sorry - really don't have time for a bug report - so posting what happened to me here.
I had 2 accounts and use both regularly (accessing houses as well), about 3 1/2 weeks i logged into both accounts houses, a couple days later my power supply died. I was waiting for a new one which took 3 weeks; after about 2 weeks into the wait I received a demolition notice for 1 of my 2 accounts. Lucky my part arrived and I logged in to stop the destruction of my house. so in summary:
I received a notice even though I was only inactive for approx 3 weeks 21 days
Notice only came for 1 account and not both, even though both were inactive the same time
The house that received the notice was a personal one - the other account has a fc house and received no notice.