Régie du bâtiment du Québec

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Searching for a contractor or a licence number: consult the Licence holders' repertory.

According to our language policy​​​​​​​, only certain contents may be translated. Visit the French version to obtain all the information.

Determining the required licence

List of subclasses


15.5 Contractor – Plumbing

This subclass authorizes construction work that is the exclusive domain of master pipe mechanics under the Master Pipe Mechanics Act (CQLR, c. M-4) and relates to plumbing systems in any building or construction, including piping and all accessories used for drainage or draining, for the back air vent, for supplying hot or cold water or gas. 

It also authorizes construction work included in subclass15.5.1.

Finally, it also authorizes related construction work.

Additional explanations

Section for contractors

Since November 19, 2001, the “Corporation des maîtres mécaniciens en tuyauterie du Québec” (CMMTQ — Québec Corporation of Master Pipe Mechanics) has been responsible for qualifying its members. It is therefore necessary to address this corporation for any question relating to the interpretation of this subclass.   

Qualification Department
Tel.: 514 382-2668
Toll-free: 1 800 465-2668
Website: www.cmmtq.org
Email: cmmtq@cmmtq.org

Section for owner-builders

Since the Master Pipe Mechanics Act (CQLR, c. M-4) does not apply to owner-builders, the content of this owner-builder subclass licence is significantly different from that of the contractor’s. For example, this subclass is appropriate for construction work on plumbing systems everywhere in Québec, without exception. 

This subclass authorizes, without exceeding the regulatory framework, construction work relating to:

  • work included in Chapter III of the Québec Construction Code and Chapter 1 of the Safety Code  
  • the installation of water meters
  • the installation of water treatment systems (softeners, filters, etc.)  
  • the installation of garburators
  • the installation of gas supply pipes
  • the installation of solar thermal collectors
  • the installation and replacement of water heaters (connection to the power source requires the applicable subclass)  
  • the installation of sump pumps.

Plumbing declaration

Whether or not they hold a licence, owner-builders are required to declare [Fr] any plumbing construction or renovation work. 


  • pipe thawing work
  • the cleaning of drains
  • work to flush hot and cold water pipes, as well as hot-water heaters and to pour antifreeze in the drains of various units connected to the plumbing system.  

If in doubt as to the applicable subclass, refer to the Keyword Index or contact us.

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