WC into understairs pantry - queries... anyone here?

[advicewelcom]

Hi, looking to do two projects:



PROJECT (A): Want to bring garage WC to below the stairs pantry
PROJECT (B): Then maybe turn the garage WC area into a shower room

Pic of the PROJECT (A) basic move:

Pic of the garage WC:

Pic of the pantry area:

Garage WC and Pantry on either side of the same wall with the Garage WC being a step down:

Further pics and details here:
Move Garage WC to understairs Pantry and convert Garage WC to a Shower Room - https://photos.app.goo.gl/GtCgH2a9YbByReJy8


First step is PROJECT (A) and its a nightmare tyring to find one person/company to do this at this time. So working out what I can do myself and the plumbing is the main issue so hence posting here. Can post elsewhere if needed:


I think the steps to do PROJECT (A) is:
1 Get the plumbing in for the new WC by extending waste through the wall
2 Plumb in the feeds for the WC and small sink
3 Fix a stud wall for the cistern and pan to sit against
4 Do the pantry floor
5 Plumb and bolt in the WC
6 Plumb and fix in the sink
7 Fix an ventilation fan
8 Make a door into the hallway
9 Stud wall where the current door is

These steps make sense?

Anything I am missing or anything else worth considering?

Welcome feedback, will have questions. Ta!

 

[advicewelcom]

Seems you got good advice.
You could certainly do the plumbing first and then re-visit the floor later if unhappy with it.
But if the soil pipe is going through the wall horizontally as post #10 suggests, might be good to leave some vertical play in that pipe if the floor level might be raised later!

Kept the previous floor as quarry tiles and got on with the plumbing - thanks, think it was the right shout.

Ripped out the old garage WC and put some pipe plumbing in and cemented some of it up...

4"/110cm Drain connector with boss into an elbow, then into an 110cm offset and then 110mm white pipe through the wall...

110mm Waste pipe then has a Rigid 90° Angled Toilet Pan Connector which fits on the WC Pantry pan waste...

But the garage waste piping is not sitting completely level to the floor...

A slight lift off the ground on drain connector part that faces the wall...

Anyone think this gap with the connector not being flush with the floor is a big issue? And should I do something different?

I could:

1. Change the offset to a bigger one on the garage black elbow and see if that works?
2. Or I could change the Rigid 90° Angled Toilet Pan Connector White for a flexi one?
3. Or maybe the impingement is the wall hole or floor and needs more knocking out?
4. Or put some plumbers putty/silicone/cement or something around the lifted connector front area?

Don't want any future leaks or smells in the garage area as there will be a new raised floor a shower ontop of the garage elbow waste piping.

Also worried about all these concealed connection points under a future floor, but I don't think I have any other solution.

Any piping options I am missing which would be a better idea or anything I should do to sure things up? If things aren't flush and there was a blockage and waste back tracked?

Welcome views.




(PS> If it helps with advise - side by side, the black drain connector that replaced the old white connector that the garage WC was plugged into)