Best Answer

Hi, you could also consider a saniflow system which which can pump vertically for 5 meters to join the soil stack if needed.
Quote from saniflow:As the function of the units is to pump waste and water away, it should not usually be necessary to dig up the floor to lay the discharge pipework. It is possible to run the pipework from low level to a higher level e.g. from a basement to ground floor level, or from 1st floor up into a roofspace and then join to a soil stack.

Hope this helps.

For the kitchen sink you would initially need to access the drainage outside and create a point that reduces down to one and a half inch to except your drainage from the kitchen sink. It sounds like the concrete path will have to be dug up for this.
You'd then need to dig under the wall into the kitchen so that you can run your pipe under the floorboards, you'd also probably need to lift floorboards in the kitchen to make life easier for yourself when installing the pipe. Remembering that you should have a minimum of an 18mm fall in every metre.

The dishwasher would just connect up with the sink waste if it were next to it in the island.

If you are creating a bathroom in an existing bedroom you shouldn't need planning permission but you will need to inform building control about the works as there are certain regulations that need to be followed, and they will want to have a look. Speak with the Planning Dept at your local council, they are generally very helpful and will tell you exactly how to proceed.

Hello, i cant see much of a problem, sounds like your kit floor is sitting on sleeper walls on d.p.c so there is a nice gap underfloor. So it should be just a matter of digging and laying new pipes and drains which any plumber would be able to do,as far as planning needed dont see why kind regards rigsby.