Regarding the cables, it looks to me like many of them will be 50mm below the finished wall surface in which case it's safe to run them there according to the regs.
Nice job.
I may have a side extension soon however I have two manholes.
May i ask, In your early photos I,m sure I see a manhole, how did you tackle that and I know its early stages but do you have a plan on finishing the floor with regards to your manhole.
Look forward to seeing more of your project, thanks
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