| Feature | Requirement (Typical Part 9 Residential) | |--------|--------------------------------------------| | Snow load | 1.5–3.5 kPa (regional) | | Wind load | 0.5–0.9 kPa | | Frost protection depth | 1.2 m min. | | Ceiling height | 2.1 m min. | | Egress window size | 0.35 m² min., 380 mm min. dimension | | Stair rise/run | 210 mm max / 210 mm min | | R-value (walls) | R-22 effective (RSI 3.85) | | Air leakage | ≤ 2.5 ACH @50 Pa | | Smoke alarms | Hardwired, interconnected | | Plumbing vent | ≥ 3" through roof | | Accessible door width | 850 mm (public buildings) |
: Specific rules apply to structures like retaining walls if they exceed one meter in height and are adjacent to public or specific private property. The 2024 OBC Update building codes ontario
The Code has become much stricter regarding energy efficiency (Part 12 of the OBC). New builds and major renovations must meet specific insulation values (R-values), window efficiency standards, and air-tightness requirements. | Feature | Requirement (Typical Part 9 Residential)
The OBC is a regulation under the Building Code Act . It sets the minimum standards for construction, renovation, and change of use of buildings. dimension | | Stair rise/run | 210 mm
: Changes affecting fire safety, such as requirements for specialized sprinkler systems in certain glazed assemblies.