Leaking exterior waste and outlet pipes

Suzkin

Short of remodelling the bathroom, is there a way of connecting the waste outlet pipes of the bath and sink (I shall remove the bidet) *under the floor boards of the bathroom* so that there is only one pipe physically coming out of the house back wall? (The toilet waste pipe will be left alone - it's is the only pipe not leaking...).

Background:
Hope this is fairly clear and I'm using the correct terminology here : My bathroom is on the first floor, and is effectively the upstairs back room (It's a 2-up, 2 down arrangement, with a downstairs utility room attached). The house is terraced, so no rear access.

All the bathroom waste outlet pipes (i.e. bath, sink, disused bidet, toilet) lead separately to the back exterior of the property. Outside, each pipe is connected individually to one thin long diagonal pipe, and this connects to the main vertical waste pipe.

The pipes (with the exception of the toilet waste pipe) are situated over the downstairs utility room pitched roof. This makes access to the pipes very difficult, and requires a scaffolding tower to reach them (an extra expense...).:(

My problem: *ALL* the back pipes (including the bottom 6ft of main waste pipe) are leaking at the joints. I need to replace the pipes in their entirety as they are so old. However, when I do, I want to reposition them away from above the utility room roof to ever avoid having to pay for scaffolding again.

As if it couldn't get worse: The downstairs kitchen waste pipe is also leaking - although easily accessible - but this is attached to the bottom 6ft part of the main waste pipe - which is leaking and itself needs replacing!! :eek:

If anyone could give me some constructive advice I'd be so grateful.

anotherbaldrick

Suzkin.
It would be possible to run a new waste collecting pipe in the floor to connect to the external soil stack providing thought was given to avoiding syphonage (another issue) of the traps to the fittings. The problem this usually causes is that the route may cross the floor joists which will mean them having to be notched (cut into) which will weaken them , not good. Can you run the new waste at low level , skirting level on the inside of the wall where it could be boxed in ?

Suzkin

Thanks for your advice. Ideally, I was hoping not to have an external boxed-up pipe in the bathroom, although I can now appreciate the reasons for this. I'll have a good think...!

Suzkin

Thanks andrew-b. Any idea how much all this could cost? (ball-park figure?).