Plumber Incorporation in Quebec (2026): CMMTQ License, Articles of Incorporation and Costs
A self-employed plumber in Quebec must become a member of the CMMTQ and obtain a licence — and the choice of legal structure is made BEFORE the application, because changing your status afterward means redoing a complete application. Incorporated, the shareholder can also be an employee of their own corporation: a decisive advantage on the work you're allowed to perform.
CCQ registration, CNESST, the Revenu Québec compliance certificate: these obligations common to the sector are detailed in our guide to the construction contractor (RBQ licence). This page covers what is specific to plumbers: the CMMTQ. Economic activity code (CAE) to declare with the Registrar: generally in the 4241 to 4244 series depending on your specialty — see our CAE code search tool.
The CMMTQ: the mandatory step for self-employed plumbers
Since 2001, the Corporation des maîtres mécaniciens en tuyauterie du Québec (CMMTQ) has been the government's delegated authority for the professional qualification of plumbing and heating contractors. It is the CMMTQ — not the RBQ directly — that issues, amends, suspends and cancels licences in its subcategories, and that administers the exams.
This mandate flows from the Building Act and the Master Pipe Mechanics Act. Direct consequence: CMMTQ membership is mandatory — the admission form is submitted together with the licence application, in a single file.
The licence subcategories exclusive to the CMMTQ:
| Subcategory | Official label |
|---|---|
| 15.1 | Contractor — forced-air heating systems |
| 15.2 | Contractor — natural gas burner systems |
| 15.3 | Contractor — oil burner systems |
| 15.4 | Contractor — hydronic heating systems |
| 15.5 | Plumbing contractor |
Subcategory 15.5, the typical case for a plumber, covers potable water supply systems, sanitary drainage and its venting, storm drainage and plumbing fixtures. Watch the boundaries: French drains, hot-water heating systems and irrigation do not fall under plumbing for licensing purposes.
Step 2 first: choose your legal structure before the licence application
In the CMMTQ's official process, choosing your legal structure comes at step 2 — even before the licence application (step 3). The structure you choose determines your tax obligations, your personal liability and, as we'll see below, the work you'll be able to carry out.
Three structures are possible, each with its own application form: the sole proprietorship (NEQ starting with 22), the partnership (NEQ 33) and the legal person — the corporation — (NEQ 11). Our comparison of legal structures in Quebec explains the substantive differences.
And here is the rule that makes this choice so consequential: according to the RBQ, a change of legal status triggers a new NEQ, and therefore a whole new, complete licence application — even if you already hold one; the licence is not transferable. Starting out as a sole proprietorship "just to see" risks having to redo the entire process: application, surety bond, qualified officer file. Our guide When should you incorporate in Quebec? helps you decide — for a plumber, the decision is made before step 3.
Sole proprietorship or incorporated: what it changes on job sites (CCQ statuses)
Here is the most concrete argument in favor of incorporating as a plumber. On a job site subject to the R-20 Act, a person working alone as a sole proprietorship cannot be their own employee: they are a "self-employed contractor," limited to maintenance, repair and minor renovation. Incorporated, the shareholder can be an employee of their own corporation — and carry out all types of work.
The regulations recognize four statuses on covered job sites: employer, employee, self-employed contractor and designated representative. The status available to you depends directly on your legal structure:
| Your structure | Your status on a covered job site | Permitted work |
|---|---|---|
| Sole proprietorship (working alone) | Self-employed contractor — cannot be your own employee | Maintenance, repair and minor renovation only |
| Corporation | Employee of your own corporation (or designated representative, one per business) | All types of work, including new construction |
For a plumber targeting new construction, incorporation isn't just tax optimization — it's a condition of market access. Reminder: all these statuses require the CCQ competency certificate (journeyman pipefitter, or an exemption), and every construction business must register with the CCQ, whether or not it has employees — obligations detailed in our construction contractor guide.
The qualified officer: four exams and a 90-day rule
Your licence rests on a qualified officer, qualified for each area and each subcategory. For a corporation, this officer can be a director, a shareholder holding at least 10% of the voting rights, the president or a full-time manager. For a sole proprietorship, it is the owner.
Qualification requires four exams, with a passing grade of 60%:
- Administration (3 hours);
- Site safety management (1.5 hours);
- Project and site management (3 hours);
- Execution of work — plumbing 15.5 (3 hours).
Exemptions exist: completing a recognized training program or, exceptionally, an evaluation of a professional record. Note: a journeyman certificate does not automatically exempt you from the management exams.
