Now where I am, many of the older homes are the exact opposite. RC can be twice as much as market value if not more. So many homes can be underinsured here if the agent is only writing to market value. Of course many companies also try and catch this with inspections and their own calculation of RC.
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So much this. I live in rural Iowa, houses sell for $30k-$60k, and the low end gets you a solid, unupdated house, the higher end, at least in two of the towns, gets you a nice home. I bought my 2 story, built in 1910, for $30,500. It's 9 foot ceilings on both floors, wood floors on a portion of it, and then we did a ton of updating. I doubt I have $50k in it, but replacement cost on it probably pushes $250k. That's why we insure for replacement cost and not market value.
In fact, we had a recent agency acquisition, and I bet we have increased dwelling coverage on 90% of the book, due to how poorly they were insured. The company they used didn't have any inflation guard, which certainly didn't help the cause.