converting bathroom


My brother has a downstairs loo and an upstairs bathroom, he is just about to embark on renovating the bathroom and wants to move the toilet upstairs into the bathroom. Where the toilet is now the soilpipe comes out of the back of the toilet and down into the concrete floor inside the house. His bathroom is not directly above the toilet so what he is thinking of doing is bringing the soil pipe out of the house upstairs, connecting a 90degree bend, running the pipe across the back of the house outside about 6feet, giving a drop for waste to flow, putting another 90 degree bend to enable the pipe to come back in the house, once back inside, one more bend to a vertical drop into the existing pipe. He then intends to box in the pipes and use the toilet as a utlity room. He doesnt want to have to dig up the drains and connect that way. Is this a workable idea and does he need to inform anyone if he can do these changes? Pete
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a clunky and false-economy solution, running the possibility of blockages all the time
I guess he got estimates from plumbers to do it properly?

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