: End of the grace period. Permit applications submitted after this date must comply strictly with the 2024 OBC. Applications before April 1, 2025
Since April 1, 2025, the 2024 OBC applies to every new complete permit submission.
Building permit applications were permitted to use the old 2012 OBC framework, provided the applicant could prove their working drawings and specifications were substantially completed on or before December 31, 2024.
Full, mandatory enforcement of the 2024 OBC applies to all new permit applications without exception. Key Regulatory Changes in the 2024 OBC ontario building code 2024
The new code structure is unique: the regulation itself is a concise one-page document that adopts the by reference, supplemented by a specific Ontario Amendment Document for provincial-only variations (such as accessibility and sewage systems). 3. Key Technical Changes by Category Housing and Secondary Suites (Part 9) The 2024 Ontario Building Code | ontario.ca
Introducing stricter requirements for fire protection and radon mitigation. Major Technical Changes The 2024 Ontario Building Code | ontario.ca
While harmonization was the primary goal, several technical updates have been introduced to address modern demands for density, climate resilience, and safety. 1. Increased Multi-Unit Residential Density : End of the grace period
Previously, the OBC was a standalone, two-volume document. The 2024 edition introduces a . It consists of:
The (OBC 2024) is a comprehensive regulatory update under the Building Code Act, 1992 . Officially adopted in late 2024 with phased implementation beginning January 1, 2025 , this new code represents the first major overhaul of Ontario’s building regulations since 2012 (Supplementary Standard SB-12 updates aside). The code aims to accelerate housing construction, reduce regulatory burden, improve energy efficiency, and align with national model codes (NBC 2020) while retaining provincial distinctions.
Changes to egress and firewall requirements make it easier and more cost-effective to construct triplexes, fourplexes, and low-rise apartment buildings. 2. Enhanced Fire and Structural Safety Building permit applications were permitted to use the
The 2024 OBC is a set of regulations governing the design, construction, and renovation of buildings across Ontario. It focuses on health, safety, fire protection, accessibility, and environmental efficiency. Its core objective is to ensure that all structures meet a high standard of safety while adapting to modern construction techniques and materials. Key Changes and Highlights 1. Enhanced Use of Mass Timber
The update focuses on reducing regulatory burdens and streamlining construction by eliminating over between provincial and national requirements. Key goals include:
: Contains the main administrative and technical regulations. 2024 Ontario Building Code Compendium (Vol 2)
All new permit applications must comply exclusively with the 2024 OBC.
