), (2) and (3) of this paragraph) of the walls and ceilings (or roofs, if there
are no ceilings; the same shall apply to items (1), (2) and (3) of this paragraph) ofhabitable rooms for said use finished as specified in Article 128-5 paragraph 1 item
(1) of the Order, and the interior surfaces of the walls and ceilings of principal
corridors, stairways and other passageways leading to the ground from thehabitable rooms for said use shall be finished as specified in item (2) of the sameparagraph.
(2) In cases where buildings have habitable rooms for use as theaters, etc. or exhibition
halls, etc. on the basement level, the interior surfaces of the walls and ceilings ofthe said habitable rooms and principal corridors, stairs and other passageways
leading to ground level from said habitable rooms shall be finished as described in
Article 128-5 paragraph 1 item (2) of the Order.
(3) In cases where buildings have rooms where naked flame is to be used, the interior
surfaces of the walls and ceiling thereof shall be finished as specified in Article
128-5, paragraph 1 item (2) of the Order, and such rooms shall be separated fromother parts by floors or walls, or specified opening protective assemblies of quasi
fire-resistant construction, as specified in the provisions of Article 112 paragraph 2and paragraph 19 item (2). For the avoidance of doubt, if the rooms in which naked
flame is to be used cannot be separated from other parts, the interior surfaces of thewalls and ceiling of the entire part shall be finished as specified in Article 128-5
paragraph 1 item (2) of the Order.
(4) The provisions of the preceding items shall not apply to parts of buildings that are
equipped with sprinkler equipment and/or water or foam fire-extinguishingequipment, and others similar thereto which operate automatically (hereinafterreferred to as “sprinkler equipment, etc.”), and smoke exhaust equipment which
conforms to the provisions of Article 126-3 of the Order, except for separated parts
as specified in the preceding items.
(5) The provisions of items (1) and (2) (excluding those relating to stairways) shall not
apply to those structures which have been confirmed by each method forverification of evacuation safety as providing safe evacuation performance, or tothose which have been approved by the Minister of Land, Infrastructure, Transportand Tourism.

4.

Seating Capacities of Auditoria in Theaters, etc.

The seating capacities of auditoria in theaters, etc. shall be the values obtained bycalculation as specified in each item below (with fractions after the decimal pointrounded down) depending on the design of the auditorium concerned:(1) For individually separated chair seats, the number of such seats;(2) For seating spaces with bench-style seats, the value obtained by dividing the total
length of the benches (in units of cm) by 40;(3) For chair seats under an unspecifiable layout; the value obtained by dividing thearea of the seating space (in units of sq m) by 0.45;(4) For standing-only rooms, the value obtained by dividing the area of each such room
(in units of sq m) by 0.2.
5.

Structures of Theaters, etc.

The structures of theaters, etc. shall be as specified in each of the following items:(1) The principal exits to the outside of buildings for use as theaters, etc. on evacuation
floors to be used by audience members shall face open spaces, etc. or passageways
having a width of 5 m or more and leading to open spaces, etc., and exits other thanthe principal exits shall face passageways having a width of not less than 1.5 m andleading to open spaces, etc. or management passageways.
(2) In cases where chair seats are installed in seating spaces, such seats shall, inprinciple, be fixed to the floor, and the anteroposterior space between seats (refers
to the distance between the rear end of a front seat and the front end of the seatbehind it; the same shall apply hereinafter) shall be not less than 35 cm on ahorizontal projection basis.
(3) In the case where a seating space is provided on stepped floors with a 50 cm or morelevel difference between steps, a handrail of 75 cm or more in height shall be
installed in front of such seating space; provided, however, that this shall not apply
if there is no objection from the viewpoint of safety by means such as installing abroad-width parapet wall in front of the seating space.
(4) Aisles, cross-aisles, etc. in indoor auditoriaa.

Location of aisles/cross-aisles

(a) In cases where chair seats are installed in the seating space,aisles/cross-aisles shall be located as specified below:i.

