It is assumed that waste from a toilet, shower, steam room, small kitchen, plant room etc. will just flow down and go away as it does from your main bathroom and main kitchen on the ground floor.
But your basement is already deeper than your sewer that discharges into the system under the road.
Your foul waste from your basement needs pumping up to discharge into your sewer or other arrangement such as a tank under the garden.
The purpose of this page is to sew the seed in your mind that if you dig your basement another 2m deeper to put a big tank under the basement floor from which to pump foul waste up to your sewer occasionally, that the civil engineering difficulties and costs of excavating a total of 5.5m down from ground level could be considerable.
If you look carefully at the bottom of the image to the right, that is a digger digging deeper. The hole is supported by about £30,000 of temporary works piling and frame.
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It is often not appreciated, particularly by architects, that building site insurance policies normally limit cover to 3m deep only.
If your architect specifies a sump beneath the basement floor slab, the most risky and dangerous part of your basement construction will be without any public liability insurance, without any employees' liability insurance, without any insurance at all.
Are you prepared to accept those risks out of your own pocket?
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