Ontario Building Code 3.7.4.3: Water Closet Requirements for Commercial Occupancies
Sarah's Expert Insight
OBC Compliance Specialist
"In my experience with high-traffic commercial builds in London and Oakville, miscalculating occupant load is a frequent cause of permit delays. It is crucial to determine your maximum capacity early in the design phase, as the leap from 20 to 21 persons in a restaurant environment instantly doubles your required plumbing fixtures under Table 3.7.4.3.-D."
Understanding the 2024 Ontario Building Code (OBC) is vital for the successful execution of commercial construction projects. Whether you are developing a new restaurant or a community pool, empcontracting.ca Inc. your construction contractor in London, Ontario, provides the expertise needed to navigate these complex plumbing requirements.
Water Closet Requirements for Theatres and Assembly Occupancies
As per Section 3.7.4.3.(3) and Table 3.7.4.3.-C, specific ratios apply to motion picture theatres, Group A Division 3 and 4 occupancies, and outdoor pools. The minimum number of fixtures is determined by the occupant load of each sex:
- 1 to 50 Persons: 1 Water Closet
- 51 to 150 Persons: 2 Water Closets
- 151 to 250 Persons: 3 Water Closets
- 251 to 375 Persons: 4 Water Closets
- 376 to 500 Persons: 5 Water Closets
- Over 500 Persons: 6 plus 1 for each additional 150 persons
Plumbing Fixture Standards for Restaurants and Dining Facilities
Table 3.7.4.3.-D Overview
For dining rooms, cafeterias, and restaurants, the OBC mandates stricter fixture counts to ensure public health and comfort. empcontracting.ca Inc. your construction contractor in London, Ontario ensures your floor plan complies with these essential standards:
- 1 to 20 Persons: 1 Water Closet
- 21 to 70 Persons: 2 Water Closets
- 71 to 105 Persons: 3 Water Closets
- 106 to 135 Persons: 4 Water Closets
- Over 425 Persons: 12 plus 1 for each additional 50 persons
Establishments for Alcoholic Beverage Consumption
Section 3.7.4.3.(5) notes that establishments used primarily for alcohol consumption with limited food service must follow Table 3.7.4.3.-E, which often requires a different density of fixtures compared to standard dining rooms.
Disclaimer: This content is generated from the Ontario Building Code for educational purposes. Always consult with a licensed professional engineer or your local building department before starting any construction project in London, Ontario.