Outhouse renovation

sounds like maintenance to me. and not an extension or any change. you are basically doing repairs and you are not increasing human occupancy (although perhaps the building was originally for human occupancy anyway which I would have guessed would probably cover you even if you were which you’re not)

Sorry to drag you back to the end of March, but If you fancy a bit of DIY, those green glass insulators make brilliant shades for internal or external LED lamps.

Nice work