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.

Regulatory amendments

  • R1 – Ontario Regulation 447/24, effective January 1, 2025
  • R2 – Ontario Regulation 5/25, effective January 16, 2025
  • R3 – Ontario Regulation 110/26, effective April 20, 2026
  • R4 – Ontario Regulation 119/26, effective April 30, 2026
  • R5 – Ontario Regulation 242/26, effective July 17, 2026

Editorial corrections

  • E1 – Editorial correction issued January 1, 2025
  • E2 – Editorial correction issued January 16, 2025
  • E3 – Editorial correction issued April 20, 2026
  • E4 – Editorial correction issued July 17, 2026

Notes:

  1. Unless otherwise indicated, all revision hyperlinks refer to changes in Division B of the Building Code.
  2. 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 to the Building Code

Volume 1 Revision Marker Destinations R1
Type of revision markerDestination of Marker
R1Division A 1.4.1.2. Defined Terms
R1Division A Table 1.3.1.2. Documents Referenced in the Building Code - Forming Part of Sentence 1.3.1.2.(1)
R12.2.1.17. Occupant Load
R1Notes to Table 3.1.3.1.
R13.1.6.4. Encapsulation of Mass Timber Elements
R13.1.6.6. Encapsulation Materials
R13.1.6.9. Exterior Cladding
R13.1.6.10. Combustible Components in Exterior Walls
R13.1.6.14. Combustible Interior Finishes
R13.1.7.5. Rating of Supporting Construction
R13.1.11.5. Fire Blocks in Horizontal Concealed Spaces
R13.1.15.2. Roof Coverings
R13.2.1.4. Floor Assembly Over Basement
R13.2.1.6. Mezzanines
R13.2.2.2. Special and Unusual Structures
R13.2.2.6. Multiple Major Occupancies
R13.2.2.7. Superimposed Major Occupancies
R13.2.2.11. Exterior Balconies
R13.2.2.12. Exterior Passageways
R13.2.2.13. Occupancy on Roof
R13.2.2.14. Rooftop Enclosures
R13.2.2.16. Heavy Timber Roof Permitted
R13.2.2.18. Automatic Sprinkler System Required
R13.2.2.19. Buildings Containing Impeded Egress Zones
R13.2.2.23. Group A, Division 2, Any Height, Any Area, Sprinklered
R13.2.2.42. Group B, Division 3, Any Height, Any Area, Sprinklered
R13.2.2.47. Group C, Any Height, Any Area, Sprinklered
R13.2.2.48. Group C, up to 12 Storeys, Sprinklered, Encapsulated Mass Timber Construction
R13.2.2.56. Group D, Any Height, Any Area, Sprinklered
R13.2.2.57. Group D, up to 12 Storeys, Sprinklered, Encapsulated Mass Timber Construction
R13.2.2.66. Group E, Any Height, Any Area, Sprinklered
R13.2.2.76. Group F, Division 2, Any Height, Any Area, Sprinklered
R13.2.2.82. Group F, Division 3, Any Height, Any Area, Sprinklered
R13.2.2.93. Encapsulated Mass Timber Construction, Various Occupancies, Heights and Areas, Sprinklered
R1Notes to Table 3.2.3.7.
R13.2.3.9. Protection of Structural Members
R13.2.5.12. Automatic Sprinkler Systems
R13.2.6.1. Application
R13.3.3.7. Contained Use Areas
R13.8.3.18. Tactile Attention Indicators
R13.14.2.2. General
R14.4.5.1. Anchor Systems on Building Exterior
R16.3.2.14. Cleaning Devices
R17.1.2.1. Sanitary Drainage Systems
R17.1.2.2. Storm Drainage Systems
R17.1.2.3. Water Distribution Systems
R17.2.5.7. PVC Pipe and Fittings