One last point, often discovered too late: if your qualified officer leaves, you have 90 days to replace them (120 days in the event of death), failing which the licence ceases to have effect or the subcategory is withdrawn. Qualifying a second officer is inexpensive insurance.
Gas heating: the 15.5 is not enough
Work on a natural gas installation requires subcategory 15.2: the 15.5 licence does not cover it. All work relating to a gas installation must be entrusted to a specialized contractor who is a member of the CMMTQ. On the workers' side, Emploi-Québec qualification certificates are also required:
- TAG-3N (natural gas appliances of 120 kW or less): a minimum of 1,300 hours of apprenticeship, mandatory training and an exam;
- ITG (gas piping installation only): available in particular to holders of a CCQ journeyman plumber certificate.
The other classes (TAG-1 to TAG-4, TERAG) are described on the Québec.ca gas sector certifications page.
Worth watching: on February 25, 2026, the CMMTQ announced a draft regulation — currently in consultation only — that would refocus subcategories 15.1 and 15.4 on heating and shift combustion work to the burner subcategories. "No change applies for the time being," the CMMTQ states.
The 12 steps of the CMMTQ process, condensed
The official process for becoming a plumbing contractor has 12 steps. The point that concerns us here: your legal structure is decided at step 2, right at the start — well before the exams.
- Assess your business project;
- Choose your legal structure and register the business — this is where incorporation is decided, because a later change means a whole new, complete licence application;
- Complete the licence application (the form differs depending on the legal status chosen);
- Complete the CMMTQ admission application (submitted at the same time; a corporation attaches a resolution naming its designated representative);
- Provide the $20,000 licence surety bond (CMMTQ group policy: $55/year premium);
- Send in the documents and payments;
- Take the four exams (you're called in a few weeks after your file is received), unless exempted;
- Register with the CCQ;
- Register with the CNESST;
- Open your GST/QST accounts — see our guide to tax numbers;
- Open your source deductions account — including for yourself, once incorporated;
- Take out the appropriate insurance — including liability insurance, essential for a plumber.
After admission, you have 60 days to identify your advertising, documents and vehicles. For the corporation part (step 2), our steps to incorporate page details the process with the Registrar.
Your corporation ready for step 2 — $497 all-in
Articles of incorporation prepared and verified, initial declaration, numbered company and the $397 government fee included. A form of about 20 minutes, filed directly with the Registrar — and your "11" NEQ in hand before you complete the CMMTQ licence application.
How much does it cost to start a plumbing business in 2026?
Plan on $849.41 for issuance of the specialized licence, $881 + taxes for CMMTQ admission, $29.30 per subcategory and $55/year in surety bond premium — plus, for the corporation, $397 in government fees ($497 all-in with Incorp-Québec) and $106 in annual rights.
| Item (2026 amounts) | Amount |
|---|---|
| Licence issuance — specialized category (typical case: 15.5) | $849.41 |
| Annual maintenance of the specialized licence (recurring) | $547.53 |
| CMMTQ admission (period from February 1, 2026 to January 31, 2027) | $881 + taxes |
| Fee per subcategory (CMMTQ) | $29.30 each, before taxes |
| Licence surety bond (specialized category) | $20,000 — $55/year premium via the CMMTQ group policy |
| Incorporation: certificate of incorporation (Registrar) | $397 — included in our packages |
| Incorp-Québec — Essential (numbered company, articles, initial declaration, government fees included) | $497 all-in |
| Incorp-Québec — Complete (+ official name, GST/QST and source deduction registrations, express service) | $697 all-in |
| Annual rights to the Registrar (recurring) | $106 per year |
Honest note: the $881 is the admission fee — the annual membership fee is added afterward (the amount is communicated by the CMMTQ to its members) — and these amounts are adjusted every January 1. The corporation side is detailed in our incorporation costs guide and on our page incorporating in Quebec online.
Water damage: why the surety bond doesn't protect you
The plumber's typical claim is water damage — and that is precisely what the surety bond does not cover. The $20,000 surety bond compensates your clients (lost deposits, unfinished work, defects discovered within the year) but excludes third-party claims, delays, and moral or punitive damages.
A recent case illustrates the scale of the risk: in a ruling dated May 9, 2025, the Quebec Court of Appeal held a subcontractor plumber solidarily liable, along with the developer, for water damage that occurred in 2018 in a Montreal condominium — a non-compliant installation of an air-conditioning tank-pipe connection. The bill: $32,277.18 in corrective work, plus a $5,000 deductible, with interest. Seven years after the incident.
