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Thanks, though the boards definitely haven't dropped. My best guess is it was a half assed extension in the 1930s. The house is built into a steep hill, they added 2 meters to the kitchen then at a later date added another utility room behind that but dug even less deeply so it's accessed by a couple of stairs that go up and are covered in the same concrete. That utility room appears to be separated by a thin layer of plasterboard and not much else from the earth behind it.
I can't quite fathom why the concrete is wonky though (steep at one side, shallow at the other), surely it wouldn't have been set at that angle. But it's definitely not level and the boards are solid/level.
Looking half seriously at hiring a breaker...
CYOA-
hmmm... if the boards are level and the concrete is wonky, then making the entire floor level is going to be tricky without either removing the concrete and re-laying it level with the boards, or battening the whole lot out and laying a new chipboard floor over the top. obviously it's going to raise the floor though...
depends how level you want the floor to be.got any photos?
bigshape
which bit is level? the concrete? if so the floorboards may have dropped.
are any of the boards loose so you can lift them and see what's underneath?
probably worth investigating the root cause of why they are lower than the concrete section before trying to make the floor level.