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Be proactive in this. I wasn't and regret it.
Online planning portal should have anything external, internal is harder to pin down. You can always ping an email to the council planning department saying that you see works underway but can't find any details on the planning portal, what's going on? and in my experience they seem happy to inform. Apart from one shifty bit of development near me which they went quiet on, but I'm pretty sure that involved a sizeable backhander for someone to look the other way.
The council owned terrace next to our house (owner occupied) is undergoing some renovations, do I worry that they are going to mess about with the party wall? Who might I ask about the plans?