The Saskatchewan REALTORS Association benchmark tracks a typical home of consistent quality over time, which makes it excellent for direction and useless for your address. It cannot know that the shingles were replaced twice, that the electrical was updated from sixty amp service, that the windows went from single pane to triple, or that the kitchen was moved. None of that is on file anywhere unless a permit was pulled.
Long ownership brings a second question worth asking early. If the property has been your principal residence throughout, the Canada Revenue Agency principal residence exemption generally shelters the gain, but a rented suite, a period of non-residency or a change of use can carve out part of it. That is a conversation to have with an accountant before the property is listed, not after.
The answer for your house comes from a walkthrough and comparable sales, not an estimate keyed off an address. Joel Dyck's hand-reviewed valuation records the improvements that were never permitted or reported, prices them against homes that genuinely compare, and shows the adjustments so you can judge the reasoning yourself.