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Hi troop,
We recently had the wall between a bedroom and its dressing room opened up (our son didnt require 4m of hanging space!!!) - and concerningly, found deepish water inside the cavity wall.
The house is on a slope. The bedroom subfloor (rock) is permanantly wet with little puddles.
The diagram shows all the relevant info - what would you do to solve this?
Hi JacobZ - thanks for your reply
Here's a photo of the subfloor.
We have put a pipe into the cavity wall to drain it
And have used an angle grinder to guide any water under the bedroom towards an exit too.
Just so you can find your way around, the top of the picture is where the water-filled cavity wall is. Right of the picture is the side wall of our house, so we can drain to there.
This is the wall between the bedroom and walk-in wardrobe being removed recently. The problem cavity wall is at the bottom there - the yellow ended prop is touching 'problem wall' (as we call it!!)
You guessed it - the walk in wardrobe is an add on. To be honest, the whole of this floor, under the original house, is probably an add on. I'd like to actually get some original plans for the house - do you know where I get those from? Council?
We've actually done a whole load of excavation - we've done an AGI drain across the front of the house (the uphill) - about 1m away from the front of the house.
We've also dug away the soil that abutts the house at the front (uphill side), and applied DRYZORO to the brickwork, down to the footings, and coming up 2 brick courses above the DPC. We will put an agi drain there, and blue metal gravel.
We've done the same along the side of the house - a full length trench, DRYZORO Same going here - megaflo agi drain, and blue metal gravel.
The fake grass is just to stop the soil falling in
We have made the trench at the side carefully fall in gradient - we've used concrete (plus dryzoro) to smooth out any dips.
Thanks Dave - we just bought the house, and budget really doesn't allow for professional help sadly.
The timbers are actually in good condition.
The hallway to this room and the bedroom next door had timber joists that needed replacing - but bone dry floors.
The garden store floor is just soil - so we can dig there. I think we'll come to water once we get to the same level as we found water in the cavity wall. Do you think it's just the level of the water table??
Since my first post, we've been busy slicing viewing holes the size of a A2 sheet of paper out of the nice concrete base of the dressing room and digging down - we've found water about 70cm down in all of these.
Our current plan is to check out an old ceramic drain pipe that cuts across the house at about this position (we can see one end of it in our garage...so we're going to buy a drain inspection camera to take a look in the pipe.
It' been fed water from a leaky carport for some time (which we have fixed) - but we fear the water has been trapped and had nowhere to go...
I'll update
Many thanks alll - so far!! 
The pink lines are the trenches we have dug. Where next to a wall we have done dryzoro.
The blue circles represent the viewing holes we've done with an angle grinder in the concrete base for the dressing room. Water below each.
The problem cavity wall is between the dressing robe and bedroom 3.
The green circle shows the location of an old ceramic drain we have found and we can see it curves in the direction of the arrow.
As I said above - we think this might be a good next step to investigate - as it was previously receiving water from the leaky carport (above the workshop and store). Maybe it is broken and the water it was carrying has just spilled out under the middle of our house for years.
Any and all suggestions for next steps welcomed!! Funds don't allow for professional help sadly.
