There are a few things particleboard is NOT. It’s not medium density fiberboard (MDF)—a material with greater density and weight composed of more uniform particles. It’s NOT oriented strand board (OSB), a material composed of large wood chips and strands that’s structurally equivalent to plywood. It does NOT have great nail or screw holding ability, nor is it all that water resistant; water can quickly cause the material to swell and lose structural integrity. But if you need something flat and cheap for use in a dry place, particleboard will do you proud. Learn how to make a plastic laminate tabletop with a particleboard substrate.
After a permit has been issued, the building inspector will want to be notified at various points during your build in order to do a site visit, walk around and inspect the details to make sure that they meet code requirements. These inspections are commonly at the point where excavation work is complete, when the foundation is completed but before back-filling, when framing and all structural work has been done, after the installation of the insulation and vapour barrier, and then a final inspection after everything is complete. You may need to have a separate plumbing inspector if you’re adding or changing plumbing fixtures, and electrical work will need to be inspected by the appropriate electrical inspector (in Ontario, the Electrical Safety Authority). In my experience, inspectors appreciate good work, a clean, safe site, and are willing to work with homeowners and builders to make sure that the work will meet code and will endure.