Adding a stand alone tub to my home

[shelbydz]

Hi all,
We recently bought a home. We'd like to build a bathroom, adding a bathtub. My biggest question is about adding the drain for the tub and eventually sink and toilet into our homes existing drain. I have access under the existing bathroom and where I want to put the new equipment.

Once I know where my tub will go and where the drain will go, how do I connect it to the existing system? I've attached pictures of both parts. The first picture is the existing bathroom. Second is almost a straight shot from where I want the new location to the old. Does the new drain need a p-trap under the tub? Does it need to be higher than where it'll connect to the existing (so it will flow down)?

Thanks for all the help!

 

[breplum]

It will be tricky, but may be possible.
Tubs require p-trap, everything needs to be higher to drain.