Soil Stack Diversion - Assistance Required!

Hi All,

My first post on here and am hoping someone is able to give me some advise about the below, unfortunately i'm no Plumber so excuse the non technical lingo!

Here's my problem:

Currently, my toilet connects directly to the soil pipe on the ground floor (picture below), we're looking to get an en suite upstairs, however, with the soil pipe inside the house I've been finding it difficult to get someone in to do the work. So I've taken it upon myself to do it myself.

Basically the plan is to box in the internal soil pipe and subsequently divert it outside as a soil stack. Add a vent to the top to allow air to come through and then connect up the waste from the en suite to the new stack.

I'm hoping by doing this it will avoid having to dig down to the soil pipe to create a new connection - just additional time and money! I'm just wondering whether my approach would be possible, and if so, any suggestions on what parts I should be using?

I've had some advice that if I'm going to do this that I need to minimise the amount of bends etc, but just looking to see if anyone else has done this / any additional advice.

Thanks all!

 

Thanks for the reply, red mark to the edge of the room = 315mm both sides (from the edge of the red mark).

En suite is located on an outside wall, unfortunately no drainage running at ground level