"jj3000" wrote in message
om...
My house is one level with attic and crawl space, it has one bathroom
only, but, my master bedroom has a "room" that has a sink, and a door
that also lead to the bathroom.
My plan is to convert this sink room to a full bath room. the existing
sink and cabinet is rather large and I could see a small vanity,
toilet, and stand up shower can be added to this room making a 2nd
bathroom.

The question I have is of course the plumbing, can the supply all tap
off the faucet of the sink even for the shower?

A fan and vent needs to be added, can it go up the attic and tee into
the existing bath's vent? The 2 fans of the new and old bathroom
would only be about 5-6' apart. That way I do not have to cut up the
roof.

I need some advice for the draining, I assume the sink right now
drains to some main line under the house. Would the toilet and shower
be all using the same drain?

Would I need to replace the drywall with concrete board?

Is there anything else I didn't think of?? any advice is appreciated.

I can tell from the way you worded the questions that you are inexperienced
in plumbing.

The biggest issue you face is drain lines and vents for those drain lines.
The toilet needs a 3" pipe and you may or may not be able to tap into the
existing sewer and have it work. If you can drain the toilet, the shower
and sink can tie into the same line.

Your best bet would be to get a few estimates and see what some pros say.

Colbyt