Can I Redirect soil pipe?

[Jim234]

We are having a few rooms knocked together down stairs and need to put a window in where the soil pipe is currently. Please can you advise what the regulations are for redirecting this? Can it go round the window and back into the drain below or do I need a whole new drain? I have attached some photos. The existing door is being bricked up and the window extending over the waste pipe ideally. We will have a new toilet to the left of the exisiting door with a new small window. Also, what would be the costs involved in this? And where can I find the legislation around soil pipes? Thank you!

 

[ShaunCorbs]

Yes you would need a new soil stack would run it up either to the right roughly where the hose pipe pack is or to the left where the first pic blue writing is need to modify the underground drainage so ground work is involved and then a new stack with new waste pipes going to 3 toilets and your bathrooms

Would expect around a couple of ks ish