It is illegal to build a cob building larger than a shed in Canada?

Some preliminary research shows that it is not a simple answer. Here are some datapoints, but not a real answer yet:

-As I mentioned while the class was here, the EcoVillage OUR Ecovillage has pioneered new zoning laws and have built a large cob meeting space. See it on our website (scroll to the bottom).
-The cob building at Vancouver inner-city Grandview Elementary School discussed in this article reportedly faced “a snarl of permit and zoning red tape, especially if they’re public or school board buildings” but did eventually get built.
-This article suggests that when building a small cob building, you actually circumvent regulations. The article refers to Ian Marcuse's back yard cob just off Commercial Drive in Vancouver: “However, to build even a modest-sized house would require obtaining fist-fulls of building permits and approval under various zoning bylaws. Only small structures of less than 100 square feet, such as the cob shed, are exempt from the myriad of municipal regulations.”