An acreage in Corman Park usually adds well water and a septic system to the picture as well, and a secondary suite or accessory dwelling there needs both sized correctly for the extra occupancy, which is a separate inspection from anything a City of Saskatoon lot would ever require, on top of a standard buyer's inspection, typically $400 to $600, once the structure itself is checked.
The rural municipality also runs its own assessment and its own Board of Revision, separate from Saskatoon's, so a permitted addition changes that property's assessed value through a different process than it would inside city limits, even though the underlying logic, a legal structure supports value while an unpermitted one does not, is the same.
If you are weighing a Corman Park acreage against a city lot for this kind of project, confirm the rules with the rural municipality directly before you build, not after. Get your hand-reviewed valuation from Joel Dyck.