Zestimate guide
Why did my Zestimate drop overnight?
A sudden fall almost always traces back to one of three triggers. Here’s how to find yours — and whether it’s your home or the model.
A Zestimate that drops thousands of dollars overnight feels alarming, but it's rarely random. It almost always traces to one of three triggers — and you can usually figure out which.
The three triggers
- A new nearby sale became a comp. A recent sale got added to your comparable set — even if it isn’t truly comparable, or sits in a different neighborhood or town.
- A fact about your home changed. A correction, a tax-record refresh, or a data sync altered your square footage, beds, or lot — and the estimate followed.
- The algorithm updated. Zillow periodically changes the model itself, which can reprice whole regions at once, with no notice.
How to find which one hit you
- Open your Zestimate history and note the exact date it dropped — the timing is your biggest clue.
- Look at sales recorded near you around that date. A new, lower, or non-comparable sale is the usual culprit.
- Re-check your home’s facts for any change.
- Compare against Redfin and Realtor.com. If only Zillow dropped while the others held, this is a Zillow-specific data or comp issue — not the market.
What to do about it
If a bad comp or a wrong fact caused the drop, you can fight it: document the right same-municipality comps, correct any data errors, and report the bad inputs. Start with cross-town comp drag and the correction guide — or run a free audit to pinpoint the trigger in one pass.
Audit your Zestimate — free.
Run your address through an independent audit. We check the facts on file, compare every public AVM, and run ClearComp™ to show whether out-of-town comps are dragging your number — in plain English, no sign-up.
Run my free audit →Frequently asked questions
Can a neighbor’s sale lower my Zestimate?
Yes. If a nearby sale is treated as a comparable — especially a low or non-comparable one — it can pull your estimate down, even if that home isn't truly like yours.
Will my Zestimate recover on its own?
Sometimes, as newer and better comps come in. But if the cause is a wrong fact or a persistently mismatched comp, it may not recover until you correct the underlying input.
Does Zillow tell you when it changes its algorithm?
No. Model updates can reprice your home and your region without any notification, which is why a sudden change with no local sales is often an algorithm update.