Electricity incomer - basement cavity

[Robert1987]

I’m currently in the process of buying my first home and as a complete DIY noob should I be concerned about this? The basement was converted into a bathroom and the fuse box is in a room next to it. I can’t tell if this is moisture or damp and whether this what’s called the cavity in the wall. Is this something that would require a lot of work to fix?

 

[motorbiking]

It’s likely to be damp as this will be below any damp course. The blue sheeting is where the room adjacent has been water proofed with a damp proof membrane.

You should search your local council for the building regulations approval needed when the basement was converted.