@Curtis Sharpe I completed a BRRR deal on a duplex in Montreal earlier this year. However, the hardest part was actually the refinance. Since a duplex is considered as residential property for banks they primarily look at your income. If you don't have a well paying job or a solid co-signer for the mortgage chances are banks wont let you refi. With the new stress test rules and higher interest rates you need to qualify for an interest rate above 5%. I believe its a lot more easier to work with banks in the US than it is in Canada.
Since I'm newly self employed banks wont consider my income at all! It was definitely a challenge to get a bank to work with me but fortunately the property was in a holding company and Desjardins Commercial was willing to refi the duplex as a commercial loan. Commercial loans differ from residential loans in many ways. They have upfront fees, higher interest rates and possibly lower amort. periods. But the good thing is that they don't primarily look at your income. At the end they were willing to lend at an LTV of 70% and was able to recoup my down payment and a small portion of my construction costs.
Looking back, Im only doing BRRR's on bigger properties now (6 units and up) unless I have a solid investor who is willing to co-sign the mortgage on a smaller deal.