Hi all, Really looking for some advice and freaked out we have made a gigantic mistake. We completed on our first home today and as we were moving in I noticed that there was some damp on the extension wall that I didn’t see mentioned on the survey (we paid for the best survey available). I’ve since gone back and re read it this evening, and I feel like a complete idiot as I missed the fact that extension is single skinned!!! Now It is just a garage, utility room, downstairs shower room and a small room called the ‘garden room’ nothing like a kitchen or bedroom, and our surveyor did not mention it as an issue on the survey (on a scale of 1-3, 1 being no problem to 3 urgent it was rated a 1) but did say about adding cavity insulation in future as some damp and condensation is to be expected. I believe it was built like as they didn’t get permissions (it’s 18 years old) and we have indemnity insurance in place because of it. BUT im now completely panicking that we’ve made the rookiest of errors and will be saddled with an unsellable money pit. Does anyone have a ball park for how much it would cost to fix and if it’s worth it? The rooms will be storage mostly other than the shower room. I was gonna have a little bar in the garden room but I’m unsure now. Any help massively appreciated!