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Zillow Home Estimates seriously flawed


               
2011 Jan 3, 1:15am   2,348 views  6 comments

by TechGromit   follow (1)  

On occasion I view the Zillow's estimate of my homes worth, and firmly believe that there estimates are based on a percentage of market trends and nothing to do with actual house's actual value. Let me clarify there. Zestimate for my house is $342,500, Public Public Facts:
Sqft: 3050
Lot size: 114,127 sq ft / 2.62 acres
Property type: Single Family
Year built: 1990
Parking type: Garage - Attached
County: Atlantic
Exterior material: Wood.

Now let compare this to three neighbor's properties.

Zestimate $261,500
Public Facts:
Lot size: 287,496 sq ft / 6.60 acres
Property type: Single Family
Year built: 1989
Parking type: Garage - Detached
County: Atlantic
Exterior material: Wood
# Stories: 2

Zestimate $442,500
Public Facts:
Sqft: 2,950
Lot size: 261,360 sq ft / 6.00 acres
Property type: Single Family
Year built: 1997
Parking type: Garage - Attached
County: Atlantic
Exterior material: Wood
# Stories: 2

Zestimate $648,500
Public Facts:
Lot size: 261,360 sq ft / 6.00 acres
Property type: Single Family
Parking type: Garage - Attached
County: Atlantic
Exterior material: Wood
# Stories: 2

Based on public facts, there no way they can determine a high end home from a slum. Have a larger lot or more sqft. doesn't make your house more valuable. In short they are using the figure the house last sold for and using a percentage off to determine value. So say I paid 450k for my house instead of 400k, the house would be more valuable in zillow's opinion, cause the initial price was higher.

Also changing the house facts does nothing increase the value of property, I added 6 bedrooms, 4 bathrooms, upped the sqft. to 8,000 sqft. along with other upgrades for the hell of it and it changes the owners estimate none. Adding remodeling projects does increase the owner estimate appraisal, but it's all at cost of the projects. So assume you remodeled a bathroom (which I did) and do all the work yourself and it costs you $1,000, it makes the house worth $708 more, but if you pay someone 4k to do it for you, it's not 3k more valueable.

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4   EightBall   @   2011 Jan 3, 5:16am  

Zillow is worthless for price comparisons. Data disappears frequently (sale prices/changes) and is often wrong (property taxes, #bedrooms). Seeing the overhead picture and the SQFT is about all it is good for. It doesn't even reliably show homes for sale.

5   FortWayne   @   2011 Jan 3, 5:17am  

Zillow is just a website. Their numbers are purely advisory, not a real fact.

You shouldn't take every number on the internet as an absolute truth. For example property values are calculated by averaging house prices within 10 mile radius. But in Los Angeles you can go just a mile and move from a destitute neighborhood to a high end residence. One would cost a million a house, other they would pay you to live in.

Markets are not realistic, prices are not realistic, estimates are not realistic. The only thing that is real is what you are willing to pay for it. Go with that and that is how you will know.

6   Done!   @   2011 Jan 3, 7:41am  

On stats being misrepresented that is true.
My house is listed as a two bedroom when there's at least 4.
It also understates the sqft by a few hundred, where other sites overstate it.

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