Building a duplex, what laws, codes do I have to consider?Ont,Can

[Trevor Miller]

I'm currently looking into purchasing a property in a very desirable neighborhood, the home itself is outdated and looks out of place. However, the good news is it would be a perfect place to build a beautiful premium duplex. I think the neighbors will be mostly for it because the surrounding homes are in the values of 320K+ and this homes valued at 150K, with the estimated value on the duplex being 350K-450K it would be good for their home values. Now I'm at the point where I'm trying to learn about what laws i might have to consider when building a duplex here. The neighborhood is in Ontario, Canada in the Windsor region. I'm looking for any guidance, suggestions, places I could go to learn, past experiences or answers that could help me in my current situation. 

Thank you for taking the time to help !