3.4 Multi-User, Single-User & Family/Assisted-Use Facilities
Key Takeaways
Under IPC 403.1.2, fixtures in single-user and family rooms count toward required fixtures and are deducted proportionately from the gender ratios.
IBC 1110.2.1 requires a family or assisted-use toilet room in assembly and mercantile occupancies requiring an aggregate of six or more water closets.
Family or assisted-use rooms must be within one story and 500 feet of the separate-sex rooms, lockable from inside, with an occupied indicator.
IPC 403.1.1 Exception 2 sizes multiple-user all-gender facilities at 100 percent of the total occupant load.
IBC 1110.4.1 (2024) requires an adult changing station wherever an assembly or mercantile occupancy must provide a family or assisted-use room.
Multi-User, Single-User & Family/Assisted-Use Facilities
Restroom design has moved from strictly separate multi-stall rooms toward flexible layouts that serve people of all genders, parents with young children, and people with disabilities who need help from a companion of a different sex. The 2024 International Plumbing Code (IPC) and International Building Code (IBC) handle these rooms in four places: IPC 403.1.2 (single-user and family rooms), IPC 403.1.1 and 403.2 (all-gender multiple-user rooms), IBC 1110.2.1 (family or assisted-use rooms) and IBC 1110.4 (adult changing stations).
A plumbing plans examiner must know how these rooms count toward Table 403.1, when they are mandatory, and which dimensions ICC A117.1-2017 applies.
1. Single-User Toilet and Bathing Rooms (IPC 403.1.2)
A single-user toilet facility is a room intended for one occupant (or a family/assisted-use group) at a time, typically one water closet and one lavatory behind a lockable door.
Fixture Counting Rules
- Under IPC 403.1.2, fixtures in single-user toilet facilities and single-user bathing rooms, including family or assisted-use rooms, contribute toward the total number of required fixtures for the building or tenant space.
- Those fixtures are deducted proportionately from the required gender ratios of Table 403.1.
- Single-user rooms must be identified as available for use by all persons regardless of their sex.
- The total number of fixtures may be based on the required separate facilities or on any combination of single-user and multiple-user facilities.
Example: A tenant space requires 2 male and 2 female water closets. If one single-user room is provided, its water closet is deducted proportionately (half a fixture from each sex). The examiner then confirms that the remaining multi-user rooms, plus the single-user room, meet the Table 403.1 total.
Separate facilities by sex are not required where single-user rooms are provided under 403.1.2 (IPC 403.2 Exception 5).
2. Family or Assisted-Use Toilet and Bathing Rooms (IBC 1110.2.1)
A family or assisted-use room lets a person with a disability receive help from a companion of a different sex, and serves parents with children.
When It Is Required (IBC 1110.2.1)
- Assembly and mercantile occupancies: an accessible family or assisted-use toilet room is required where an aggregate of six or more male and female water closets is required. In mixed-occupancy buildings, only the water closets required for the assembly or mercantile occupancy count toward the trigger.
- Recreational facilities with separate-sex bathing rooms must provide an accessible family or assisted-use bathing room. This is not required where each separate-sex bathing room has only one shower or bathtub.
- Fixtures in family or assisted-use rooms are included in the number of fixtures provided in the occupancy.
Required Room Features (IBC 1110.2.1.2 through 1110.2.1.6)
- Fixtures: Only one water closet and only one lavatory. A urinal, a child-height water closet, a child-height lavatory, or an adult changing station also used for bathing may be added. A family bathing room has only one shower or bathtub plus one water closet and one lavatory.
- Location: On an accessible route, not more than one story above or below the separate-sex toilet rooms, with an accessible route of not more than 500 feet from them. In airports and passenger transportation facilities, the route may not pass through security checkpoints.
- Privacy: Doors must be securable from within the room and have an "occupied" indicator.
- Accessibility (ICC A117.1-2017): In new construction, a turning space of a 67-inch circle (or the permitted T-shaped space) that is not inside a toilet compartment; water closet clearance of 60 inches wide by 56 inches deep; the water closet centerline 16 to 18 inches from the side wall; a seat 17 to 19 inches high; a rear grab bar at least 36 inches long; and a side-wall horizontal bar at least 42 inches long plus an 18-inch vertical bar.
3. Multiple-User All-Gender Toilet Rooms
The 2024 IPC explicitly recognizes multiple-user rooms that serve all persons regardless of sex:
- Fixture count (IPC 403.1.1 Exception 2): Where multiple-user facilities are designed to serve all genders, the minimum fixture count is calculated at 100 percent of the total occupant load (not divided in half), and each fixture type must comply with ICC A117.1.
- Separate facilities waived (IPC 403.2 Exception 6): Separate facilities are not required where rooms with both water closets and lavatories are designed for all persons and privacy is provided under 405.3.4 and 405.3.5.
- Water closet privacy (IPC 405.3.4): Each water closet must occupy a separate compartment with walls or partitions and a door enclosing the fixture.
- Urinal privacy (IPC 405.3.5): Each urinal needs partitions at least 30 inches apart that project the greater of 18 inches or 6 inches past the urinal lip and extend from 12 inches or less to at least 60 inches above the floor.
