I do not know whether IO visited your home/neighbour every year of extension. My wife and I are the only persons living in my house. We might not be available all 30 days during consideration period to face IO unless IO make appointment in advance. Usually they do not prior alert.
Companies worked with past 20 years handled my visa and work permit. Last year (1st time) I did it myself. I will be quite busy next few months. My wife and me might not able to be present at home while IO visit my home for inspection. Iām have sufficient 400k savings, Yellow book and other docs. Thus I was thinking to use an agency service. So I do not need to worry about IO visiting my house. IO never inform you in advance.