R17.2.10.7. Water Temperature Control
R17.2.10.7A. Temperature Control Devices
R17.6.1.8. Solar Domestic Hot Water Systems
R19.1.1.9. Site Assembled and Factory-Built Buildings
R19.13.4.2. Protection from Soil Gas Ingress
R19.21.2.4. Size of Chimney Flues
R1Table 9.23.3.4 . Nailing for Framing
R19.25.3.3. Continuity of the Air Barrier System
R19.33.4.1. Design of Heating and Air-Conditioning Systems
R110.2.1.3. Building Size and Construction
R111.2.1.1. Construction Index and Hazard Index
R1Table 11.5.1.1.-C Compliance Alternatives for Residential Occupancies
R1Division C 1.3.7. Temporary Health or Residential Facilities
Volume 1 Revision Marker Destinations R2
Type of revision markerDestination of Marker
R29.9.4.4. Openings Near Unenclosed Exterior Exit Stairs and Ramps
R2Division C 1.7.1.1. General
R2Division C 3.1.2.2. Registration and Renewal of a Registration
R2Division C 3.1.3.2. Registration and Renewal of a Registration
R2Division C 3.1.4.2. Registration and Renewal of a Registration
R2Division C Table 3.5.2.1. Classes of Registration and Categories of Qualifications for Inspectors and Persons Who Carry Out Design Activities
Volume 1 Revision Marker Destinations R3
Type of revision markerDestination of Marker
R3Preface - Part 4 Future Amendments and Commencement
R3Division A 1.4.1.2. Defined Terms
R31.3.1.1. Effective Date
R3Table 1.3.1.2. Documents Referenced in the Building Code
R33.3.1.8. Headroom and Protruding Objects
R33.13.3.3. Service Rooms and Ancillary Spaces
R38.7.3.5. Leaching Chamber
R3Division C 1.3.3.1. Occupancy Permit — General
R3Division C 1.3.3.2. Conditions for Residential Occupancy
R3Division C 1.3.3.4. Occupancy Permit — Certain Buildings of Residential Occupancy
R3Division C 1.3.3.5. Occupancy Permit — Buildings Within the Scope of Article 3.2.2.51. or 3.2.2.60.
R3Division C 1.3.3.6. Occupancy Permit — Buildings in the Lower Don Area of Toronto
R3Division C 1.3.3.7. Occupancy Permit — Super Tall Buildings
R3Division C 1.3.3.8. Occupancy Permit — Deferred Development Charges
R3Division C 1.3.5.1. Prescribed Notices
R3Division C 1.3.5.3. Prescribed Inspections
R3Division C 1.7.1.1. General
R3Division C 2.3.0.1. Definition
R3Division C 2.3.1.1. Application Fee
R3Division C Part 4 - Future Amendments and Commencement
Volume 1 Revision Marker Destinations R4
Type of revision markerDestination of Marker
R4Table 1.3.1.2. Documents Referenced in the Building Code
R4Table 1.3.2.1. Abbreviations of Proper Names
R4Division C 1.3.3.6. Occupancy Permit — Buildings in the Lower Don Area of Toronto
R4Division C 1.3.3.6.A Occupancy Permit — Buildings in Downtown Brampton Special Policy Area 3E
Volume 1 Revision Marker Destinations R5
Type of revision markerDestination of Marker
R5Table 1.3.1.2. Documents Referenced in the Building Code
R5Section 3.19. Four-Storey Row House
R57.2.5.16. Cellular Core PVC Pipe and Fittings
R5Division C Table 1.7.1.1. Enforcement of the provisions of the Act and this Code Related to Sewage Systems
R5Division C Part 4 - Future Amendments and Commencement

