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ouch indeed, there is at least some of that you can DIY though if you wanted to save money, digging out the concrete, stripping the plaster , even re-plastering is doable (I did our hallway)
Not 100% sure sealing is required unless the wall is below ground level? I'd get a second opinion on that.. if the concrete is what was causing the dpc to be breached that could be the all the fix to the damp issues.
Fucksake. Engineered wood floor in our basement (lower ground floor actually I suppose) kitchen/living room has been sinking for months... maybe years. Gap under the floorboards now well over an inch in places and the floor is bouncy. Water ingress and/or damp was diagnosed, leading to rotten joists.
Had a quote to lift and retain the floor, repair/replace the rotten joists and re-lay. The idea was to only do the front of the (knocked through) room as the kitchen at the back seems fine. They were going to cut the boards at the point the rooms were knocked through and put a threshold in to cover the join. £5k, so ouch but managemable.
Builder arrived this morning after i spend half the night clearing the room and shifting furniture. Turns out they can't lift and retain the floor as it's glued together and on removing (also rotten) skirting found that the damp extends a couple of metres up the wall.
New quote for new floor throughout plus stripping plaster, sealing and replastering and digging up the concrete floor outside the front and putting proper drainage in is £20k. Very ouch and very much not managaable. Insurance won't cover it apparently.
Balls.
EDIT: not DIY as such... just ranting. carry on.