The lesson is twofold. First, liability insurance: the RBQ requires the surety bond, but liability insurance is the contractor's own responsibility — the CMMTQ places it at step 12 of its process. Second, separation of assets: a corporation keeps the business's assets separate from your personal assets. It is not an absolute shield, and nothing replaces good insurance coverage, but it is a protection that a sole proprietorship does not offer.
Pitfalls to avoid
Five documented mistakes that cost start-up plumbers dearly:
- Incorporating after already obtaining your licence as a sole proprietorship: a new NEQ means a whole new, complete licence application — the licence is not transferable. Decide your structure at step 2, not afterward.
- Staying a sole proprietorship while targeting new construction: working alone, you are a self-employed contractor, limited to maintenance, repair and minor renovation on covered job sites.
- Assuming the 15.5 covers gas: gas installations require the 15.2, and your workers must hold the Emploi-Québec certificates (TAG-3N, ITG).
- Neglecting succession for your qualified officer: their departure starts a 90-day countdown before the licence lapses.
- Confusing the surety bond with insurance: the $20,000 does not cover water damage at a third party's property — the 2025 ruling cited above is a stark reminder.
Once your corporation is set up, also think about the administrative foundations: business bank account, minute book and obligations to the Business Register.
FAQ — Plumber incorporation in Quebec
Do I have to be a member of the CMMTQ to start my plumbing business?
Yes. Since 2001, the CMMTQ has been the Quebec government's delegated authority for the qualification of plumbing and heating contractors: it issues licences for its exclusive subcategories (15.1 to 15.5), and membership is mandatory — the admission form is submitted together with the licence application.
Can I start as a sole proprietorship and incorporate later?
Yes, but a change of legal status creates a new NEQ and requires filing a whole new, complete licence application: the licence is not transferable. That's why the choice of legal structure is made at step 2 of the CMMTQ process, before the licence application.
Why does incorporating change the work I'm allowed to carry out?
On a job site subject to the R-20 Act, a plumber working alone as a sole proprietorship cannot be their own employee: they are a "self-employed contractor," limited to maintenance, repair and minor renovation. Incorporated, the shareholder can be an employee of their own corporation and carry out all types of work, including new construction.
Who can serve as the qualified officer for my corporation?
A director, a shareholder holding at least 10% of the voting rights, the president, or a full-time manager. The qualified officer must pass four exams (60% passing grade) or obtain an exemption; if they leave, you have 90 days to replace them (120 days in the event of death), otherwise the licence ceases to have effect.
How much does it cost to start a plumbing business in 2026?
On the licence side: $849.41 for issuance (specialized category), $881 + taxes for CMMTQ admission, $29.30 per subcategory and a $55 per year surety bond premium; annual maintenance then costs $547.53. On the corporation side: $397 in government fees, or $497 all-in with Incorp-Québec, then $106 in annual rights.
Does my 15.5 licence allow me to do gas work?
No. Work on a gas installation requires subcategory 15.2 (natural gas), and workers must hold the appropriate Emploi-Québec certificates — TAG-3N for appliances of 120 kW or less (a minimum of 1,300 hours of apprenticeship) or ITG for gas piping installation only.
What does the $20,000 surety bond cover?
It compensates your clients for lost deposits, unfinished work and defects discovered within the year. It does not cover third-party claims — like water damage at a neighbour's — nor delays, nor moral or punitive damages. Protection against those risks comes from liability insurance.
Can a client sue me years after water damage occurred?
Yes. In a ruling dated May 9, 2025, the Quebec Court of Appeal held a subcontractor plumber solidarily liable for water damage that occurred in 2018: $32,277.18 in corrective work plus a $5,000 deductible, seven years after the incident. Hence the value of liability insurance and of separating your assets.
Incorp-Québec is a document preparation service: we prepare and file your incorporation documents. We do not issue any licence and offer no guarantee of obtaining one: dealings with the CMMTQ, the RBQ and the CCQ remain yours.
Ready to become a plumbing contractor?
The corporation is set up before step 3 of the CMMTQ process: $497 all-in, the $397 government fee included, numbered company and initial declaration with the REQ included.
Your plumber incorporation — $497 all-in
A form of about 20 minutes, articles of incorporation, initial declaration with the REQ and government fees included. Your corporation's NEQ in hand for the CMMTQ licence application — a transparent document preparation service, from start to finish.