2024 Ontario Building Code Guide: Group D and E Construction Requirements
Sarah's Expert Insight
OBC Compliance Specialist
"Navigating the trade-offs between sprinkler installation and building area is a critical decision for developers in London and Oakville to maximize ROI. At empcontracting.ca Inc. your construction contractor in London, Ontario, we often find that upgrading to a sprinklered system under Section 3.2.2.65 provides the necessary flexibility for future-proofing commercial office spaces while meeting the 2024 fire-resistance standards."
Understanding Group D and Group E Classifications under the OBC
Navigating the 2024 Building Code Compendium is essential for successful commercial developments. As your expert partners at empcontracting.ca Inc. your construction contractor in London, Ontario, we specialize in translating these technical requirements into high-quality builds.
3.2.2.64. & 3.2.2.65. Group D: Business and Personal Services (Up to 2 Storeys)
For Group D buildings up to two storeys, the Ontario Building Code (OBC) establishes maximum building areas based on street access. In non-sprinklered scenarios, a two-storey building facing one street is limited to 800 m², whereas facing three streets increases that limit to 1,200 m². These structures permit both combustible and noncombustible construction, provided floor assemblies and loadbearing elements maintain a fire-resistance rating of at least 45 minutes.
Sprinklered Group D Advantages
Under Section 3.2.2.65, introducing a sprinkler system significantly expands your development potential. A 2-storey sprinklered Group D building can reach a building area of up to 2,400 m², doubling the capacity of its non-sprinklered counterparts while maintaining the same 45-minute fire-resistance ratings for structural elements.
Group E Occupancies: Mercantile and Retail Requirements
3.2.2.66. Any Height, Any Area (Sprinklered)
Major retail developments classified as Group E generally require noncombustible construction and must be sprinklered throughout. These high-density spaces demand rigorous safety standards, including floor assemblies with a fire-resistance rating of no less than 2 hours and mezzanines rated for at least 1 hour.
3.2.2.67. Group E up to 4 Storeys (Sprinklered)
For mid-sized retail projects, the OBC allows for buildings up to 4 storeys with a maximum area of 1,800 m². These projects must be sprinklered throughout to ensure compliance with provincial fire safety standards, protecting both the investment and the public.
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.