Gas code in Ontario
The fuel gas code edition in force in Ontario, with its effective date, the adopting authority and an official link. Factual adoption data only — confirm with your local AHJ.
CSA B149.1 (Natural Gas and Propane Installation Code) in force in Ontario
CSA B149.1:25 + Ontario amendments
- Effective
- June 1, 2026
- Verified
- June 28, 2026
TSSA Gaseous Fuels Code Adoption Document Amendment FS-279-26 adopts CSA B149.1:25 with Ontario amendments under O. Reg. 212/01, superseding the prior B149.1:20 adoption. CAD amendment published 2026-04-02 following consultation that closed 2026-01-19.
State/province adoption is the baseline. Your local building department may amend it or enforce a different edition — always confirm with the authority having jurisdiction (AHJ) before you design, bid or pull a permit.
Gas code in Ontario: what applies on your job
Ontario has adopted CSA B149.1:25 + Ontario amendments (Natural Gas and Propane Installation Code) with an effective date of June 1, 2026. The body responsible for adoption and enforcement is Technical Standards and Safety Authority (TSSA). This is the jurisdiction-wide baseline — your local building department may amend it or enforce a different edition, so confirm with the authority having jurisdiction before you design, bid or pull a permit.
TSSA Gaseous Fuels Code Adoption Document Amendment FS-279-26 adopts CSA B149.1:25 with Ontario amendments under O. Reg. 212/01, superseding the prior B149.1:20 adoption. CAD amendment published 2026-04-02 following consultation that closed 2026-01-19. The official code text is published by the standards body and is available by purchase or membership — use the official link above to read it. We link and cite the code; we do not reproduce it.
Frequently asked questions
Which fuel gas code edition is in force in Ontario?+
Ontario has adopted CSA B149.1:25 + Ontario amendments (Natural Gas and Propane Installation Code), effective June 1, 2026. The adopting authority is Technical Standards and Safety Authority (TSSA). Verified June 28, 2026.
Does Ontario amend the base code?+
TSSA Gaseous Fuels Code Adoption Document Amendment FS-279-26 adopts CSA B149.1:25 with Ontario amendments under O. Reg. 212/01, superseding the prior B149.1:20 adoption. CAD amendment published 2026-04-02 following consultation that closed 2026-01-19.
What does "edition in force" mean?+
It is the specific edition of a model code (for example CSA C22.1:24 or the 2020 National Building Code) that a province has legally adopted and currently enforces. Codes are republished on roughly three-year cycles, and each jurisdiction adopts a new edition on its own schedule — often with amendments — so the edition in force varies by place and by discipline.
Does the whole province use the same code?+
Not always. Many jurisdictions set a baseline edition for the whole province, but local building departments (the authority having jurisdiction, or AHJ) can amend it or enforce a different edition. Some places leave most adoption to local jurisdictions, and a few large cities run their own codes. Always confirm with your AHJ.
Which model codes does this directory track?+
The Canadian Electrical Code (CSA C22.1) for electrical, the National Building, Plumbing and Fire Codes of Canada and their provincial editions for building, plumbing and fire, and CSA B149.1 for gas.
How do I read the official code for free?+
The National Research Council publishes the national model codes — building, plumbing, fire and energy — as free downloads. CSA standards such as the Canadian Electrical Code and CSA B149.1 usually have to be bought, though some provinces give free read-only access through their own portals. Each result links to the official source.
Why does this directory not show the actual code text?+
Trade codes are copyrighted by their standards bodies (CSA Group and the National Research Council of Canada). This directory publishes only factual adoption data — which edition is in force, when it took effect, who the authority is, whether it is amended, and where to read it officially — and links you to the official source for the code text itself.
Methodology & sources
This record was verified against Technical Standards and Safety Authority (TSSA) and the relevant standards body on June 28, 2026, and is next due for review by December 31, 2026. We publish factual adoption data only — never code text.
- Official state/provincial adoption authorities + NFPA, ICC, IAPMO and CSA standards bodies — verified June 28, 2026
- Technical Standards and Safety Authority (TSSA) — TSSA Gaseous Fuels CAD Amendment FS-279-26 (tssa.org, published 2026-04-02) and TSSA 'Amendments to the Gaseous Fuels Code Adoption Document' confirm CSA B149.1:25 adoption with Ontario amendments under O. Reg. 212/01. CSA store lists '2026 Ontario CSA B149:25 code amendments'. Exact 2026-06-01 effective date could not be independently confirmed from public TSSA pages (CAD PDFs returned non-readable binary). — verified June 28, 2026
Last reviewed June 28, 2026. Estimates are indicative — verify against current product specs and local requirements before ordering.
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