Awful condensation!!

[Coconutter]

I am at my wits end with condensation on the windows. It happens a little bit in all the rooms, but nothing major and wipes off easily. However, our bedroom and the living room (directly beneath it) are awful - regularly can't see out of the windows all day, and the mould has now spread to the bedroom curtains. I can't have the nets up in our room as the wall went spongy so the hook won't stay in. I have tried keeping the windows shut all day and night, keeping them slightly open all day, had a dehumidifier on all day... Nothing is working! It can't be healthy and I don't know what else to do

Kitchen not damp at all - we have laminate so can't check underneath. Don't know where meter is so will have to ask when DH gets home! Pretty sure the concrete floors are original (1970s).

sorry, I thought yours was the 1890s house.

1970's. So I expect the incoming water main will be black plastic where it comes to the internal stopcock.

It's a Karcher window vac, currys, amazon etc sell them.
They are fab for condensation, it's got to be better poured away then wiped away.