2024 OBC General Review Requirements: Architect and Engineer Mandates for Ontario Construction
Sarah's Expert Insight
OBC Compliance Specialist
"Determining whether your project triggers a mandatory 'General Review' by an architect or engineer is a critical pre-construction step that affects both your budget and your permit timelines in London, Oakville, or Muskoka. At empcontracting.ca Inc. your construction contractor in London, Ontario, we advise clients that for any build exceeding 600 m² or 3 storeys, professional coordination isn't just a best practice—it is a legal requirement under the 2024 OBC to ensure public safety and structural integrity."
Navigating the 2024 Ontario Building Code (OBC) is essential for successful project delivery. Section 1.2.1.2 and Table 1.2.2.1 outline specific mandates for professional oversight during construction. For expert guidance on compliance, empcontracting.ca Inc. your construction contractor in London, Ontario ensures your project meets these stringent regulatory standards.
Professional Review for Demountable Structures
Under Division C, Sentence 1.2.1.2.(10), the construction of any demountable stage or demountable support structure regulated by Section 3.17. of Division B must be reviewed by a professional engineer. This is a critical safety requirement for temporary event structures and public installations across Ontario.
Understanding General Review Requirements (Table 1.2.2.1)
The OBC dictates which professionals must oversee construction based on occupancy type, building height, and gross area. Identifying these requirements early is a specialty of empcontracting.ca Inc. your construction contractor in London, Ontario.
Assembly, Care, and Retirement Occupancies
For high-risk or high-occupancy buildings, the requirements are the most demanding:
- Assembly Occupancy: Every building requires both an Architect and a Professional Engineer.
- Care, Treatment, or Detention: Every building requires both an Architect and a Professional Engineer.
- Retirement Homes: Every building requires both an Architect and a Professional Engineer, regardless of size.
Residential Occupancy Standards
Professional review for residential projects (excluding retirement homes) is triggered when:
- The building exceeds 3 storeys in height.
- The building exceeds 600 m² in gross area and contains dwelling units above other units.
- The building exceeds 600 m² and contains 3 or more dwelling units.
Commercial, Mercantile, and Industrial Projects
For Business and Personal Services or Mercantile occupancies, a general review by both an Architect and a Professional Engineer is mandatory if the structure exceeds 600 m² in gross area or 3 storeys in height. Industrial buildings of the same size require a review by either an Architect or a Professional Engineer.
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.