How-long-is-a-piece-of-string question. Costs will be determined by a) cost of labour where you are b) what the existing floor/subfloor/subsubfloor is made of.
I hadn't heard of one until reading this post; 1.5m seems a bit narrow to me, but I suppose it depends how close you want to be to those you're conversing with.
It would be a dam sight easier in a Victorian house with a big void beneath wooden floors.
My house is 50's with a concrete floor under parquet, meaning DPC issues
Basically, your house is built on a concrete raft. (Probably)
To prevent damp entering the house, concrete is poured, a large polythene layer is added, and more concrete- think of it like a pond liner in reverse
If you dig below a couple of inches, there may be pipes/ insulation and eventually the barrier that prevents moisture coming into the living room. You would need to line the pit- or end up with a possible pond
If those dimensions are for the finished pit then the hole will have to be a good bit bigger, to allow for the pit lining.
Do people still have conversations where you live? I thought all communication was done by text messages on mobiles these days .
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