Fast facts
| Trade code | 452A |
|---|---|
| Sector | Construction |
| Classification | Voluntary trade |
| Certifying exam | Required (O. Reg. 876/21, s. 3) |
| Apprentice to journeyperson ratio | Subject to a ratio (O. Reg. 876/21, s. 4) |
| Red Seal trade | Yes |
| Active apprentices in Ontario | 540 (reported in Ontario's apprenticeship dataset) |
| Approved sponsors | 8 |
| Certifying body | Skilled Trades Ontario |
Last verified August 20, 2026 against the sources listed below.
What does a reinforcing rodworker do?
A Reinforcing Rodworker reinforces a wide variety of concrete constructions including but not limited to buildings, landscape features, parking garages, caissons, highways, bridges, wind turbines, stadiums and towers by using reinforcing steel, composite materials, welded wire mesh, post-tensioning systems and any other concrete reinforcements.
Skilled Trades Ontario describes the work of this trade as follows:
- cuts and bends reinforcing materials according to design specifications and drawings
- fabricates, pre-fabricates and installs reinforcing steel, composite materials, welded wire mesh, post-tensioning systems and any other concrete reinforcements.
- operates and maintains tools, aerial work platforms, forklifts and telehandlers
- prepares reinforcing and post-tensioning materials for hoisting
- rigs and hoists materials and equipment
- splices reinforcing steel by welding or installing mechanical splices
- installs, stresses and grouts post-tensioning systems
How long is the reinforcing rodworker apprenticeship?
| Total training hours | 4,000 |
|---|---|
| On the job | 3,640 hours |
| In school | 360 hours |
| In-school levels | 2 |
These hours are set by the Registrar of Skilled Trades Ontario under section 14 of the Building Opportunities in the Skilled Trades Act, 2021.
What do you study in school for the 452A?
The in-school portion covers, but is not limited to:
- applied trade practices and calculations
- interpretation of concrete reinforcing drawings
- pre-fabrication and fabrication of concrete reinforcing members
- installation and inspection of concrete reinforcing members
- rigging and hoisting
- post tensioning drawings, layout and modification
- post-tensioning installation, assembly and inspection
Is reinforcing rodworker a compulsory trade in Ontario?
No. Reinforcing Rodworker is a prescribed trade under section 1 of O. Reg. 876/21, but it is not on the compulsory list in section 2. That means you can legally work in this trade in Ontario without holding a Certificate of Qualification. Certification is voluntary and serves as formal proof of competency to employers and clients.
Voluntary classification only covers certification under the Building Opportunities in the Skilled Trades Act. Specific work within the trade can still require separate licences or permits under other Ontario statutes, so confirm the rules for the actual work being done. The 23 trades where certification is mandatory are on the compulsory trades list.
How do you become a reinforcing rodworker in Ontario?
The apprenticeship pathway for this trade is administered by Skilled Trades Ontario under section 14 of the Building Opportunities in the Skilled Trades Act, 2021:
- Find a sponsor and register a training agreement. An employer or union sponsor takes you on and the training agreement is registered with the ministry.
- Complete the on the job and in school training. The skills are set out in the trade's Apprenticeship Training Standard, signed off by your sponsor as you demonstrate them, alongside levels of in school theory at a training delivery agent.
- Receive your Certificate of Apprenticeship. Skilled Trades Ontario issues it when the program is complete.
- Pass the certifying exam. This trade has a certifying exam under O. Reg. 876/21, s. 3. Passing it earns the Certificate of Qualification, the voluntary proof of qualification for this trade.
The exact training standard, current curriculum and program details are on the Skilled Trades Ontario page for Reinforcing Rodworker. On the job hour requirements vary by trade and are not published on this page yet; confirm them in the training standard before signing an agreement.
Is there an apprentice to journeyperson ratio for the 452A?
Yes. Reinforcing Rodworker is one of the 33 trades that section 4 of O. Reg. 876/21 makes subject to an apprentice to journeyperson ratio. The regulation establishes that a ratio applies, but the numeric ratio itself is not stated in section 4. Confirm the current ratio with Skilled Trades Ontario before registering an additional apprentice, because it limits how many apprentices a sponsor may train at once.
