Sewer Pipe

When plumbing a new toilet, how low should the main sewer pipe be below ground?

I'm building a new basement downstairs in my house. As of now, there are no pipes down there, only the pipes that come from upstairs like the kitchen sink, toilet, bath tub and bathroom sink. When it comes to the new bathroom downstairs and more specifically the toilet, how far below ground should the main sewer pipe be?

You are building a new basement UNDER an existing house?!? You HAVE to mean that you are removing a relatively small volume of earth from under your house, and leaving enough earth foundation under the rest of the building to keep it properly supported, huh? I'm having a very dificult time visualizing this. But, let's say that you have that all figured out and the only problem you see now is how far below the basement floor the sewer line from the toilet you plan to install on the basement floor should be. Do you KNOW what the elevation of the city or community main sewer line which serves the EXISTING sewer line from your house is? It MUST be below the elevation of the floor of the new basement floor toilet outlet you are planning to install, or you are looking at a new sump & pump also that will have to be installed to lift the sewage from the toilet outlet to the inlet of the existing sewer line, and the elevation at which you set the elbow to the sewage sump below the sump pump won't matter. Methinks you're biting off more than you can chew. But I could be wrong.

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