If your 313A apprenticeship is complete and you are about to book the written certifying exam, the fee shown in guidance can be confusing. STO's general scheduling page tells candidates to pay $150 plus HST, while its completed-apprentice page describes an automatic waiver for an eligible first written attempt. Both pages were checked on 2026-10-12. This is a researched booking question, not a newly announced fee change; your own STO record and Authorization to Test Letter govern your next step.
Who does STO say receives the first-attempt waiver?
STO says the waiver applies to the first written certifying exam attempt for a completed Ontario apprentice and is applied to the account automatically. Its detailed eligibility says apprentices who completed their program before January 1, 2025 are not eligible, even if they write later. It does not cover a rewrite, a practical exam, study materials or a prep course. The stated rewrite fee is $150 plus HST.
The waiver belongs to the completed-apprentice route. A worker approved through Trade Equivalency Assessment has a separate route to exam eligibility; STO's waiver page does not extend this apprentice benefit to trade qualifiers. A qualifier should confirm the fee on their own STO account instead of assuming that a first attempt is free.
Why does the general booking page still say to pay?
STO's general exam scheduling instructions include a $150 plus HST payment step for eligibility and say an Authorization to Test Letter follows payment. The more specific completed-apprentice instructions say the qualifying first-attempt waiver is automatic. Those two public descriptions are not fully reconciled on the pages. Do not pay twice or bypass a portal step based on a blog summary. Check the fee and waiver shown in your STO Portal, follow your own letter, and ask STO if the record conflicts with your completion date.
Before treating any fee result as an exam date, confirm that apprenticeship completion is officially recorded. The provisional-certificate checklist separates completion, provisional status and testing authorization.
What should you check before booking or rewriting?
Write down three facts: your recorded apprenticeship completion date, whether this is your first written attempt in 313A, and the fee currently displayed in your STO Portal. Keep the Authorization to Test Letter and booking confirmation together. If you are rewriting, the rewrite guide covers the separate waiting period and fee. Ask STO to resolve any mismatch in your individual record before you book.
For study, use the Ontario 313A exam guide and the current-standard explanation. Red Seal still identifies the previous occupational standard as the basis of current exams; exams based on the newer standard remain under development as of this check. The free five-question sample is original, unofficial draft practice awaiting certified-mechanic review and cannot predict a pass.
Sources
- Skilled Trades Ontario: Provisional Certificate of QualificationFirst written attempt waiver, cutoff and exclusions; checked 2026-10-12
- Skilled Trades Ontario: Exam schedulingGeneral payment and Authorization to Test instructions; checked 2026-10-12
- Skilled Trades Ontario: Trade Equivalency AssessmentSeparate trade-qualifier route; checked 2026-10-12
- Red Seal: Refrigeration and Air Conditioning MechanicPrevious standard remains current-exam basis; checked 2026-10-12
Examen Studio is independent and not affiliated with the Red Seal Program or Skilled Trades Ontario. This article is a study aid; on the job, follow current codes, regulations and manufacturer instructions.