Assessed market value and replacement costs are two different things. It's not just materials cost, but every other expense a contractor faces has gone up too.
Even if you just went by market value, housing prices have soared in the last 5 years.
My home insurance has gone up maybe 20% over the the 18 years I've had this house (and part of that is that I increased coverage at one point).
I'm done with independent agents. I've gotten jerked around more than once by them and the small potatoes companies they represent. Never saw any meaningful savings going thru them, and at least in my experience the customer service sucked. The big boys have a brand to protect, Acme Fire & Life not so much.
Another vote here for State Farm, had them for 20+ years. My auto rates have actually gone down over the last 3-4 years. Maybe it's different here since my state doesn't require you to have it. Don't states that DO require auto insurance have an agency that sets rates?