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NFT: How Accurate is Zillow?

Samiam : 5/20/2015 5:46 pm
I'm hoping some people who know much about real estate can comment. I checked a few houses that I know pretty well and the estimates for the values was either way higher or way lower than I would have expected but I am no expert. Other people I know swear by it. Hoping to get some good information on how accurate the home estimates are.
Not 100% accurate  
pjcas18 : 5/20/2015 5:52 pm : link
but a data point.

It's like the PFF of real estate.

My loan appraisal wasn't exactly like the zillow estimate, but it was close enough to help us do our shopping.
They  
Chef : 5/20/2015 5:59 pm : link
really under valued my house last time I looked.. I laughed...
No idea - It's a guess IMO  
Giants2012 : 5/20/2015 5:59 pm : link
Today, real estate is only worth what somebody is willing to pay for it and what your taxes are based on the mill rate.

In addition  
Chef : 5/20/2015 6:00 pm : link
their property description of my home was inaccurate as well
The Estimated Prices on Zillow have a few factors  
NYG27 : 5/20/2015 6:00 pm : link
First, they factor what your house has on Public Record, with square footage, bedrooms and bathrooms factored in. For example, similar setup to my house right next door is estimated by Zillow for $9k more then mine. Only difference between the two houses, is that other house is a rental property and list a higher square footage (counting basement sq footage, as we don't) so it has a high estimated price on Zillow.

Second, they also factor the SOLD prices of houses that just recently sold in your relative surrounding areas. As an example, the last two months, Zillow's estimated price has increased in our house by $14k. When I look into public records why Zillow did that, I see recently sold similar houses in our neighborhood that bumped the estimated price of our house the last two months.
Their numbers...  
Ryan : 5/20/2015 6:02 pm : link
...are pretty raw and tend to be mathematical (based on county records and recent activity in the area) and lack some of the subjectivity that an accurate appraisal requires.

It's a good ballpark based on average cost/sq ft of a given area but they won't take into account features that aren't quantified in public records. Example - two houses in the same development that are of similar size will have a similar estimate, even if one is all original features and needs updating, while the other has a number of updates ( remodeled kitchen, new systems, better lot location).

I'm not sure it takes into account special circumstances around recent sales either. In our small neighborhood we had, in a matter of about 9 months, 2 short sales and 2 quick cash out "sales" due to divorces all of which reflect less than market value. Our estimate absolutely plunged (about 15%) over this period.

Zillow is terrible  
rdt288 : 5/20/2015 6:02 pm : link
I'm in real estate. It is such a disservice to the public w its stale listings and dumb algorithm
I don't find it all that useful  
Mike in NY : 5/20/2015 6:04 pm : link
Use your local mls to see comparable active listings and then if you use redfin for those listings it will give recent nearby sales and you do the math
Another point about Zillow and other sites  
NYG27 : 5/20/2015 6:11 pm : link
All these "Real Estate" apps/websites pull their data from real time agent listing sites, as an example in the Washington DC area, they pull from MRIS (Metropolitan Regional Information System).

Zillow, Trulia, Redfin, Realtor, Estately and other sites have filters setup with real time agent listing sites where they pull in Data Dumps. Sometimes these sites pull in new info every 12-24 hours, at times it could take 2-3 days.

There have been several times where I saw a house listed on Zillow as "One Day" and I go to see that house that same day only to find out 10-15 different real estate agent cards on the counter because the house was listed in real time 3-4 days before Zillow updated their site.

Other times, Zillow doesn't have a lot or any pictures of a new listing but if I go to another site, I see 25+ pictures of the house. I have noticed Zillow is slow to pull down pictures in their date nightly data dumps on new listings.

Good luck and use more then one of these sites at the same time. Don't put all your eggs in the Zillow basket.
RE: They  
schabadoo : 5/20/2015 6:23 pm : link
In comment 12295063 Chef said:
Quote:
really under valued my house last time I looked.. I laughed...


Don't most people think this about their homes?
Part of the estimate is based on real estate taxes  
WideRight : 5/20/2015 6:32 pm : link
So prone to errors both. Under taxed => undervalued. Over taxed => overvalued. This is of course relative to the other houses in your neighborhood.
RE: RE: They  
Chef : 5/20/2015 6:33 pm : link
In comment 12295093 schabadoo said:
Quote:
In comment 12295063 Chef said:


Quote:


really under valued my house last time I looked.. I laughed...



Don't most people think this about their homes?


Indeed, however this is true in my instance and I also do not think that distressed "sales" should be used in the value equation. I also offered that they were not representing my property accurately...
RE: Part of the estimate is based on real estate taxes  
pjcas18 : 5/20/2015 6:38 pm : link
In comment 12295106 WideRight said:
Quote:
So prone to errors both. Under taxed => undervalued. Over taxed => overvalued. This is of course relative to the other houses in your neighborhood.


I thought their "zestimate" was based on comparable sales, local "square fit' estimates, etc.

