When a Single-User or All-Gender Restroom Is Required or Allowed (IBC)

The short answer: A single-user toilet room (one water closet and one lavatory in a lockable, single-occupant room) can satisfy plumbing requirements in defined situations and, importantly, counts toward the required fixtures for both sexes because it serves all occupants. Under the IBC, where the required number of fixtures is low, single-user facilities may be used in place of separate gendered rooms; and recent code editions increasingly permit (or in some jurisdictions require) all-gender single-user rooms. Single-user/all-gender rooms must still meet accessibility requirements and carry compliant signage. Whether a single-user room is allowed (or required) for your project depends on occupancy, occupant load, and the adopted edition plus any local amendments — several states and cities have their own all-gender mandates.

What a single-user room is

A single-occupant toilet room: one WC (sometimes a urinal added), one lavatory, with a door that locks from inside for privacy. Because only one person uses it at a time, it serves everyone.

Why it counts for both sexes

A single-user room isn't "men's" or "women's" — it's available to anyone. So in the fixture tally it counts toward the requirement for both sexes simultaneously, which is why a pair of single-user rooms can satisfy a small occupancy's requirement efficiently.

When it's allowed

Where the required fixture count is small, the code generally permits single-user facilities instead of separate multi-fixture gendered rooms. The exact threshold is in Chapter 29 of the adopted edition. Larger occupant loads still require multi-fixture, separated facilities.

All-gender rooms and local rules

Newer editions and many state/local laws address all-gender facilities — some require single-user rooms to be signed as all-gender, some mandate all-gender options. This is an area of significant local variation, so confirm the jurisdiction's specific rule rather than assuming the model code.

Signage and accessibility

Single-user/all-gender rooms need compliant signage and must meet accessibility clearances and fixtures like any required toilet room.

Common review comments

  • Single-user room used where occupant load requires full separate facilities.
  • Signage not compliant with the jurisdiction's all-gender rules.
  • Accessibility clearances missing in the single-user room.

See also our fixture calculation guide and commercial restroom guide.

Model IBC framing; all-gender requirements vary widely by state/local law and edition. Verify against your codes of record and local amendments.

← Browse all guidesRun a free scan →