| Primary value | 450 – 600 mm (typical) (above road / NGL · NBC ≥ 150 mm) |
| Applies to | Residential bungalows and apartment ground floors · Commercial buildings without basement · Sites in flood-prone or low-lying areas (raise plinth higher) |
| Exceptions | NBC absolute minimum → 150 mm |
| Standard residential → 450 – 600 mm | |
| Flood-prone area → +200 to 500 mm above HFL | |
| Bungalow with steps for character → 750 mm – 1.0 m | |
| Commercial / wheelchair-access ground floor → 150 – 300 mm with ramp | |
| Measured as | Vertical distance from the average natural ground level (or finished road / driveway level adjacent to the plot) to the finished floor level (FFL) of the ground floor. |
| Source | NBC 2016 — Part 3, Cl. 13.4 ✓ Verified |
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Plinth height keeps moisture and surface water out of the ground floor. NBC's 150 mm absolute floor is rarely enough — most Indian sites run drainage at 1:80 to 1:100, so even a small storm can bring water 100 mm up against the wall. 450–600 mm is the comfortable margin that handles monsoon backup + adds stairs / character to the entrance.
Indian bungalows typically build a 450–600 mm plinth band of 230 mm thick brick / RCC + DPC + plinth beam at top. Apartments with stilt parking have a much taller plinth (~3.0 m if the stilt is full-height). Flood-zone projects use raised plinths up to 1.0 m above HFL with ramps for accessibility.