New toilet upstairs

[Fireboy24]

Hi there. Have got a 50's ex council maisonette with cast iron stack. Customer wants a toilet upstairs. There is currently only one downstairs.Cutting the stack and putting a new tee on and replacing everything above it in plastic isn't an option due to the make up of the flats and access. Also Don't wanna run the risk of it shattering when cutting a hole in.
was wondering if anyone could see a good reason why I couldn't run a new stack from the toilet connection on the ground floor up to the 1st floor with some 45 bends and connect a toilet on to that????? It's obviously not great space wise and creates a lot of boxing in but I can't think of another way to get a pan connected up on the 1st floor......

 

[Chalked]

No reason why you can't, but will need venting.

 

[Fireboy24]

No reason why you can't, but will need venting.

Great. Was worried about blockages where it met the cast iron stack:-/ would a standard air admittance valve be ok above the pan connector on the new stack?

 

[kay-jay]

new toilet needs connecting to a tee rather than an elbow allowing you to stick a durgo on. if the stack is run in boxing in then make sure you vent the boxing in as the durgo needs a supply of air to work efficiently

 

[newcastle phill]

May have to inform building re change of use for a room to toilet ??

 

[Ermintrude]

May have to inform building re change of use for a room to toilet ??

And for sanitary pipework & appliances