Table 2 - Editorial Corrections to the Building Code

Volume 1 Revision Marker Destinations E1
Type of revision markerDestination of Marker
E1Division A 1.1.1.1. Application of this Code
E1Division A 1.4.1.2. Defined Terms
E1Division A 1.4.1.3. Definition of Applicable Law
E1Table 1.3.1.2. Documents Referenced in the Building Code
E12.2.5.1. Minimum Lighting Requirements
E13.2.3. Spatial Separation and Exposure Protection
E13.1.2.3. Arena-Type Buildings
E13.2.2.48. Group C, up to 12 Storeys, Sprinklered, Encapsulated Mass Timber Construction
E13.2.2.57. Group D, up to 12 Storeys, Sprinklered, Encapsulated Mass Timber Construction
E13.2.4.18. Audibility of Alarm Systems
E13.3.1.13. Doors and Door Hardware
E13.8.2.1. Areas Requiring Barrier-Free Path of Travel
E13.12.2.1. Construction Requirements
E14.1.8.16. Foundation Provisions
E16.3.1.1. Required Ventilation
E1Part 8
E18.7.3.2. Length of Leaching Chamber
E19.10.9.16. Separation of Residential Suites
E19.10.9.17. Separation of Public Corridors
E19.10.10.4. Locations of Fuel-Fired Appliances
E19.24.3.7. Openings for Fire Dampers
E1Table 11.5.1.1.-C Compliance Alternatives for Residential Occupancies
E1Division C 1.4.1. Forms
E1Division C 1.8.1.1. Language Used on Required Signs
E1Division C 2.4.2.1. Criteria
E1Division C Table 3.5.2.2. Classes of Registration and Categories of Qualifications for Registered Code Agencies
E1Index
Volume 1 Revision Marker Destinations E2
Type of revision markerDestination of Marker
E2Notes to Table 3.1.3.1. Separation of Major Occupancies
E2Table 3.1.6.3 . — Minimum Dimensions of Structural Mass Timber Elements in Encapsulated Mass Timber Construction Forming Part of Sentences 3.1.6.3.(2) , 3.1.6.8.(1) and 3.1.6.17.(1)
E23.1.6.9. Exterior Cladding
E23.1.15.2. Roof Coverings
E23.2.4.7. Signals to Fire Department
E23.2.4.18. Audibility of Alarm Systems
E23.2.8.2. Exceptions to Special Protection
E23.3.1.5. Egress Doorways
E23.3.1.9. Corridors
E23.4.5.1. Exit Signage
E27.1.0. Scope
E27.1.0. Scope
E29.6.1.2. Material Standards for Glass
E29.7.2.3. Minimum Window Areas
E29.10.9.4. Floor Assemblies
E29.10.11.1. Required Firewalls
E29.10.15.5. Construction of Exposing Building Face of Houses
E29.33.5.2. Installation Standards
E210.3.1.1. General
E2Table 11.5.1.1.-C Compliance Alternatives for Residential Occupancies
E2Division C 1.3.1.7. Information to be Given to the Fire Chief or Clerk
Volume 1 Revision Marker Destinations E3
Type of revision markerDestination of Marker
E3Division A 1.4.1.2. Defined Terms
E3Division A 1.4.1.3. Definition of Applicable Law
E33.2.3.7. Construction of Exposing Building Face
E33.2.4.1. Determination of Requirement for a Fire Alarm System
E33.2.4.22. Two-Way Voice Communication Systems
E33.2.6.3. Connected Buildings
E33.3.1.13. Doors and Door Hardware
E33.4.2.2. Means of Egress from Mezzanines
E33.4.6.11. Doors
E33.4.6.16. Door Release Hardware
E33.8.3.4. Ramps
E33.12.3.2. Access into Public Spas
E36.2.1.5. Installation Standards
E36.3.2.9. Supply, Return, Intake and Exhaust Air Openings
E36.3.4.2.A. Power-Ventilated Enclosure
E36.9.3.4. Installation and Conformance to Standards
E38.6.2.2. Other Treatment Units
E39.1.1.7. Radon
E3Note to Table 9.6.1.3.-F Maximum Glass Area for Windows in Areas for which the 1-in-50 Hourly Wind Pressure (HWP) is Less than 1.00 kPa –
E39.9.6.7. Door Latching, Locking and Opening Mechanisms
E39.9.9.3. Shared Egress Facilities
E39.10.20.1. Windows or Access Panels Required
E39.23.6.1. Anchorage of Building Frames
E39.31.1.1. Application
E39.41.2.1. Change of Use and Compensating Construction
E3Table 9.23.4.2.-A Maximum Spans for Floor Joists – General Cases
E3Table 9.23.4.2.-B Maximum Spans for Floor Joists – Special Cases
E3Table 9.23.4.2.-C Maximum Spans for Ceiling Joists – Attic Not Accessible by a Stairway
E3Table 9.23.4.2.-D Maximum Spans for Roof Joists – Specified Roof Snow Loads 1.0 to 2.0 kPa
E3Table 9.23.4.2.-E Maximum Spans for Roof Joists – Specified Roof Snow Loads 2.5 and 3.0 kPa
E3Table 9.23.4.2.-F Maximum Spans for Roof Rafters – Specified Roof Snow Loads 1.0 to 2.0 kPa
E3Table 9.23.4.2.-G Maximum Spans for Roof Rafters – Specified Roof Snow Loads 2.5 and 3.0 kPa
E3Table 9.23.4.2.-H Maximum Spans for Built-up Floor Beams Supporting Not More than One Floor
E3Table 9.23.4.2.-I Maximum Spans for Built-up Floor Beams Supporting Not More than Two Floors
E3Table 9.23.4.2.-J Maximum Spans for Built-up Floor Beams Supporting Not More than Three Floors
E3Table 9.23.4.2.-K Maximum Spans for Glue-Laminated Floor Beams – 20f-E Grade
E3Table 9.23.4.2.-L Maximum Spans for Built-up Ridge Beams and Lintels Supporting the Roof and Ceiling Only – No. 1 or No. 2 Grade
E3Table 9.23.12.3.-A Maximum Spans for Douglas Fir – Larch Lintels – No. 1 or No. 2 Grade – Non-Structural Sheathing
E3Table 9.23.12.3.-B Maximum Spans for Hem – Fir Lintels – No. 1 or No. 2 Grade – Non-Structural Sheathing
E3Table 9.23.12.3.-C Maximum Spans for Spruce – Pine – Fir Lintels – No. 1 or No. 2 Grade – Non-Structural Sheathing
E3Table 9.23.12.3.-D Maximum Spans for Glued-Laminated Timber Lintels – 20f-E Stress Grade – Exterior Walls – Roof and Ceiling Load Only
E3Table 11.5.1.1.-C Compliance Alternatives for Residential Occupancies