| Primary value | 2.8 m² |
| Applies to | Combined bath + WC compartments · Standard residential bathrooms |
| Exceptions | Minimum width → 1.2 m |
| Measured as | Carpet area of the combined compartment within walls. |
| Source | NBC 2016 — Part 4, Clause 5.4.5 ✓ Verified |
Combining bath and WC in one room is the dominant Indian residential pattern. 2.8 m² is the smallest size that fits a basin, WC, and shower zone without overlap.
Mid-range apartments provide 3.5–5 m². Modern hotel bathrooms are typically 4-5 m². Premium housing reaches 6-8 m².