City of Duncan
Only lots inside the city. Planning and development pages are published at duncan.ca. A Quamichan or South End address that feels like downtown is often the next municipality over.
Municipality of North Cowichan
Town of Lake Cowichan
The town permits its own buildings. It is a page on this Duncan site, not a second brand, and it is the wrong place to apply Duncan's without asking. No permit link was cited for the draft, so none is offered.
Town of Ladysmith
A nearby town with its own department. Do not send a Ladysmith file to North Cowichan. No town permit URL was in the sources.
Cowichan Valley Regional District
Electoral-area properties, including Cowichan Bay, Cobble Hill, Shawnigan Lake, Mill Bay, Saltair, and others such as Glenora or Sahtlam when the lot is regional. Start at the building inspection and permits page and the permit FAQ. Read them. Do not treat this summary as the permit rules.
If you are unsure which boundary you are on, the address on the tax notice beats a guess from a highway sign. Bring that to the roofer as well. The wrong office is a delay, not a roofing technique.