Garage renovation

Hi friends, I am a native of New York. But now I am settled in Toronto with my family. I am a businessman very crazy about cars. Recently, I purchased a new car. But the problem that I face now is that there is no sufficient space in my garage to board 2 cars as I already have one. If I go for a garage extension, I will be left with no space in the backyard for disposing of waste. Since I am new to this place, I'm unaware of the dumpster rental service? Are they affordable? I would like to know how are you disposing of the wastes. Expecting your valuable suggestions. Thanks in advance.