An aisle shall be provided for every standard number of seats per row(eight (8) seats plus one (1) seat per every centimeter of theanteroposterior distance in excess of 35 cm) on both sides of a row ofseats; provided, however, that an aisle on one side only may suffice inany of the following cases:(i)

Where a row of seats comprises four (4) seats or fewer;(ii) Where a row of seats comprises more than four (4) seats and thetotal number of seats in the row is not more than four (4) plus one(1) seat per every 2 cm of the anteroposterior distance in excess of
35 cm.
ii.

Aisles with seating spaces on both sides shall connect at both the front
end and the rear end to either cross-aisles or entrances/exits of theauditorium, and shall also connect to one (1) cross-aisle per every 20
seats or fewer in a column of seats; provided, however, that this shallnot apply in any of the following cases:(i)

Where such an aisle connects to either an entrance/exit of theauditorium or a cross-aisle and is 10 m or less in length;(ii) Where aisles are installed on both sides of the auditorium interior,and at least one (1) entrance/exit is installed along each aisle per
the number of seats indicated the right-hand column of the tablebelow, according to the number of seats in a row, as indicated in
the left-hand section of the table.
Number of seats in a row

Number of seats in a column

8 or fewer

159 or more and 12 or fewer

1013 or more and 20 or fewer

621 or more and 31 or fewer

432 or more3

(b) Each cross-aisle shall connect at each end to an entrance/exit of theauditorium; provided, however, that this shall not apply if the length
thereof is 10 m or less or if there is no objection from the viewpoint ofsafety.
(c) In cases where two or more entrances/exits are provided in an auditorium,
the length of any section which is common to all ordinary walking
passages leading from each seat to each entrance/exit shall not exceed 5 m.
b.

Width of aisles, cross-aisles, etc.
(a) The width of aisles with chair seats arranged on both sides shall be 80 cm(or 60 cm in the case of those with chair seats on only one side) or more,
and shall have a width that ensures 0.6 cm or more per person expected topass through any such aisle.
(b) Cross-aisles shall be 1 m or more wide, and have a width that ensures 0.6
cm or more per person expected to pass through any such cross-aisle.
(c) The width of rows between chair seats, and the width of aisles andcross-aisles shall not, in principle, be tapered in the direction ofevacuation.

(5) Restrictions on slope-ways, etc.
a.

In cases where passageways are slope-ways, the slope shall be 1/10 (or 1/8 withhandrails installed) or less.

b.

Aisles(a) In cases where aisles are stepped, the rise shall be 18 cm or less and thetread 26 cm or more.
(b) In the case where the level difference of a stepped aisle exceeds 3 m, theaisle shall connect to any of a cross-aisle, a corridor, or a stairway per
every 3 m or less in height; provided, however, that this shall not apply to a
stepped aisle with a gradient not exceeding 1/5.

c.

Cross-aisles shall not be stepped.

(6) The number of entrances/exits to be used to exit directly from auditoria shall be notless than the relevant number indicated in the table below:
Seating capacity of auditorium

Number of entrances/exits

Fewer than 3002300 or more and fewer than 600

3600 or more and fewer than 1,000

41,000 or more

5(7) Entrances/exits shall be located so as to be easily recognizable from the inside of theauditoria and shall be sufficiently separated from each other so that no multiple
number of entrances/exits become unusable simultaneously due to smoke, heat, etc.
caused by a fire.
(8) Entrances/exits shall be 1 m or more wide, and have a width that ensures 0.8 cm or
more per person expected to pass through any such entrance/exit. Doors forentrances/exits shall be installed so as to open outward and provided in a mannerso as not to obstruct evacuation.
(9) The dead-end of any corridor for use by audience members shall be 10 m or less long.
Any such corridor shall be 1.2 m or more wide, and shall have a width that ensures
0.8 cm per person expected to pass through such corridor. In addition, the width
thereof shall not, in principle, be tapered in the direction of evacuation.
(10) In cases where corridors for use by audience members are slope-ways, the slope
shall be 1/12 or less (or 1/8 where the level difference is 16 cm or less). In cases
where corridors are stepped, the rise shall be 18 cm or less and the tread 26 cm ormore.
(11) The number of entrances/exits of theaters, etc. or of parts for use as theaters, etc.
shall be two or more. Such entrances/exits shall be sufficiently distant from eachother and shall be located so as to ensure smooth evacuation from the auditorium
concerned.
(12) Entrances/exits of theaters, etc. or of parts for use as theaters, etc. shall be 1 m or
more wide and shall have a width that ensures 0.8 cm per person expected to passthrough any such entrance/exit. Doors for entrances/exits shall be installed so as toopen outward and provided in a manner so as not to obstruct evacuation.

