gamblor956 34 days ago [-]
Zillow is not accurate at all. In my market, Redfin has been accurate to within 5% of the price, up or down. However, Redfin is a real estate agency, so they use their estimates and have access to data that Zillow doesn't, and they will adjust the algorithm at a neighborhood level.

Zillow is merely a real estate value estimator (they don't use sufficient data to earn the right to call themselves an appraiser nor do they provide sufficiently updated listings to justify calling them a listings service).

33 days ago [-]
BeetleB 34 days ago [-]
With Zillow, you can just track a home (don't recall how - maybe just "Save" will work?). You can have it periodically email you reports on the home, which will include the value estimate.
joezydeco 32 days ago [-]
Ideally, I want a report which alerts me when zillow modifies my home estimates.

So sign up with Zillow and "claim" your home, then subscribe to email updates. You'll get mailed weekly with your "estimate". Using quotes there because, like gamblor956 says, the values are complete bullshit.

mooreds 34 days ago [-]
I am not aware of any services but they have an API. I think it'd be skirting the tos to save it, but if this is just for personal use it might be ok.

https://www.zillow.com/howto/api/HomeValuationAPIOverview.ht...

mooreds 34 days ago [-]
As far as general tracking of avms I don't know of any and the incentives are not properly aligned to have them set up (avm provider doesn't want to show inaccuracies).

Zillow used to show percentage error but it was a web page showing inaccuracies by zip.

sdsdsdsdsdsds 34 days ago [-]
I agree with the incentives part. But, apparently, some AVMs(not necessarily Zillow) are used by mortgage lenders to adjust their risk models. In such cases, I would assume lenders will first want to find out information about accuracy(through third parties).

You are right that zillow used to show accuracy by zip code. But I am looking for more granular info.

mooreds 34 days ago [-]
Sure, I bet the AVMs share their accuracy to people that pay them, but I bet not to folks who don't (consumers).

Anyway, hope this post turns up some useful info.

itsdrewmiller 34 days ago [-]
Zillow will give you monthly updates on their estimate of your house, and they show a history of their estimate when you drill into a house. When I listed my house for sale last month their estimate shot up immediately to closely match the offer price, so worth being skeptical.
bsvalley 34 days ago [-]
You could build a simple web crawling tool pointing to the URL of your house on zillow or redfin (trigger it just once a day).

Zillow estimate is way off by the way...

chrisgoman 34 days ago [-]
How much are you willing to pay? Are you expecting this to be a free service? There is a company called Altos Research