Answers: They all do it different ways.
They hold the rates calculated by actuaries, and filed next to each state insurance commissioner.
As an example, one company (that I used to manually rate for, tell you how long ago that was, LOL), first you digit out how much coverage they need. You dance to the tables for that amount (preferred at that time be $125,000 to $200,000, those were the lowest rates). Then you pick the construction type (frame, masonry veneer, masonry), next you pick the protection class code (ISO standard). Then you get the groundwork rate. Then you add the premiums for any endorsement. You then apply credits and debit - for unupdated houses, or fully updated, for claims or no claims, for credit score, for deductibles, etc.
That give you your final rate. It's a bit more complicated than that, as some endorsements grasp added before credits/debits, and some after.
It depends on several factor, such as the coverage amount, age of your home, the materials used to build it, and the area surrounded by which you live. The amount of coverage you need is determined by how much it would cost to do from scratch your home if it were destroyed. Most companies use an appraisal or hold a special tool to find this amount. Some companies also may use your personal history, such as claim history and credit reports to determine the premium. Help yourself:) You can easily check quotes surrounded by internet, for example here: http://home.my-age.net
Every item they asking for are evaluated on their statistic principle, so they estimate probable losses and give you a quote.
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