STEP 8 – TO SELLING YOUR HOME – IS ZILLOW ACCURATE?

Andi • February 12, 2020

You see a home on Zillow or the like (we’ll call them portals from here on out) and inquire about its availability with us…and it’s not for sale. You’re looking to sell your home and you LOVE the Zestimate (I don’t need to talk to anyone to find out how much my home is worth; squeeee! And even better my home magically increased in value by $50K in the last two weeks according to Zillow; double squeeee!), yet the number is completely wrong when you talk to a REALTOR®?.

Why?

Let’s start with the availability of homes part. The dirty secret about online real estate is that it’s built upon you being a lead. For that reason there is a war being fought between portals like Zillow and local real estate brokerages for your name, number and email address with some brokerages withholding their listings from portals with the hope of you browsing a local real estate brokerage’s website and inquiring with them directly instead. As the Seller, you are caught in the middle of an online bruhaha that has led to the mess that is the online real estate world which is inaccurate and untrustworthy with no online entity truly in your corner. For this reason, portals don’t care about their data being accurate; they are an advertising website not a real estate website so there’s no incentive for them to make sure that home that sold six month ago is changed from active to sold on their website. They just care about getting your contact information.

Now that you know that the baseline of portals is garbage, let’s move on to estimates of home value. First of all, Zillow itself calls it a “Zestimate,” as in estimate. Zillow has a helpful chart  which can be seen below showing that in the Seattle area the Zestimates are off by 9.8% on average. That means on a $500,000 home the Zestimate could say it’s worth either $450,000 or $550,000. That’s a $100K swing in price. Even the CEO of Zillow says they aren’t meant to be used as fact (see below for the article).  Instead, he says it’s a starting point for a pricing discussion. If it’s not even close to accurate, why are you taking these estimates as gospel? Wouldn’t it be called a “Zaccurate” if it was accurate?

So why they aren’t accurate and what are these Zestimates based on?

  • In Whatcom County, most of their data comes from public data derived from the county, city and state. The problem with this data is that it is out of date to begin with. Anyone who has lived in Whatcom County for any length of time knows that the data is often inaccurate and this, in part, is what Zestimates are based on.
  • The portals do not have access to sold home prices – en masse – which adds another layer of inaccuracy to the mess.
  • The portals then apply an algorithm – a computer program – to these disparate incorrect pieces of data to derive an estimate of value.

How can an accurate price be determined for a home when the data it is based on is out of date and incorrect? It can’t.

So how should the value of a home be determined if you want it to be accurate?

  • Sold home data – hard dollars spent – in a recent time period on homes that compare to each other is the most important way to determine the current market value of your home. Appraisers only use comps that have sold within the last three months which have a similar number of bedrooms, baths, square footage and features and are located within a 1 mile radius of the subject property. This is the reason why that the beautiful new construction 3 bedroom single family home that sold a year ago on your street doesn’t help the value of your 100 year old 2 bedroom four-flat condo. Only real estate professionals and appraisers have access to this sold data; portals do not.
  • The condition of your home is a factor. All things being equal, an updated home will be of more value than an identical home in bedroom, bath and square footage count no matter how much you love your “charming!” 50 year old kitchen and asbestos filled basement.
  • Whether a neighborhood is appreciating or depreciating in value will affect the price of your home.
  • Often a seller’s perceived value of their home and the actual market price are very different numbers. You might be willing to overlook that your home has no AC and that the third bedroom is the size of a storage closet because you think the home has a ton of character which makes it worth the same as a home with Central AC and three large bedrooms, but these issues affect the price whether a seller wants to admit it or not. This is why determining the fair market value of a home is a mixture of art and NWMLS data. Our jobs as a REALTORS® is to help you determine where the actual market price of your home is based on the accurate information we have at my disposal, not the perceived price based on your emotions.

So, in lieu of talking to us or any other REALTORS ® , where can you go for accurate information?

  • We will send you a link, to my system that is accurate, and two apps HomeSpotter & HomeSnap which are integrated with it. See a house on Zillow, Trulia, etc. that you like? Look it up on my App or NWMLS to be sure it’s actually available. Our sites are updated constantly. Zillow’s website sometimes has information on it which is 6 months old. In a fast moving market, this could make or break your buying experience – specifically how much time you waste online.  
  • You’ll need to find every home in your general area (remember that 1 mile radius) and neighborhood which matches your home’s bedroom, bath, square footage, parking, etc. which has sold in the last three months since that is the time frame appraisers use. Then you need to go inside of them (or find recent photos of the interior) to make sure they match your home in terms of quality, condition and finishes to determine a somewhat accurate value. Or you can pay for an appraisal every year until you’re ready to sell. Or we can generate an MLS report of sold homes in your neighborhood for you whenever you’d like, which is free. One tip we do recommend for sellers is to claim your home on Zillow so you can make the data as accurate as possible.  See a blog post below on how to claim your home.

