NBC 2016:2016 — National Building Code of India 2016 - Plumbing Services

NBC 2016 Part 9 : 2016

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National Building Code of India 2016 - Plumbing Services

NFPA 101 · IBC 2024 · BS 9999

CurrentFrequently UsedCode of PracticeBIMMEP · Water Supply and Plumbing

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Overview

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.

Status: Current
Usage level: Frequently Used
Domain: MEP — Water Supply and Plumbing
Type: Code of Practice

International equivalents

NFPA 101:2024 · NFPA (US)IBC 2024 · ICC (US)BS 9999:2017 · BSI (UK)BCA 2022 · ABCB (Australia)

Typically used with

IS 1742 IS 2065 IS 12251 IS 5329 IS 6295 IS 10500 IS 9668 IS 5290

Also on InfraLens for NBC 2016

8Key values 4Tables 24QA/QC templates 1Handbook topics 4FAQs

BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.

Practical Notes

! Treat Part 9 per-capita demand numbers as the starting point; actual design should be validated against CPHEEO Water Supply Manual figures for the project's context (urban, semi-urban, rural).

! Minimum fixture counts in Part 9 are often superseded by state Bye-Laws and occupancy-specific regulations (schools under RTE, hospitals under NABH). Apply the stricter count.

! Rainwater harvesting provisions in Part 9 are now enforced by most state Bye-Laws for plots above a threshold size. Plot-specific RWH designs need percolation pit/recharge well sizing per CGWB guidelines.

! For gas supply (Section 2), engage the PNG distributor's approved contractor and meet PESO / PNGRB rules — these take precedence over Part 9 for commissioning and safety clearance.

Frequently referenced clauses

Section 1 - Water Supply, Drainage and Sanitation Section 2 - Gas Supply (LPG and PNG distribution inside premises)Water demand estimation by occupancy Pipe sizing and hydraulic design Fixture unit method for drainage Minimum number of sanitary fixtures by occupancy Rainwater harvesting and roof drainage Solid waste management within premises

water supplydrainagesanitationplumbing fixturesgas supplyLPGPNGsolid waste

International Equivalents

Similar International Standards

NFPA 101:2024NFPA (US)

HighCurrent

Life Safety Code

Both provide comprehensive requirements for life safety from fire, including egress, features of fire protection, and building services.

IBC 2024ICC (US)

HighCurrent

International Building Code

Both are broad building codes with extensive chapters on fire resistance, means of egress, fire protection systems, and occupancy classification.

BS 9999:2017BSI (UK)

MediumCurrent

Fire safety in the design, management and use of buildings — Code of practice

Both address fire safety design, but BS 9999 provides a more flexible, risk-based approach versus the largely prescriptive nature of the NBC.

BCA 2022ABCB (Australia)

MediumCurrent

Building Code of Australia (National Construction Code Volume One)

Both are national building codes covering fire safety, but differ in climate-specific considerations and classification systems.

Key Differences

≠The threshold for a building to be defined as 'High-Rise' is significantly lower in the NBC (15 meters) compared to the IBC (75 feet / ~23 meters). This subjects a much wider range of mid-rise buildings in India to stringent high-rise requirements like mandatory refuge areas and specific staircase provisions.

≠NBC 2016 places a strong emphasis on providing 'Areas of Refuge' at regular vertical intervals (e.g., every 15m above 24m) in high-rise buildings. This is a prescriptive requirement that is not typically found in US codes like the IBC or NFPA 101, which instead focus on protected egress routes, occupant evacuation elevators, or other performance-based solutions.

≠While both codes have detailed occupancy classifications, the grouping and terminology differ. For example, NBC's 'Group A - Residential' is sub-divided into five categories, which may not directly map to the 'R' (Residential) classifications in the IBC, leading to different requirements for buildings that seem similar.

≠NBC 2016 contains specific prescriptive requirements for external staircases as a second means of egress in certain building types, a practice less common in international codes which tend to focus on protected internal stairwells. The design and acceptance of external stairs under codes like NFPA 101 have different criteria.

Key Similarities

≈Both the NBC and its international counterparts (NFPA 101, IBC) are fundamentally structured around occupancy classification. The fire and life safety requirements are tailored based on the risks associated with the building's use (e.g., residential, institutional, assembly).

≈All codes mandate a balanced approach to fire safety, relying on a combination of passive protection (e.g., fire-rated walls and doors to compartmentalize fire) and active systems (e.g., sprinklers, fire alarms, smoke detectors) to ensure occupant safety and limit fire spread.

≈The core concept of 'Means of Egress' is central to all codes, with detailed requirements for its three components: Exit Access (e.g., corridors), the Exit itself (e.g., a protected stairwell), and the Exit Discharge (e.g., a door to the outside). Regulations on travel distance, exit capacity, and number of exits are common to all.

≈For high-rise buildings, both the NBC and international standards like the IBC require a minimum 2-hour fire resistance rating for primary structural elements and exit enclosures, recognizing the increased risk and evacuation time.

Parameter Comparison

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

⚠ Verify details from original standards before use

Key Values8

Quick Reference Values

water demand residential135-200 lpcd (with flushing)

water demand office45 lpcd

water demand hospital340 lpcd (with laundry and kitchen)

wc office male1 WC per 25 persons

wc office female1 WC per 15 persons

urinal office male1 per 25 persons

fire hydrant referenceIS 5290

water supply pipe referenceIS 1742 (Indian Standard Code of Practice for Building Drainage)

Tables & Referenced Sections

Key Tables

Table - Per Capita Water Demand by Building Type

Table - Minimum Sanitary Fixtures by Occupancy

Table - Drainage Fixture Units

Table - Pipe Sizing by Demand Load

Key Clauses

Section 1 - Water Supply, Drainage and Sanitation

Section 2 - Gas Supply (LPG and PNG distribution inside premises)

Water demand estimation by occupancy

Pipe sizing and hydraulic design

Fixture unit method for drainage

Minimum number of sanitary fixtures by occupancy

Rainwater harvesting and roof drainage

Solid waste management within premises

Frequently Asked Questions4

What is the minimum number of WCs in an office?+

Typically 1 WC per 25 males and 1 WC per 15 females, with urinals at 1 per 25 males. State Bye-Laws may be stricter.

What per-capita water demand is used for high-end residential?+

Part 9 gives 135 lpcd without flushing and ~200 lpcd with flushing; actual luxury or serviced-apartment projects often design at 250-300 lpcd.

Is rainwater harvesting mandatory under NBC?+

Part 9 provides the framework; enforceability comes from state Bye-Laws, most of which now require RWH for plots above 100-300 sqm.

Does Part 9 cover sewage treatment plants?+

It addresses onsite treatment in outline; detailed STP sizing and process selection follow CPHEEO Sewerage and Sewage Treatment Manual and CPCB norms.

QA/QC Inspection Templates

Code-Specific Templates for NBC 2016

Overview

International Equivalents

Key Values8

Tables & Referenced Sections

Related Resources on InfraLens

Frequently Asked Questions4

QA/QC Inspection Templates

Overview

International Equivalents

Key Values8

Tables & Referenced Sections

Related Resources on InfraLens

Frequently Asked Questions4

QA/QC Inspection Templates