Revisions to the Building Code

The HTML version of the Building Code incorporates amendments made by regulation, as well as editorial corrections issued to the Code. The tables below provide a chronological record of these revisions and links to the corresponding changes.

Regulatory amendments are identified by the amending Ontario Regulation and its effective date. Editorial corrections are listed separately and identify corrections made to the published Code that do not constitute regulatory amendments.

Volume 2 regulatory amendments and editorial corrections

  • a1 – Ontario Regulation 447/24, effective January 1, 2025
  • a2 – Ontario Regulation 5/25, effective January 16, 2025
  • a3 – Ontario Regulation 110/26, effective April 20, 2026
  • a4 – Ontario Regulation 119/26, effective April 30, 2026
  • a5 – Ontario Regulation 242/26, effective July 17, 2026

Notes:

  1. For the exact location and wording of revisions, please refer to the applicable published PDF version of the Building Code or the official hard-copy publication.

The current HTML version of the Building Code reflects amendments up to and including O. Reg. 242/26 (July 22, 2026).

Table 1 - Regulatory Amendments and Editorial Corrections to the Volume 2 of the Building Code

Volume 2 Revision Marker Destinations a1
Type of Revision MarkerDestination of Marker
a1SA-1 3.1.6.9. Exterior Cladding
a1SA-1 3.2.2.18. Automatic Sprinkler System Required
a1SA-1 3.2.2.93. Encapsulated Mass Timber Construction, Various Occupancies, Heights and Areas, Sprinklered
a1SA-1 3.2.3.1. Limiting Distance and Area of Unprotected Openings
a1SA-1 3.2.3.6. Combustible Projections
a1SA-1 8.7.3.3. Absorption Trenches
a1SA-1 8.7.3.4. Distribution Pipe
a1SA-1 8.7.3.5. Leaching Chamber
a1Appendix A-1.1.1. Scope
a1Appendix A-3.1.6.6.(6) Protection of Gypsum Board from Foot Traffic
a1Appendix A-3.1.11.5.(3) and (4) Fire Blocks in Concealed Spaces
a1Appendix A-9.1.1.9. Factory-Built Buildings
a1SB-10 Foreword
a1SB-10 1.1.1.1. Application
a1SB-10 1.1.1.2. Reserved
a1SB-10 1.1.1.3. Energy Efficiency Design
a1SB-10 1.3.1.1. Determination of Climatic Zone Numbers
a1SB-10 1.3.1.2. Applicable Editions
a1SB-10 1.3.2.1. Abbreviations of Proper Names
a1SB-10 Division 2
a1SB-10 Energy Efficiency Design
a1SB-10 1.1.1. Reserved
a1SB-10 1.2.1.1. Exceptions
a1SB-10 Division 4
a1SB-10 1.1.1.1. Application
a1SB-10 Division 2 - Reserved
a1SB-10 Division 3 Chapter 1 Reserved
a1SB-10 Chapter 2 Reserved
a1SB-12 Foreword
a1SB-12 Chapter 2: Reserved
a1SB-12 Chapter 3: Acceptable Solutions for Achieving Energy Efficiency
a1SB-12 1.1.1.1. Energy Efficiency
a1SB-12 1.1.1.3. Compliance Options
a1SB-12 1.4.1.2. Referenced Documents
a1SB-12 Chapter 2
a1SB-12 Acceptable Solutions for Energy Efficiency Compliance
a1SB-12 Chapter 3: Acceptable Solutions for Achieving Energy Efficiency Compliance
Volume 2 Revision Marker Destinations a2
Type of Revision MarkerDestination of Marker
a2Appendix A-3.8.1.2. Barrier-Free Entrances
a2SB-3 Table 1 (Cont’d) Fire and Sound Resistance of Walls(1)
a2SB-12 1.3.1.2.(2) Defined Terms
Volume 2 Revision Marker Destinations a3
Type of Revision MarkerDestination of Marker
a3SA-1 Table 9 Objectives and Functional Statements Attributed to the Acceptable Solutions in Part 9 of Division B
a3Appendix A-3.1.6.6. Encapsulation Materials
a3Appendix A-3.8.2.1.(6) Residential Bathrooms
a3Appendix A-7.3.5.3.(1) Freeze Protection
a3Appendix A-9.5.2.4.(1) Stud Wall Reinforcement
a3Appendix A Table A-9.23.13. Application of Lateral Load Requirements
a3Appendix A-9.25.5.1.(1) Air and Vapour Permeance Values
a3SB-3 Table 2 (Cont'd) Fire and Sound Resistance of Floors, Ceilings and Roofs
a3SB-11 1.1.2. Construction Requirements