Accurate Home Valuations: Assessing Online Estimates (2024)

As technology becomes more advanced, the rules of real estate continue to change. I remember back in the day when Google Earth first became a thing. Agents were freaking out because they could look up properties and see them from the sky. It was the coolest thing and made us all feel like we were undercover spies, like James Bond.

Today, we have other innovations that have propelled us into new territories. With the advent of new technology comes new ways that agents have to adapt, or improve.

One of these key pieces of technology is the online home estimate or valuation.

Made popular by sites such as Zillow, Redfin, and Trulia, online estimates seek to provide the real estate client with what their home is worth. The convenience is undeniable, but the same can’t be said about the accuracy.

These sites became popular for homeowners who are just beginning their home sale process. Someone gets an idea to sell their house, and they just want to “check the market.” After the 2008 market collapse, it’s not uncommon for people to want to know how the market is doing before seeing if it would be wise to buy or sell.

There is no question that these are very popular sites and they are very good for searching for homes that are available for sale in your local neighborhood. Here is the problem, however, with these sites.

All of these websites have an algorithm and they determine the value of your home based on price per square foot in the area. Sounds simple enough, right? What could be wrong with this?

Well, a lot actually.

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Why They Aren’t Always Correct

Reason 1: It’s Automated

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The data is uniform and isn’t actually based on a carefully put-together appraisal based on anything “tangible.”

It’s not as if there are thousands of little drones all equipped with Artificial Market Intelligence sweeping through each property and generating some sort of educated estimate. Automated systems are responsible for generating a predictive estimate all on their own without any oversight from humans with market knowledge.

Keep in mind, this computer-generated software isn’t looking for future movements. So anything that is going on off market in your area isn’t going to be covered.

The computer’s prediction isn’t focused on any hard and fast data, other than patterns.

Again, this article isn’t intended to denigrate these easy-to-use services, I just wanted to lay out the facts for future home buyers and sellers who may be reading this so that they are aware of the how these systems work.

A real estate agent is always going to be the best bet for clients who want to know the ins and outs of the market in question.

Automated data and generalized findings aren’t the surest paths to getting a proper estimate.

Some would argue that consulting these services actually does you a disservice.

Proponents of this thinking claim that by skipping agents and going straight to online estimate tools, clients may have inflated numbers in their heads. Since this is their first impression of the market, it can leave clients feeling misguided. This can also set you up for huge disappointments down the road when your agent tells you that you aren’t going to be getting an unrealistic fairy tale price for your home.

Reason 2: They Look for Patterns

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These services rely heavily on computer algorithms that have been pre-programmed to scour data and look for patterns.

Operating a system of predictions based on patterns seems like it would be a good idea, and in theory, it seems very sophisticated, at least on the surface.

However, one of the major things to consider is that real estate isn’t just a system of patterns and fluctuations.

It isn’t as cut and dry as certain aspects of the financial world.

There are obviously patterns and predictable fluctuations, but these happen based on aspects of the market that typically aren’t perceptible to a computer program.

When you consider that the value a house has changed over time, computers who are looking for patterns may be able to make sense of data, but they are relatively poor judges of which data is most important in the sale of real estate.

In order to be able to truly read a pattern, you need to have years of experience with markets and have some knowledge of predictable trends that occur throughout time. Without this background information, it can be really hard to understand what is going to happen--even for a computer.

Here’s why.

Let’s say your home is a gorgeous brand new colonial mansion with all the finest finishes and all the most modern conveniences. Imagine your home is going for close to $2,000 a square foot and you have 5000 square feet. You at 10 mil now. Let’s say your neighbor has 5000 square feet as well, however, their house is a dump. The computer does not know your neighbor's house is disgusting. So it’s going to possibly calculate the value there as well at 2000 dollars per square foot (especially if most of the houses in the neighborhood are gorgeous and going for this price) and then guess what… now that homeowner thinks he has a 10 million dollar palace when in reality it may be a 5 million dollar tear down at best!

Here’s where it gets even more complicated.

