2024 Ontario Building Code: Plumbing Fixture Requirements for Business and Mercantile Occupancies in London
Sarah's Expert Insight
OBC Compliance Specialist
"As a senior consultant at empcontracting.ca Inc., your construction contractor in London, Ontario, I frequently see retail owners in areas like Oakville and Muskoka overlook the specific 1:150 female-to-fixture ratio for public spaces. Early planning for these plumbing counts is critical to avoid layout changes during the high-stakes inspection phase of a commercial fit-out."
Understanding Plumbing Standards for Commercial Construction
When planning a commercial renovation or new build, adhering to the 2024 Ontario Building Code (OBC) is essential for permit approval and occupant safety. As empcontracting.ca Inc. your construction contractor in London, Ontario, we ensure your project meets all Part 3 requirements for plumbing fixtures in business and mercantile settings.
3.7.4.7. Plumbing Fixtures for Business and Personal Services (Group D)
For offices and personal service shops, the number of water closets must follow Table 3.7.4.7 based on the number of persons of each sex. However, there is a significant exception: if the occupant load is 10 persons or fewer, a single water closet can serve both sexes.
- Up to 9 persons: 1 water closet
- 10 to 24 persons: 2 water closets
- Over 100 persons: 6 plus 1 for each additional 30 persons
3.7.4.8. Plumbing Fixtures for Mercantile Occupancies (Group E)
Retail and mercantile spaces require distinct calculations for employees and the public. Under Section 3.7.4.8, employee requirements mirror the business occupancy table, while public requirements are calculated at a ratio of one fixture per 300 males and one per 150 females.
Key Exceptions for Retail Spaces
If your mercantile occupancy is 600 m² or less (excluding the basement), the OBC allows for a minimum of only one water closet per sex. Furthermore, employee water closets can be counted toward the public requirement if they are made accessible to customers.
Worker Housing Requirements
For projects involving worker housing camps, the code mandates at least one shower or bathing area and specific laundry provisions—one washing machine or laundry tub for every 15 beds.
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.