If the property was ever a rental, a second home or only partly your principal residence, keeping records of capital improvements, a new roof, a permitted secondary suite, a rebuilt foundation, matters, because those costs raise your adjusted cost base and lower the taxable gain on the portion that isn't exempt.
Timing the sale across a tax year, or discussing the disposition with an accountant before you list rather than after an offer is accepted, gives you more options than trying to manage the number after the fact.
The City of Saskatoon's property assessment and any prorated tax adjustment at closing are separate from this question entirely and don't reduce a capital gain either way. Get your hand-reviewed valuation from Joel Dyck.