All of these websites take one ZIP Code and average out the price per square foot for the entire ZIP Code. This is what confuses buyers and sellers on the valuation of their homes, and one of the reasons you must be extra careful using online sites such as these.

These websites are not run off of comparable sales that have been examined by the human eye. They are simply priced per foot within a location and it’s put out by the computer.

You can not compare the price per square foot of a house on the 500 blocks of Rexford with a house on the 900 blocks of Alpine just because they share the same zip code! That’s how these websites work.

They take a zip code and they take an average. Forget about what I said above where a neighbor's house is worth 2000 dollars a square foot and another neighbor thinks his house is worth that as well because it’s on the same block… we haven’t even gotten that specific because these websites may be calculating every house in the entire 90210 zip code at 1500 dollars a foot for example just because that’s the average price between south of Wilshire and north of Sunset which is absolutely ridiculous. It’s taking the average price per foot of homes from 3 million to 100 million dollars.

Reason 3: They Can’t Account for Unique Property Values

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A computer-generated system also won’t know that your house has emotional value. And sometimes, you as the home buyer or seller won’t know this either.

It always surprises me when a client believes that just because their house has the same number of beds and baths as the house next door, that they will be worth the exact same price.

Even if you live in the same neighborhood, houses can have widely different qualities that make the price of the home differ substantially.

When using the computer’s algorithm, it can’t input a price adjustment for special amenities, or spectacular features.

Online estimate leader, Zillow even explains this on their website where they state:

“ We do not know about home values and remodels unless they have been reported to the local tax assessor, so those values are not used in Zestimate calculations.”

Other factors such as your gorgeous skyline view, for example, will not play a factor in determining the estimated price.

Getting a great estimate is as simple as picking up the phone and calling a real estate agent.

I like these websites, for searching for homes that are available. However, I recommend being careful because they are usually incorrect when determining the value of the home.

The Fate of the Agent and Online Estimators

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I honestly don’t believe that these types of online services were meant to detract from an agent’s job. In fact, I think it actually does the opposite.

Zillow CEO, Spencer Rascoff, had this to say, “you need a real estate agent, regardless of whether you’re a buyer or a seller. It’s an infrequent, emotional, complex transaction. Having a great person at your side can be really valuable.”

From a practical standpoint, these tools help visitors to come to a website, and it is a very attractive idea.

However, once they do a little playing around and realize that the numbers are way off they will want to consult a professional as CEO Spencer Rascoff suggests.

Accurate Home Valuations: Assessing Online Estimates (2024)

FAQs

How accurate are online home value estimates? ›

Online home value estimates can provide a general idea of a property's worth, but they are not infallible. These estimates may not consider unique features or condition-specific details. It's best to use them as a starting point and consult with real estate professionals for a more precise evaluation.

Which online home value estimator is most accurate? ›

Zillow offers one of the most accurate estimators overall. Being one of the top real estate sites on the internet, Zillow has a very accurate estimator that has helped many people in their journey to sell their homes. Most people turn to Zillow for all of their real estate needs.

Which online valuation is most accurate? ›

Here's our top 10 list of free online property valuation tools (UK) you can use to get an accurate home valuation.
  1. YOPA. ...
  2. Zoopla. ...
  3. Rightmove. ...
  4. Onthemarket.com. ...
  5. Mouseprice. ...
  6. Land Registry (for Wales and England) ...
  7. Register of Scotland (for Scotland) ...
  8. Nationwide.

How do you accurately determine the value of a house? ›

Let's look at four strategies you can use to accurately determine your home's current value.
  1. Use Online Home Valuation Tools. One of the easiest ways to estimate the value of your home is by using an online home valuation tool. ...
  2. Hire A Professional Appraiser. ...
  3. Consult A REALTOR® ...
  4. Pull 'Comps' On Similar Properties.

Why is Zillow estimate lower than Redfin? ›

Both Zillow and Redfin give homes an approximate value, but the Zestimate provided by Zillow has proven slightly less accurate than Redfin's estimate. Final numbers depend significantly on the local market and demand for a property in your particular location. So, an estimate truly is a roundabout valuation.

