| Primary value | 1 per 15 persons |
| Applies to | Office buildings · Workplaces with female staff |
| Exceptions | Male (separate count) → 1 per 25 |
| Measured as | Provide 1 water closet for every 15 female occupants. |
| Source | NBC 2016 — Part 9, Section 2 ✓ Verified |
Female WC ratios are higher than male because women lack urinal alternatives — every fixture must serve every visit. The 1:15 ratio reflects this and ensures gender parity in facility wait times.
Modern offices increasingly provide more female WCs than the minimum to align with workforce demographics and prevent queues.