Millwrights install, maintain, troubleshoot and repair industrial machinery, from conveyors and pumps to turbines and production lines. In Ontario the trade is called Industrial Mechanic Millwright (433A). It's a Red Seal trade with strong demand in manufacturing, mining, pulp and paper, power generation and food processing.
Not compulsory: what that means
Because 433A is not compulsory, you don't legally need to be an apprentice or certified to work as a millwright in Ontario. Skilled Trades Ontario notes the Certificate of Qualification does not have to be renewed. Even so, most good employers and unions strongly prefer certified millwrights, and the Red Seal makes it easier to work in other provinces. The program is competency-based: the 8,000 hours are an industry guideline, and your sponsor signs off the logbook skills as you master them.
Step 1: Get the right education
The minimum academic standard is Grade 12. Math, physics and technical courses are especially useful, since the trade involves precision measurement, alignment, hydraulics, pneumatics and mechanical power transmission. Many Ontario colleges offer mechanical techniques or millwright pre-apprenticeship programs.
Step 2: Find a sponsor
Plant maintenance departments, industrial contractors and the Millwright Regional Council's union locals all train apprentices. Look at current millwright jobs from Job Bank. Entry-level maintenance helper roles can also lead to sponsorship. Our apprenticeship guide covers registering with a Registered Training Agreement.
Step 3: Complete training
You'll complete three levels of in-school training (720 hours in total) alongside on-the-job work. Track your hours and logbook sign-offs carefully. Our hours tracker is free.
Step 4: Write the Red Seal exam
The Red Seal Industrial Mechanic (Millwright) exam has 135 questions. The largest blocks are mechanical power transmission (32 questions), common occupational skills (25) and material handling and process systems (24). Fluid power, rigging and predictive maintenance make up the rest (Red Seal exam information). The pass mark is 70%. See our Red Seal exam guide and 12 study tips.
Experienced but never apprenticed?
If you've worked as a millwright without completing an Ontario apprenticeship, Skilled Trades Ontario's Trade Equivalency Assessment may let you qualify to write the exam.
What millwrights earn
For NOC 72400 (Construction millwrights and industrial mechanics), Job Bank's 2025 wage data shows a median of $35.59/hour in Ontario and $37.00/hour nationally (Job Bank wages, 2025). Details are on our Millwright trade guide.
Checklist
- Finish Grade 12 with math and physics
- Consider a mechanical techniques or pre-apprenticeship program
- Find a sponsor and register (433A)
- Complete 3 levels of school and your logbook skills
- Pass the 135-question Red Seal exam
What the work looks like
A typical day might start with a preventive maintenance route: checking bearings for heat and vibration, topping up lubrication and inspecting belts and chains. Then a breakdown call pulls you onto a production line where a gearbox has failed. You'll lock out the equipment, diagnose the fault, pull the gearbox, rebuild or replace it, align it to the motor and hand the line back to production. On installation jobs, millwrights set baseplates, level and grout machinery, rig heavy components into place and commission new systems.
Because breakdowns cost plants money every minute, good millwrights are valued for calm, methodical troubleshooting as much as for their hands-on skills.
Tips for landing a millwright apprenticeship
- Show mechanical aptitude: list engine work, farm equipment, machining or welding experience on your resume.
- Take a forklift or elevating work platform course if one is offered locally. Plants value these.
- Apply to maintenance helper and general labour roles at plants that employ millwrights, then ask about apprenticeship openings once you're inside.
- Follow union apprenticeship intakes if you're interested in construction millwright work.
Frequently asked questions
How long does a millwright apprenticeship take in Ontario?
Skilled Trades Ontario describes 433A as about four years: 7,280 hours on the job plus 720 hours in school. Because the trade is competency-based, the hours are a guideline and your sponsor signs off your skills as you achieve them.
Do I need to be certified to work as a millwright in Ontario?
No. 433A is not compulsory, so certification isn't legally required. Many employers still ask for it, and the Red Seal is the most widely recognized proof of your skills.
Is millwright the same as industrial mechanic?
In the Red Seal Program and in Ontario, the trade is Industrial Mechanic (Millwright). Some provinces and unions also use "construction millwright" for installation-focused work. Job Bank groups both under NOC 72400.
What skills matter most?
Precision measuring, shaft alignment, bearings, gears and couplings, hydraulics and pneumatics, rigging, and troubleshooting. Welding and machining basics are also useful. The exam breakdown gives the most questions to mechanical power transmission.
Where do millwrights work?
Factories, mines, mills, power stations, food processing, warehouses with automated systems, and industrial contractors that install and move equipment. Shutdown work can mean long hours and overtime.
This article is general information for people exploring trades careers in Canada. Rules, programs and amounts change and differ between provinces and territories — confirm details with your apprenticeship authority and official government sources.