Hello,
My understanding is that Danske Bank (previously NIB) do not have a clause in their LTV Tracker Mortgage Documents, to trigger a request for a revaluation of your property. Someone here might like to correct me, but that is something I have been informed and I believe to be true.
I further do not think we are going to be asked by the State, to have our homes valued, as part of this new property tax - at least, not initially. Perhaps in later years, this will be requested of us, but for now I thought we were going to be asked to give our own opinion on the value of our properties (I expect, this to be the first step, to help get people to buy into the concept, then later the State can press for higher taxes from this source).
I would think a fair system for estimating the value of your house, would be the recently launched property register where we can see the sale price of recent houses on our roads etc - granted, this will not be appropraite for everyone, but it may be a reasonable place to start.