Is the 452A a Red Seal trade?
Yes. Reinforcing Rodworker participates in the Interprovincial Red Seal Program, the national standard for the trade across Canada, stewarded by the Canadian Council of Directors of Apprenticeship. A Red Seal endorsement on an Ontario Certificate of Qualification means the qualification is recognized in other provinces and territories without re examination, which matters for workers moving between provinces and for employers hiring from outside Ontario.
The Red Seal exam for this trade, written under the national title Ironworker (Reinforcing), has 120 multiple-choice questions, each with four possible answers and exactly one correct answer.
How the 120 questions are distributed
| Block | Questions |
|---|---|
| A. Occupational skills | 19 |
| B. Rigging and hoisting | 28 |
| C. Cranes | 5 |
| D. Reinforcing | 57 |
| E. Pre-stresses/post-tensions | 11 |
Already experienced? The Trade Equivalency Assessment
Workers with experience from outside Ontario's apprenticeship system, or from another country, can apply for a Trade Equivalency Assessment instead of starting an apprenticeship. Approval requires verifiable evidence of competency in the trade's Training Standard and experience at least equal to the trade's total training time; if approved, you challenge the certifying exam directly. The assessment costs $235 plus HST, and a reassessment with new evidence costs $100 plus HST, per Skilled Trades Ontario's Trade Equivalency Assessment page.
Certification is not the only paperwork
A Certificate of Qualification covers the person. Running a business in the trade carries its own obligations: many Ontario municipalities require a contractor licence on top of personal certification, and construction employers must complete WSIB registration before work begins. Both are indexed on our sister site: municipal contractor licensing requirements by city and WSIB Form 1000, registration of constructors and employers, on Ontario Trade Registry.
What does a reinforcing rodworker earn in Ontario?
| Median wage | $44.34 per hour |
|---|---|
| Low | $32.27 |
| High | $50.25 |
| Occupation measured | Ironworkers (NOC 72105) |
| Reference period | 2023-2024 |
Published by Employment and Social Development Canada through Job Bank, for Ontario as a whole. Read it as the pay range for the occupational group this trade belongs to, not a guaranteed rate: one NOC code can cover more than one trade, and wages vary by region, employer and experience.
Is the 452A recognised outside Ontario?
This trade has been part of the Interprovincial Red Seal Program since 2006. 9 of Canada's 13 provinces and territories designate it Red Seal: AB, BC, NB, NL, NS, ON, PE, QC, SK, Ontario among them. Its National Occupational Classification code is 72105, which is how federal labour market data refers to this occupation.
Where can you train as a reinforcing rodworker in Ontario?
| Public training providers | 1 colleges deliver the in-school portion |
|---|---|
| Private training providers | 3 |
| Approved sponsors | 8 employers registered to train apprentices |
| Apprentices in training | 540 |
Counts are from Ontario's published apprenticeships dataset. A sponsor is the employer or union that registers and trains the apprentice; you need one before an apprenticeship can start.
How dangerous is construction work in Ontario?
Ontario does not publish injury figures per trade, only by sector. In 2024 the Ministry of Labour recorded 18 worker fatalities and 442 critical injuries under the construction health and safety program. See the ten-year counts and what they leave out.
Related Ontario trades
Other construction sector trades with certification records on this registry:
Official verification sources
- RegulationO. Reg. 876/21, Prescribed Trades and Related Matters (e-Laws)
- Certifying bodySkilled Trades Ontario: Reinforcing Rodworker
- ActBuilding Opportunities in the Skilled Trades Act, 2021 (e-Laws)
- WagesJob Bank wage data, Employment and Social Development Canada
- Red Seal profilered-seal.ca: Reinforcing Rodworker trade profile
- Participation dataOntario open data: Apprenticeships dataset
Classification, exam requirement and ratio status on this page are read directly from O. Reg. 876/21 as consolidated on e-Laws, not from secondary summaries. Facts not yet verified against a primary source are marked as not published rather than estimated.