Housing evaluations are very straight forward -- the market is what decides the price. Unless your house is something exotic like a castle or something. Every year the city or region you live in has a process to evaluate this value, and then asks you to pay a tax based on this. Generally if you feel the taxation is unfair, you can just sell the house -- if it doubled in value from the year before, according to the market, you'll probably be happy to pocket that profit. Otherwise property taxes are just how it goes when you're a house owner. Also you normally have a year to pay the tax, so there is lots of time to make a decision.