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how do you know it would collapse

i gather you mean because of the depth. speak to building control ask them if its ok to build the new manhole and enter the waste pipe higher up. if its only sink waste i cant see a problem. good luck

sounds like you know what you are doing . make sure you have enough headroom under staircase(2m) and use a screed mix of 4 parts sharp sand 1 part cement for floor rather than concrete

if you can trace where the pipe goes out of extension you could build a new manhole to take your waste,providing its on your land. other than that the least expensive would be to take up the floor but then you would possibly need an internal double sealed manhole cover but as it is only sink...

hi. i am about to replace my patio doors with an arched set of french doors. my question is instead of replacing lintel with an arched one , saving all the knock out inside, would the lintel that is already in place lose any strength if i cut the front ledge(which would normally support the...