(13) Stairways to be used by audience members shall be located so as to be recognizable
directly from entrances/exits of auditoria and from corridors for use by audience
members, etc. so that smooth evacuation from auditoria is ensured; provided,
however, that this shall not apply in cases where guide lights indicating thelocations of stairways are installed at conspicuous points in corridors, etc.
(14) Stairways to be used by audience members shall have a width that ensures 1 cm or
more per person expected to pass through any such stairway, and entrances/exits
to/from such stairways shall have a width to ensure at least 0.8 cm per person
expected to pass through such stairways. Doors for entrances/exits shall be
designed to open in the direction for evacuation.
(15) Stairways in parts for use as theaters, etc. shall not be used as stairways for otheruses (including those in parts for use as other theaters, etc.) on the same floor;
provided, however, that this shall not apply if they come under both of the following
cases:a.

In cases where routes to any such stairway do not pass through any parts forother uses (excluding lobbies, corridors, etc. for common use);b.

In cases where the width of any such stairway exceeds the aggregate of widthsof stairways necessary for each use of any such stairway.

(16) The width of exits on the evacuation floors of stairways shall be at least 8/10 of thewidth of the stairway concerned, and doors shall be designed to open in thedirection for evacuation.
(17) In cases where stairways of parts for use as theaters, etc. face the interior of thebuilding at its evacuation floor(s), the routes from the exits of such stairways to theoutside of buildings shall not go through any parts for other uses (excluding lobbies,corridors, etc. for common use).
6.

Structures of Exhibition Halls, etc.

The structures of exhibition halls, etc. shall be as specified in the following items:(1) Buildings where the floors other than evacuation floors are used as exhibition halls,etc. shall have two (2) or more stairways leading directly to evacuation floors or theground level from the floors for said uses; provided, however, that this shall not
apply to buildings with a total floor area of 100 sq m or less on floors used for such
purposes, or where the main structural elements of the parts used for such purposesare of quasi-fireproof construction or are made of non-combustible materials.
(2) Exits to the outside on evacuation floors shall be as specified below:a.

Two (2) or more exits to the outside shall be properly provided so that there are
no objections from the viewpoint of evacuation.

b.

The width of principal exits to the outside shall be 1.5 m or more, and those ofother exits 90 cm or more.

c.

Doors for exits shall not be installed so as to open inward and shall be designed
so that there is no objection from viewpoint of evacuation.

d.

Exits to the outside other than such exits as are prescribed in Article 125
paragraph 1 of the Order shall face passageways that are not less than 90 cm
in width (or 1.5 m where such passageways are common to two (2) or more exits
to the outside) leading to open spaces, etc. or to management passageways.

7.

Building Equipment

Lavatories shall have flush toilets, and the sewage of lavatories shall be drained into asewer or treated by a wastewater purifier under the provisions of Article 31 paragraph 2of the Act, and effective openings or ventilation equipment shall be provided inlavatories for air circulation.

(Permissions not Covered by Standards of Permissions as Specified in Article 4)
Article 5.

Permissions granted under the provisions of Article 4 shall not preclude

any permission for which it is concluded that there is no objection from the viewpoints ofsafety, fire prevention, and sanitation.

(Addition of Requirements)
Article 6.

Any requirements deemed to be necessary for safety, fire prevention,

and/or sanitation may be prescribed in addition to permissions granted under theprovisions of these Standards.

(Application Procedure)

Article 7.

The application procedure for permissions under these Standards shallbe as specified in “Guidelines on Application Procedures for Permissions for the 2025
World Exposition in Japan under the provisions of Article 85 paragraph 5 andparagraph 6 of the Building Standards Act.”
Supplementary Provisions
These Standards shall come into force on December 1, 2021.
Supplementary Provisions
These Standards shall be come into force on September 2, 2022.

*English version prepared by BLC Corporation, Osaka, Japan.
Website: hppts.//www.blc-corporation.co.jp
E-mail: blc@blc-corporation.co.jp