- Signage (IPC 403.4): Signs near the entrance indicate the room is for all persons regardless of sex.
The model code does not require floor-to-ceiling compartments or "no-gap" doors in all-gender rooms. Some jurisdictions add those features by local amendment, so check the adopted code before citing them.
4. Adult Changing Stations and Diaper Changing Tables
Adult Changing Stations (IBC 1110.4, 2024)
At least one adult changing station is required:
- In assembly and mercantile occupancies, where a family or assisted-use toilet or bathing room is required by IBC 1110.2.1.
- In Group B educational facilities for students above the 12th grade, where an aggregate of 12 or more water closets is required to serve classrooms and lecture halls.
- In Group E occupancies, where an assembly room or space requires an aggregate of six or more water closets.
- At highway rest stops and service plazas.
The station goes in a toilet room with only one water closet and one lavatory, or in the family/assisted-use room. Its fixtures count toward the occupancy total, and occupants must be able to reach it whenever the occupancy is open. The route from separate-sex rooms may not pass through security checkpoints, and the station must be within two stories and 2,000 feet of travel.
Diaper Changing Tables
The 2024 IPC and IBC do not require baby diaper changing tables. Where they are provided, ICC A117.1-2017 Section 603.5 requires them to meet the operable-part rules of Section 309 and the work-surface rules of Section 902. When a fold-down table is deployed, check that it does not obstruct the water closet clearance, fixture clear floor spaces or the turning space.
5. Signage and Tactile Markings
- IPC 403.4: Required public toilet facilities need readily visible signs near the entrance showing whether the facility is for males, females or all persons. IPC 403.4.1 requires directional signs to the facilities, visible from the main entrance.
- IBC 1112.2: Signs identifying toilet and bathing rooms must have visual characters, raised characters and braille complying with ICC A117.1. IBC 1112.3 requires directional signs at each separate-sex toilet room pointing to the nearest family or assisted-use room.
- ICC A117.1 Section 703: Tactile characters are mounted with the baseline of the lowest line at least 48 inches and the baseline of the highest line not more than 60 inches above the floor, on the latch side of the door.
- International Symbol of Accessibility: Required at accessible toilet or bathing rooms where not all toilet or bathing rooms are accessible (IBC 1112.1).
6. Plan Examiner Traps & Common Audit Violations
- Missing the Family Room at Six Water Closets: An assembly or mercantile occupancy requiring 3 male and 3 female water closets has an aggregate of six, so IBC 1110.2.1 requires a family or assisted-use room.
- Counting the Family Room Twice: Its water closet and lavatory count once toward the total and are deducted proportionately from the gender ratios (IPC 403.1.2). They are not counted as one fixture for each sex.
- Halving the Load in an All-Gender Room: A multiple-user all-gender room is sized at 100 percent of the total occupant load (IPC 403.1.1 Exception 2).
- Using 2009 Dimensions: In new construction, ICC A117.1-2017 uses a 67-inch turning circle and 30-by-52-inch clear floor spaces. The 60-inch and 30-by-48-inch values apply only to existing buildings.
- Missing the Adult Changing Station: Since 2024, an assembly or mercantile building that triggers a family room also triggers an adult changing station (IBC 1110.4.1).
In an Assembly (Group A-1) movie theater complex, the calculated minimum plumbing fixture count requires 8 water closets for females and 6 water closets for males (14 total). According to IBC Section 1110.2.1, what is required for family or assisted-use toilet rooms?
Two family or assisted-use toilet rooms are required whenever more than 10 total fixtures are installed.
Family or assisted-use toilet rooms are optional amenities and never mandatory in Group A occupancies.
A family or assisted-use toilet room is required only if the total occupant load exceeds 2,000 persons.
At least one family or assisted-use toilet room is required, because 6 or more water closets are required.
When a family or assisted-use toilet room containing one water closet and one lavatory is provided in an assembly building, how does it count toward the minimum plumbing fixtures required by IPC Table 403.1?
It counts as two water closets and two lavatories because it serves both sexes.
It cannot be counted toward the required fixture count and must be provided strictly in addition to all required male and female fixtures.
Its water closet and lavatory count toward the total required fixtures and are deducted proportionately from the gender ratios.
It counts only toward the female fixture count because of longer wait times.
An architectural submittal shows a multiple-user all-gender toilet room with water closets and lavatories instead of separate men's and women's rooms. Under the 2024 IPC, which requirement applies?
Each water closet must have floor-to-ceiling partitions with no gaps at the doors, and the fixture count is based on half of the total occupant load.
The fixture count is based on 100 percent of the total occupant load, and each water closet must be in a compartment with walls or partitions and a door.
Water closet compartments are optional because the room is used by all persons.
The room may be used only if the building's occupant load is 15 or fewer.
A new mercantile department store is required by IBC Section 1110.2.1 to provide a family or assisted-use toilet room. Under the 2024 IBC, what else is required?
Baby diaper changing tables in both the men's and women's rooms
Nothing further, because adult changing stations apply only to highway rest stops
At least one accessible adult changing station, in a single-user or family room
A second family or assisted-use room on every floor
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