Ontario Building Code Reference
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Common Starting Points
Part 3 — Fire Protection
Occupancy classification, fire separations, suppression
Part 4 — Structural Design
Loads, foundations, structural requirements
Part 9 — Housing & Small Buildings
The most-referenced part for residential construction
Part 10 — Change of Use
Requirements when changing building occupancy
Supplementary Standards
SB-1 to SB-13 — technical reference standards
Amendment Tracker
All O. Reg. changes with official source links