NBC 2016:2016 Part 9 is the Indian Standard (BIS) for national building code of india 2016 - plumbing services. Part 9 is the plumbing services Part, with two sections. Section 1 covers water supply, drainage and sanitation, including solid waste management within the premises: water demand by building type, hydraulic calculation procedures, minimum fixture counts by occupancy, drainage layout with the Drainage Fixture Unit method, rainwater harvesting, and onsite waste handling. Section 2 covers the distribution of LPG and PNG inside buildings — pipe materials, valve locations, ventilation of gas banks, and safety devices. For plumbing design, Part 9 is used in parallel with the Uniform Plumbing Code - India (UPC-I) which many consultants have adopted for more detailed fixture unit and venting rules. Water supply and waste water treatment plant sizing usually follows CPHEEO manuals.
Covers plumbing services through two sections: Water Supply, Drainage and Sanitation (including Solid Waste Management); and Gas Supply. Addresses pipe sizing, fixture counts, waste disposal, and natural/LPG gas distribution inside buildings.
LPCD water demands by occupancy, fixture-count tables, drainage pipe sizes and slopes, septic-tank sizing rules.
| Reference | Value | Clause |
|---|---|---|
| Water demand — Residential (with full flushing)— CPHEEO baseline; NBC uses 135–200 | 135 LPCD | Table 4.1 |
| Water demand — Residential (premium / metro) | 150 – 200 LPCD | Cl. 4.2.1 & Table 4.1 |
| Water demand — Hostel / boarding | 135 LPCD | Table 4.1 |
| Water demand — Hospital (with laundry, per bed) | 450 L/bed/day | Table 4.1 |
| Water demand — Hotel (per bed) | 180 L/bed/day | Table 4.1 |
| Water demand — Office (per head) | 45 L/person/day | Table 4.1 |
| Water demand — School (day) | 45 L/student/day | Table 4.1 |
| Fixture — WC (residential) | 1 per dwelling unit (min) | Table 7.3 |
| Fixture — WC (office, male) | 1 per 25 (≤25), then +1 per 50 | |
| Fixture — Urinal (office, male) | 1 per 25 (≤50), then +1 per 50 | |
| Fixture — Wash basin (office) | 1 per 25 (≤25), then +1 per 50 | |
| Fixture — WC (assembly, public) | Male: 1 per 100; Female: 1 per 50 | |
| Min storage — domestic OHT (residential) | 1 day (≥ 50% of daily demand) | |
| Min storage — fire (combined w/ domestic) | Per Part 4 fire-pump table | Cl. 4.8.1.1 |
| Hot water demand — Residential | 45 L/person/day at 60 °C | Annex B, Table 21 |
| Soil pipe — min size (single WC) | 100 mm dia | Cl. 5.5.1 |
| Waste pipe — min size (basin / kitchen) | 40 mm (basin); 50 mm (kitchen sink) | |
| Vent pipe — min size | 50 mm (extends ≥ 600 mm above roof) | Cl. 5.6.1 & Cl. 5.6.2 |
| Drainage pipe — min slope (100 mm) | 1 in 60 | Cl. 5.7 & Table 12 |
| Drainage pipe — min slope (150 mm) | 1 in 100 | Cl. 5.7 & Table 12 |
| Septic tank — min capacity (5 users)— ref IS 2470 Part 1 | 1.0 m³ (eff. liquid) | Cl. 5.8.1.3 & Table 17 |
| Septic tank — min liquid depth | 1.0 m (1.8 m for >50 users) | Cl. 5.8.1.4 |
| Manhole spacing — sewer line | ≤ 30 m (typ.) | Cl. 5.7.3 |
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| High-Rise Building Definition Threshold | Building height ≥ 15 m | Building with an occupied floor > 75 ft (≈ 23 m) above lowest level of fire dept. vehicle access | IBC 2024 |
| Mandatory Refuge Area Requirement | Yes, for buildings > 24m, at 24m and then every 15m. Area is 0.3 m²/person or 15 m² min. | No specific prescriptive requirement; addressed by other means like evacuation elevators or additional stairwells. | IBC 2024 |
| Min. Corridor Width (Institutional/Hospitals) | 2.0 m for non-ambulatory patients; 2.4 m if for stretcher movement | 96 inches (≈ 2.44 m) in new healthcare occupancies | NFPA 101:2024 |
| Max. Travel Distance (Business Occupancy, Sprinklered) | 45 m | 300 ft (≈ 91 m) | NFPA 101:2024 |
| Fire Resistance of Exit Stair Enclosure (High-Rise) | 2 hours | 2 hours | IBC 2024 |
| Automatic Sprinkler Trigger (New Hotels) | Mandatory if height > 15 m | Required in all new hotels, regardless of height (with few exceptions for small buildings) | NFPA 101:2024 |
| Ramp Slope (Means of Egress) | Maximum 1 in 10 (10%) | Maximum 1 in 12 (≈ 8.3%) | IBC 2024 |