Zillow's margin of error seems to be about 50% Back when I still owned three houses, judging by the sale prices on two of those, it was 50% under on one, 50% over on the other. It seems to me to be about right on the third.

Aside from that, 100k of appreciation tells us nothing. A 100k house appreciating at 1 to 2 percent per year will appreciate between 10k and 22k over ten years. A 500k house could appreciate 100k in 10 years at what is a relatively low rate of appreciation.

Now if you bought your house for 50k in 1999 and it appreciated 100k, that would certainly indicate either a bubble or the fact that you had some very interesting photographs of the seller.

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There is no more degenerate kind of state than that in which the richest are supposed to be the best.
Cicero, The Republic
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