Hi I have a problem as I building a double extention on my driveway but main sewarage going inderneath which is roughly 10feet deep If i to have easiest way I can connect existing toilet and new one with the existing pipe work making a internal chamber under floor without digging up or have a new inspection chamber on back of newbuilt extention and run through a new pipe line under the building into main big chamber in front of house.Please any advice.
Regards