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It an old brick shed, so Idk how mortified you'd actually be.
A bit long but in the interests of crowd sourcing....
We've been here 8 years. Basically, the ground has built up, probably naturally over time. At some point some or part of the fence and concrete posts that would have been there were removed.
Issue 1: For some reason there is a section of brick wall missing from our boundary wall before the shed, in its place there is a wooden fence (yellow/brown on the drawing) that is fixed so it sits further inside our boundary and meets the building. Unfortunately this has meant that the neighbours built a slab butting up to it, which has a storage container thing on top. That slab acts to introduce moisture to the toilet section and obviously blocks access to the wall. They were okay with us having it cut back when we were looking at having a brick wall built to replaced the ropey fence panel, but that (stupidly) got put on the back burner due to cost. But to get proper access to the wall to create drainage and apply some sort of continuous external solution we'd need to trim that slab. From a relationship management pov I'd rather do that at the same time as the wall work.
Issue 2: for some reason, there is a concrete molded reinforcement that also sits above the dpm. It's hard to photo as it's behind a plant pot. That'd also need to be sorted. Which I could probably largely do from my side, but again would rather combine with one job if I need to access their side.
Also for people sceptical about the air brick the current reading is down to 79% after leaving the door open all morning and doing two tumble drying sessions.
How will a dehumidifier do anything except suck the water from next door's lawn though?
Also definitely not cheaper than chiroshi's £2 insect grills and some holes.