| Primary value | 1 per 25 persons |
| Applies to | Office buildings · Workplaces with male staff |
| Exceptions | Female (separate count) → 1 per 15 |
| Measured as | Provide 1 water closet for every 25 male occupants. Round up to the next whole number. |
| Source | NBC 2016 — Part 9, Section 2 ✓ Verified |
Adequate WC counts prevent queueing during peak hours (lunch breaks, shift changes). NBC's 1:25 ratio for males balances facility cost against user comfort and matches typical workplace usage patterns.
Most office building drawings show this count, often supplemented by an additional WC in each men's restroom for redundancy and accessibility.