Commission itself is negotiated between Joel and each seller individually, often as a tiered rate with a higher percentage on the first portion of the price and a lower percentage on the balance, rather than one flat number quoted in advance. Total seller closing costs in Saskatchewan typically run 4 to 6 percent of the sale price once legal fees and adjustments are included. Commission is only part of that total, not the whole of it.
For a two-family property specifically, commission is often discussed alongside how the second unit's legal status affects marketing and buyer pool, since a permitted secondary suite widens the pool to both owner-occupiers and investors, which can change how a listing is priced and marketed even before commission comes up.
The honest way to know what your specific sale will cost is to ask Joel directly once he has seen the property, rather than comparing against a rate quoted for a different house entirely. Get your hand-reviewed valuation from Joel Dyck.