Certifying authority: Skilled Trades Ontario (STO). Last checked 2026-09-10.
This trade is on Ontario’s compulsory list as Sheet Metal Worker (308A). Under Skilled Trades Ontario, workers must hold a valid Certificate of Qualification, a Provisional Certificate of Qualification, or a Registered Training Agreement; journeypersons must renew their C of Q each year. Official list PDF is dated Feb 2022; the count of 23 still matches the current STO page.
Source: Skilled Trades Ontario — Compulsory Trades (23 trades)
Start with 10 free interactive Sheet Metal Worker (308A) questions with worked explanations, or take a full 120-question timed mock exam weighted to the official RSOS breakdown.
Try the 10-Question Interactive Sheet Metal Worker (308A) Quiz & Free PDF → Take Full 120-Question Timed Mock Exam ($14.99 CAD) →Or unlock all Sheet Metal Worker (308A) questions with the 7-Day Pass ($9.99) or 3-Month Pass ($69.99, Free-Until-You-Pass Guarantee).
Whether it is required or not, the exam itself is the same paper everywhere in Canada. What your province decides is whether you must hold the certificate, how you apply, and where you sit it.
The Red Seal Occupational Standard sets the split below. It does not change by province.
| Major Work Activity | Weighting | Questions |
|---|---|---|
| MWA A: Performs common occupational skills | 20% | 24 Qs |
| MWA B: Performs fabrication | 32% | 38 Qs |
| MWA C: Installs air and material handling systems | 34% | 41 Qs |
| MWA D: Installs roofing and specialty products | 8% | 10 Qs |
| MWA E: Performs maintenance and repair | 6% | 7 Qs |
Source: Red Seal Exam Breakdown — Sheet Metal Worker (308A), red-seal.ca
4 hours, and a 70% pass mark (84/120). These are set provincially rather than by the Red Seal standard, and the four hours is the same whether your paper is 100 or 150 questions.
Confirmed against Skilled Trades Ontario’s Exam Preparation Guide and SkilledTradesBC. Check your own authority before exam day.
Click any option (A–D) below to grade yourself immediately and view the worked explanation:
Fall protection is required at about 3 m in most provinces. Guardrails come first, then travel restraint; where the worker must reach the open edge and restraint cannot be used, a personal fall arrest system with a full-body harness, energy-absorbing lanyard and suitable anchor is required. A monitor and warning lines do not protect a worker at this height. A safety net needs its own engineered design and supports, which is far more than this duct joint calls for, and it does not fit a worker reaching the edge from this mezzanine.
The seam edges are formed while the pattern is still flat. The corner sections are then curved by light bends along the element lines that fan out from each corner, while the flat triangles stay flat, and the seam is closed and the round end trued last. The other options use the same steps in the wrong order: B does 'close the seam, true the round' before 'bend lightly along corner lines', C does 'close the seam, true the round' before 'form the seam edges while flat', and D does 'close the seam, true the round' before 'bend lightly along corner lines'.
Access is provided so that the device can be seen and reached, here with a hinged grille or a door, and it is checked from below. Cutting drywall for each test is damage, not access. A test from the roof does not reach the detector, and reaching in by feel is not a proper test.
Booking is handled by Skilled Trades Ontario (STO); confirm current locations and dates with them.
Our Sheet Metal Worker (308A) question bank is built to the official RSOS weighting above, with a worked explanation and code citation on every question.
Continue to Full 10-Question Interactive Sheet Metal Worker (308A) Quiz → Take the full 120-question timed mock exam →