My limit goes up every year. Is it right?
It is adjusting, which is not the same as being accurate. Inflation guard applies a set percentage; construction costs do not move in set percentages. After a decade or more the two can be well apart, and a renovation makes the gap larger again.
I remodeled the kitchen. Does my insurer need to know?
Yes. It raises what rebuilding the house costs, and the policy only knows what it has been told. It is also frequently a reason for a better rate on updated plumbing or electrical, so it can cut both ways in your favor.
What happens if my dwelling limit is too low?
On a total loss you are short by the difference. On a partial loss some policies apply a coinsurance penalty and pay proportionally less, which surprises people who assumed being under-limit only mattered in a catastrophe.