2024 Ontario Building Code Guide: Stairs and Ramp Standards for London Construction
Sarah's Expert Insight
OBC Compliance Specialist
"As a senior consultant at empcontracting.ca Inc. your construction contractor in London, Ontario, I find that many homeowners in Oakville and Muskoka overlook the specific slope and rise limitations when adding secondary suites. Precisely following Section 9.8.5 ensures that your ramps remain safe during winter icing and that your property transitions meet the rigorous 2024 OBC safety benchmarks for inspections."
Understanding OBC Section 9.8: Stairs and Ramps
Navigating the 2024 Building Code Compendium is essential for any successful residential or industrial build. As empcontracting.ca Inc. your construction contractor in London, Ontario, we prioritize these safety standards to ensure your project is both compliant and durable.
9.8.4.9. Regulations for Open Risers
In general, stairs are required to have closed risers to prevent tripping hazards. However, open risers are permitted in specific scenarios including:
- Interior and exterior stairs serving a single dwelling unit or a house with a secondary suite.
- Fire escapes and stairs used for maintenance or service rooms.
- Industrial occupancies (excluding storage garages).
9.8.4.10. Protection from the Elements
Any interior stairway that extends through the roof of a building must be adequately protected from ice and snow accumulation to maintain safe passage during Ontario's harsh winters.
OBC 9.8.5. Design Standards for Pedestrian Ramps
Section 9.8.5 outlines the physical requirements for ramps that are not part of a barrier-free path of travel. For barrier-free requirements, Article 3.8.3.4 must be consulted.
Ramp Width and Headroom Clearances
The standard minimum width for a ramp is 1100 mm. However, for a single dwelling unit or a house with a secondary suite, the minimum width is reduced to 860 mm. Similarly, while standard clear height over a ramp must be 2050 mm, it can be reduced to 1950 mm for private residential units.
Slope and Maximum Rise Specifications
To ensure safety, the OBC dictates maximum slopes based on occupancy:
- Residential (Interior/Exterior): Maximum 1 in 10.
- Industrial: Maximum 1 in 6.
- Other Occupancies: Maximum 1 in 8.
Under Section 9.8.5.5, if a ramp's slope exceeds 1 in 12, the maximum vertical rise allowed between floors or landings is capped at 1500 mm.
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.