| Primary value | 0.90 m |
| Applies to | Bedrooms · Living rooms · Dining rooms · Study rooms |
| Exceptions | Door height → 2.0 m min |
| Measured as | Clear opening width with door at 90°. |
| Source | NBC 2016 — Part 4, Clause 4.2 ✓ Verified |
0.9 m allows a single bed (typically 0.9-1.0 m wide) to be carried in flat, and lets two people pass when the door is open. It's the universal standard for habitable room doors.
Almost every Indian residential project uses 0.9 m bedroom doors. Wider 1.0 m doors are sometimes used for accessibility.