We live in a 1930s ground floor maisonette with solid walls. We appear to have a severe condensation issue with water running down the 2 back bedroom walls resulting in thick black mould. We continually wash down with bleach and have repainted numerous times yet it regrows. We have a radiator in both rooms yet the walls are always cold and in one room wet.
To top it off we now have around 5 weed/plants growing through our skirting boards in the main bedroom. We are ground floor but I cannot see from the outside how or where they are getting in.
To be honest I don't know where to start and what trade to contact to help resolve this issue.... any pointers?
Thanks in advance!