Based on the Red Seal Carpenter standard, the NBC, and the Ontario Building Code
About the certification
In Ontario, General Carpenter is trade code 403A. The written Certificate of Qualification (C of Q) exam is administered by Skilled Trades Ontario. Carpenter is a Red Seal trade, so Ontario's certifying exam is the interprovincial Red Seal Carpenter exam — passing it earns both your C of Q and the Red Seal endorsement recognized across Canada.
The Red Seal exam has 100 multiple-choice questions with a 70% pass mark, and candidates are generally allotted up to about four hours. Questions are built from the Red Seal Occupational Standard for the trade, which also supplies the math formulas — area, rafter rise and run, and volume among them — used for the exam's calculation questions.
ExamHub's free 403A practice quiz has 180 original questions across seven topic areas that mirror the official exam weighting, with an explanation and a cited source for every answer. It is unofficial study practice — always confirm current requirements with Skilled Trades Ontario, the National Building Code, and the Ontario Building Code (O. Reg. 163/24).
What's covered
Categories map to the Red Seal exam's Major Work Activity blocks, with framing and concrete work the most heavily weighted — just as they are on the real exam.
Try a few
Five questions pulled from the full bank, with the answer shown — use the quiz above for the real timed experience.
Why: Rigging gear used for hoisting is rated with a 5:1 safety factor built in — its working load limit is set at roughly one-fifth of the breaking strength — to absorb shock loading, wear, and uncertainty in the actual load weight.
Why: Volume = length × width × height: 12 × 0.6 × 0.2 = 1.44 m³. This is one of the formulas the Red Seal exam sheet supplies, and it's the basis of every concrete quantity takeoff on a footing or slab.
Why: O. Reg. 213/91 sets 1.2 m as the depth at which a trench must have a protective system — sloping, benching, shoring, or a trench box — in place before anyone enters, since cave-ins at even modest depths carry enough soil weight to be fatal.
Why: The Ontario Building Code's guard requirement is triggered once the difference in elevation between a walking surface and the adjacent grade or floor exceeds 600 mm — below that height, a fall is considered a lower risk and a guard isn't mandated.
Why: The Ontario Building Code requires eave protection membrane to run at least 900 mm up the roof slope from the edge, reaching a line no less than 300 mm inside the wall's inner face — far enough to stop water that backs up under an ice dam from reaching the roof deck over heated space.
FAQ
The interprovincial Red Seal Carpenter exam has 100 multiple-choice questions. ExamHub's practice bank has 180 original questions, and the timed 'Test Me' mode draws a 100-question practice test to match the real exam's exact count.
The Red Seal exam pass mark is 70%. Ontario's Skilled Trades Ontario certifying exams generally use the same 70% threshold, and ExamHub's quiz uses it too.
Red Seal certifying exams are generally allotted up to about 4 hours. ExamHub's Test Me mode gives you up to 4 hours as well.
The Red Seal exam weighting is split across seven blocks: common occupational skills, planning and layout, concrete work, framing (the largest single block), exterior finishing, interior finishing, and renovations.
No. These are original questions written by ExamHub from the Red Seal Occupational Standard for Carpenter, its published exam weighting and math-formula sheet, the National Building Code of Canada, the Ontario Building Code (O. Reg. 163/24), and O. Reg. 213/91. They cover the same topics but aren't copies of any real exam. Always verify against current code before relying on any value in the field.