CSA B149.1-25 Quick Reference Guide

Introduction: Explains the purpose and intent of the code—establishing minimum requirements for safe installation of natural gas and propane appliances, equipment, and piping systems in Canada.
Scope: Outlines what is covered: residential, commercial, and industrial gas systems, piping, venting, appliances, vehicle fueling, and field testing. Specifies what is excluded (like appliance design).
What to Tab & Mark: Definitions of scope and applicability—helps you determine if a job falls under B149.1. Clauses listing exemptions and exceptions (e.g. what is not covered by the code).

Welcome to the interactive CSA B149.1-25 Reference Guide by LARK Labs.
Click any section or annex below for a detailed explanation of what it covers, plus expert tips on what to tab and flag in your codebook.

For full code text, Ontario regulations, and AI-powered code interpretation, download Code Compass (FREE Ontario Regulations, CSA B149.1-25 and B149.2-25 Sections 1-4. Premium subscription unlocks full code search and AI explanations).