OSHA 30-Hour Construction

The real 30-hour course is built from mandatory and elective topics that add up to 30 hours, not one continuous lecture. The mandatory core (14 hours) covers Introduction to OSHA, Managing Safety and Health, the Focus Four hazards (6 hours, with a required 1.5-hour minimum on falls specifically), Personal Protective Equipment, Health Hazards in Construction, and Stairways and Ladders. On top of that, a trainee has to complete at least 6 elective topics (30 minutes minimum each, for 12 required hours) chosen from a list that includes confined spaces, cranes and rigging, excavations, scaffolds, steel erection, fire protection, materials handling, ergonomics, and motor vehicles and mechanized equipment, plus 4 more hours a trainer can use to go deeper on any topic. It's built for supervisors, foremen, and anyone with safety responsibility over a crew, so it keeps everything from the 10-hour course but adds the management side: building a safety program, running inspections, and knowing when a hazard needs a formal procedure rather than just personal caution.

Structurally, it mirrors the 10-hour course's pass bar (module quizzes and a final exam both scored at 70%) but at real scale, around 300 knowledge checks spread across 19 lesson modules, plus a comprehensive final exam. Because a trainer can only deliver 7.5 instructional hours a day, a legitimate 30-hour course has to run over a minimum of 4 calendar days, which is worth knowing since a card claimed from a 1-day "30-hour" course is a sign the course wasn't run to program requirements. As with the 10-hour course, the completion card is issued by the OSHA-authorized trainer rather than by OSHA itself, and it doesn't expire.

Because OSHA 30 is built for people making safety calls on behalf of other people, not just for themselves, the material worth studying hardest is the judgment calls: who has the authority to stop a task, who's responsible for catching a hazard before it becomes an incident, and which situations need a formal, documented procedure rather than a supervisor's on-the-spot decision. The real exam leans into scenario-based questions for exactly this reason, less "what is a confined space" and more "you're the supervisor and this is happening, what do you actually do." Reviewing the difference between what OSHA 10 expects an individual worker to recognize and what OSHA 30 expects a supervisor to actually do about it is the fastest way to study the added material, instead of re-learning the Focus Four from scratch.

Two topics worth knowing cold, even though neither gets its own dedicated hour count in the official outline: OSHA's recordkeeping rule, which makes the employer, in practice often the supervisor closest to the incident, responsible for logging qualifying injuries and illnesses on the OSHA 300 log, and the multi-employer citation policy, the enforcement framework OSHA actually uses on a typical jobsite where a general contractor and several subcontractors are all present at once. Under that policy, a company can be cited as the creating, exposing, correcting, or controlling employer depending on its actual role, meaning a general contractor's supervisor can be held responsible for a hazard a subcontractor's crew created, if the GC had the authority to make them fix it and didn't. It's one of the clearest examples of why OSHA 30 spends so much time on supervisory responsibility rather than just hazard recognition.

Because the course runs at real scale, roughly 300 knowledge checks and a comprehensive final, spreading it across more than one sitting tends to produce better retention than trying to power through all 30 hours in a couple of long days, even where a provider technically allows it. Cost reflects that scale too: an online OSHA 30 course typically runs $160 to $190, while an in-person version with a live instructor runs considerably more, often $500 to $700, since it requires several full days of a certified trainer's time rather than a single classroom session.

The practice questions below are original, written to test the same kind of supervisor-level judgment the real exam does, not a copy of any real OSHA question. If you haven't already, the 10-Hour Construction exam covers the entry-level version of this same material, and How a Jobsite Actually Stays Safe walks through a real safety scenario end to end.