I've never heard it based on real estate taxes which seems arbitrary.
not accurate  
markky : 5/20/2015 7:05 pm : link
in my neighborhood the zillow estimates are about 75-80% of what houses are actually selling for.

also, houses come up on zillow a few days AFTER they come up on Redfin.

Redfin also has more information. for example, it has tax info, whereas zillow has tax info some of the time.
RE: No idea - It's a guess IMO  
baadbill : 5/20/2015 7:32 pm : link
In comment 12295064 Giants2012 said:
Quote:
Today, real estate is only worth what somebody is willing to pay for it and what your taxes are based on the mill rate.


Today? You mean there was a time when this wasn't true?
Gawdawful bad.  
Red Dog : 5/20/2015 7:43 pm : link
A while ago I took a look at some listings for the area where I grew up.

Their information on schools was seriously incorrect because they did not differentiate between the city and the township of the same name.

What they had was seriously incorrect and totally misleading.
very  
blue42 : 5/20/2015 8:12 pm : link
inaccurate....my house is still listed with pre-expansion sq footage. Added on in 2005.
sam, for  
Randy in CT : 5/20/2015 8:21 pm : link
what purpose? A house can sell for whatever a buyer is prepared to spend (etc).
Very, very inaccurate  
River Mike : 5/20/2015 8:58 pm : link
I went to the bank to apply for a homeowners line of credit. The loan officer pulled up Zillow on the computer and gave me an estimated value of my house that was about 30% below what I expected. I told her to send an appraiser out to my house. The appraiser came back $50,000 more than what I thought it was worth. Zillow wasn't in the ballpark.
I'd say generally they're pretty accurate,  
MOOPS : 5/20/2015 9:38 pm : link
but I've seen instances when they're off by hundreds of thousands. They are not foolproof.
I have seen in some cases they were close and in others way off  
steve in ky : 5/20/2015 9:48 pm : link
I certainly wouldn't use this as any real guide if either selling or buying.

I do think however the price and listing history section can be helpful.
I sold my house and bought a new one 2.5 years ago  
GentleGiant : 5/20/2015 9:56 pm : link
My original house was valued at about 25k less on zillow than I got for it. The house I bought was valued at 53k more than I paid for it. 3 months after I bought the house Zillow valued my house exactly what I paid for it. So what I took from that experience is a Zillow estimate is anywhere +/- 5Ok.
As others have said, it is a data point. Nothing else  
Mike from Ohio : 5/21/2015 11:19 am : link
I would strongly advise not putting any significant weight on a valuation from Zillow or any similar site. The Zillow numbers are based on mathematical formulas that consider price per square foot of homes sold in the immediate area, as well as the price of land. What is can't accurately consider is the finishes and upgrades any house has that can greatly alter the price per square foot you would get in a sale.

If you are talking about a subdivision where the houses were all built around the same time and are roughly the same size, the estimates are probably more accurate. If you are talking about an area where multiple builders build and sizes vary widely, the estimate becomes much less relevant because price per square foot varies significantly from one house to the next.

In our neighborhood we are more the latter - multiple builders with varying size lots. Houses are also largely just past the 10 year point, where people are starting to do significant upgrades inside. Zillow has no visibility into any of that, so it is not factored into their estimate, but would absolutely be factored into what you could get for the house.

If you want to know what you can accurately sell your house for, call 2 or 3 real estate agents with experience in your neighborhood, and have them work up estimates. That will be much more useful than Zillow.
RE: Very, very inaccurate  
Mike from Ohio : 5/21/2015 11:21 am : link
In comment 12295354 River Mike said:
Quote:
I went to the bank to apply for a homeowners line of credit. The loan officer pulled up Zillow on the computer and gave me an estimated value of my house that was about 30% below what I expected. I told her to send an appraiser out to my house. The appraiser came back $50,000 more than what I thought it was worth. Zillow wasn't in the ballpark.


I'm guessing that was just a rough estimate as opposed to an actual loan request? If your bank makes lending decisions based on Zillow it will likely not be around much longer.
RE: In addition  
giants#1 : 5/21/2015 11:23 am : link
In comment 12295066 Chef said:
Quote:
their property description of my home was inaccurate as well


That's likely why the estimate was way off. You can edit the description and they'll automatically update the estimate.
RE: not accurate  
spike : 5/21/2015 11:27 am : link
In comment 12295146 markky said:
Quote:
in my neighborhood the zillow estimates are about 75-80% of what houses are actually selling for.

also, houses come up on zillow a few days AFTER they come up on Redfin.

Redfin also has more information. for example, it has tax info, whereas zillow has tax info some of the time.


redfin has the best and updated info. I searched there all the time during my home search
RE: Zillow is terrible  
Giants2012 : 5/21/2015 11:33 am : link
In comment 12295071 rdt288 said:
Quote:
I'm in real estate. It is such a disservice to the public w its stale listings and dumb algorithm


Correct - if a house in close proximity refinances a note which is far less than the actual value of the house, Zillow includes the refi dollars in the algorithm as the actual value of the house which effects all the homes within that proximity.
not sure about accuracy  
mfsd : 5/21/2015 1:45 pm : link
but there sure are good at making painfully sappy commercials
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