What is the accuracy of Zillow estimates? ›

How accurate is the Zestimate? The nationwide median error rate for the Zestimate for on-market homes is 2.4%, while the Zestimate for off-market homes has a median error rate of 7.49%. The Zestimate's accuracy depends on the availability of data in a home's area.

Is Redfin more accurate than Zillow? ›

Based on company data, Redfin Estimates are generally more accurate than Zillow Zestimates. Redfin has a median error rate of 6.43% for off-market properties, while Zillow is at 7.49%. To put Redfin's 6.43% error rate in perspective, a home with a $300,000 value estimate could really be worth $281,000–319,000.

How accurate are Redfin estimates? ›

The Redfin Estimate is highly accurate, with a current median error rate of just 2.03% for homes that are for sale, and 6.35% for off market homes. This means that when a home that is currently on the market sells, the Redfin Estimate will be within 2.03% of the sales price half of the time.

How accurate is CoreLogic valuation? ›

As a leading real estate data provider, CoreLogic has access to a wealth of data sources to drive greater valuation accuracy and consistency. Our property database spans 5.5B+ records and 99.75% of the data we collect comes directly from the source to ensure that our AVM data set is universal and complete.

Which property valuation method is best? ›

Cost Approach to Value

It is the most reliable approach for valuing unique properties. The cost approach provides a value indication that is the sum of the estimated land value, plus the depreciated cost of the building and other improvements.

What is the most accurate valuation method? ›

Discounted Cash Flows

This technique is highlighted in the Leading with Finance as the gold standard of valuation. Discounted cash flow analysis is the process of estimating the value of a company or investment based on the money, or cash flows, it's expected to generate in the future.

Which valuation method gives highest value? ›

Revolutionize Your Approach to Which Valuation Method Gives the Highest Valuation. The Discounted Cash Flow (DCF) method often yields the highest valuation. It projects future cash flows and discounts them to present value. To maximize business potential, understanding various valuation methods is crucial.

What is the #1 thing that determines the value of a home? ›

Location is the cornerstone to a home's value. You can modify a house to fit your needs, but the location will always stay the same. The location of a home and its proximity to desired resources are often the most important deciding factor for a buyer.

How can I increase the value of my home by $50000? ›

Home improvements that improve value can include:
  1. Landscape Layout. Landscaping should be welcoming, well-kept, and easy to maintain. ...
  2. Front Door Updates. A fresh coat of paint or modern door style elevates the entryway.
  3. Outdoor Lighting. ...
  4. Driveways and Walkways. ...
  5. Replace the Garage Doors.
Jan 9, 2024

How do you determine what the property value is worth? ›

The appraiser or assessor analyzes real estate transactions that occur within a community and determine the factors that lead to the final sale prices.

Why is Zillow Zestimate not accurate? ›

This means that it may not take into account certain factors, such as renovations or additions to a home, that could affect its value. Additionally, Zillow's algorithm may not be able to accurately account for variations in local markets, leading to differences in the Zestimate between homes in different areas.

Is zestimate or Redfin more accurate? ›

Based on company data, Redfin Estimates are generally more accurate than Zillow Zestimates. Redfin has a median error rate of 6.43% for off-market properties, while Zillow is at 7.49%. To put Redfin's 6.43% error rate in perspective, a home with a $300,000 value estimate could really be worth $281,000–319,000.

Why are Redfin and Zillow estimates so different? ›

Redfin says it only provides a Redfin Estimate if there are “enough similar properties sold nearby within the last year.” Zillow, on the other hand, says its Zestimates “rely on much more than comparable sales in a given area.”

How accurate are Trulia and Zillow estimates? ›

How Accurate Are Trulia Estimates? Trulia Estimates are identical to Zillow Zestimates because both websites use the same data. The only difference is that Zillow Zestimates show both on-market and off-market properties, but Trulia only shows off-market estimates.

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