An acreage in Corman Park usually adds well water and a septic system to the picture, and a secondary suite or garden suite there needs both sized correctly for the extra occupancy, a check a City of Saskatoon lot on municipal service never has to pass. A home inspection, typically $400 to $600, is worth budgeting on top of well and septic testing, since road access and school busing are the other questions an RM property raises that a city lot does not.
The RM 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 is the same: a legal, permitted structure supports value and an unpermitted one does not.
Joel Dyck can point you to the right Corman Park contact before you spend anything on design. Get your hand-reviewed valuation from Joel Dyck.