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.
Let’s be clear about one thing: No workshop is perfect for everyone. If there were, I could simply give you a precise plan to follow with clear dimensions. Every person who comes to the hobby, avocation, or profession of woodworking has his own particular collection of tools and his own peculiar work style, skills, and desires for the kind of woodworking he wants to do that gives him a unique approach as to how he will lay out a shop: where the tools should go, where lumber and supplies are stored, and how much bench area he needs.