bathroom plumbing query

[njnorth]

Can someone give me some advice very quickly...

were in the middle of an extension which includes a downstairs bathroom. Its located off of a utility room one side with the toilet to be located behind this door as its the outside wall. Theres another door opposite for access to & from the bedroom.

We have planned to have a shower beth and sink on the other walls but have just had a thought about how they will meet the soil pipe with waste water. Do the pipes have to run around the wall or can the be put in the floor. Its not screeded yet.

Any advice is greatly appreciated as the internal walls are being built tommorrow and i dont know if i should move one of the doors so all pipes can run around a wall with no door for obstruction. Thanks .

[buildersmate]

Frankly your designer (or builder) should have thought about this before now. Soil pipe routings are on of the important fundamentals in the design of a dwelling.
If they are going in the ground, this is normally done during the foundations stage. If the oversight (rough concreting below the final screed, or alternatively a system of block/beam) has been laid already it is going to be a devil's own job to dig trenches now to put soil pipes in. These then have to run to a manhole (personhole?) outside the property and to the sewer system. Again, all done before the walls are constructed, normally.
You may have the option of a macerator/pump system to overcome the issue. These things can be fed by any waste water (including the loo). They chew up all the nasties and enable them to be pumped (so uphill if necessary) through a small pipe (50mm say, not 110mm) into the existing sewage system. But even the macerator outlet pipe needs to be routed around the skirting somewhere.