Oh PigletJohn! can you help me with a loo question please?

[BogeyNights]

We have a downstairs loo off our utility room at the back of the house.
It currently has a saniflo unit to dispose of just the toilet waste. It's packed up (after about 8 years, so no too bad really) and we're in a position where we've obviously got to replace it.

However, the loo is situated 2.5 metres from the outside wall. We are wondering if we can replace the saniflo with a ordinary soil pipe instead. We don't want to dig up the floor to put in the pipe, but were hoping instead the run the soil pipe from the loo to the outside wall, along another wall (which is perpendicular to the outside wall) and box it in. It will be 'hidden' behind my washer and dryer and freezer that run along that perpendicular wall.

The fall is about 12cm from the soil pipe to the floor and as I said, the loo is approx 2.5 metres from the outside.

The waste water pipes for the washer and sink go to a drain directly outside the utility room wall, so could that be adapted for accommodate the soil pipe waste?

I don't mind outside being dug up to get the pipe to flow to the main sewer, but I really don't want the inside of the house to be dug up!

[PigletJohn]

it sounds like you might be able to, but ask a local plumber to have a look.

The soil pipe will be 105mm diameter, which is quite big.

If not, rip out the saniflow and use a bucket or a hole in the back garden, it will be more sanitary and less troublesome.

[BogeyNights]

Hmmm I'm guessing you're not a fan of saniflo, piglet
Will ask my friendly neigbourhood plumber then. Thanks

[FantasticMrsFoxx]

I used to live in a 1900s tenement flat that only had the internal bathroom installed in 1982 (before that they used a shared WC on the half landing).
The soil pipe from the bathroom ran at least 6m under the kitchen floor to the external down pipe, but as PigletJohn said, I reckon it was a good 10cm in diameter. The WC was also installed in the days before 'save a flush' so the cistern was huge to ensure the 'solids' got flushed out.
We had suspended wood floors which it sounds like you don't have, and that may be your issue in doing what you want to do.