The bottom line for these and other websites is this: They are nothing but advertising sites meant to monetize your eyeballs. Next time you log-on to a portal such as Zillow and Trulia, look for an ad for a bank, or three-plus agents (who pay to make it look like it is their listing which it isn’t), or a mortgage person or any of the myriad of advertising partners these companies have. Every time you look up a home as a buyer, or try to ascertain value of a home as a seller you’re selling an ad for these people and companies to the tune of multiple millions of dollars every year. They aren’t in the business of accuracy, only your eyes on an ad. Want accuracy? Want to know the market value of your home? Tired of wasting your time online? Give us a shout.

Questions? Contact us at andi@andidyer(dot)com or 360-734-6479.

This content is not the product of the National Association of REALTORS®, and may not reflect NAR’s viewpoint or position on these topics and NAR does not verify the accuracy of the content.

By Andi Dyer August 26, 2025
LAST CHANCE: First-Time Homebuyer Class — Two-Night Series (Sept & October) Missed Tuesday’s class at Goods? You’ve got two more chances this year—each is a two-night event. Pick one month and plan to attend both nights to complete the series at Movement Mortgage: 2200 Rimland Dr, Suite #250, Bellingham, WA 98226. Choose your series: * September: Sept 15 and Sept 17 at 6:30 pm * October: Oct 20 and Oct 21 at 6:30 pm Why join us: Unlock up to $40,000 in down payment assistance through the Washington State Housing Finance Commission (eligibility applies; this class is required to qualify). Whatcom County market snapshot: what’s moving, what’s sitting, and why. Clear, step-by-step game plan: financing → offers → inspections → keys. Live Q&A with local pros. Bring your questions (we’ll translate the acronyms). Space is limited—these are our final classes of the year. P.S. Assistance programs have eligibility requirements and limited funds. We’ll walk you through the details so you know exactly where you stand.
By Andi Dyer August 26, 2025
LAST CHANCE: First-Time Homebuyer Class — Two-Night Series (Sept & October) Missed Tuesday’s class at Goods? You’ve got two more chances this year—each is a two-night event. Pick one month and plan to attend both nights to complete the series at Movement Mortgage: 2200 Rimland Dr, Suite #250, Bellingham, WA 98226. Choose your series: * September: Sept 15 and Sept 17 at 6:30 pm * October: Oct 20 and Oct 21 at 6:30 pm Why join us: Unlock up to $40,000 in down payment assistance through the Washington State Housing Finance Commission (eligibility applies; this class is required to qualify). Whatcom County market snapshot: what’s moving, what’s sitting, and why. Clear, step-by-step game plan: financing → offers → inspections → keys. Live Q&A with local pros. Bring your questions (we’ll translate the acronyms). Space is limited—these are our final classes of the year. P.S. Assistance programs have eligibility requirements and limited funds. We’ll walk you through the details so you know exactly where you stand.
By Andi Dyer August 25, 2025
If you know Bellingham, you know 1107 Railroad Ave. This is the building that grew up with Boundary Bay Brewery from its early days in the basement to the bustling beer garden and stage that became a heartbeat of downtown. Now, this iconic property is officially back on the market . 3 connected buildings (1103–1107 Railroad Ave) Prime .55 acre lot across from Depot Market Square 10,599 sq. ft. of historic commercial space Zoned Commercial with endless potential Whether you see the future as a brewery, event space, or another community-minded hub, opportunities like this don’t come around often. Reach out today to explore this rare piece of Bellingham’s history and future. Andi Dyer Real Estate Real estate with care, respect, and vision Andi: 360.734.6479 | Katie: 360.820.3065 
By Andi Dyer August 25, 2025
Tuesday evenings now through Aug 26th from 6–8 PM , depart from the Bellingham Cruise & Ferry Terminal for a bay tour with local legend Kolby LaBree plus select trivia and family nights. Tickets $55 (or $45 for Museum members); kids 5 and under sail free . Proceeds support Whatcom Museum programs. Grab your spot before they sell out. P.S. I did the history tour with Kolby a few weeks ago and it was terrific, I learn something new each time with her!
By Andi Dyer August 13, 2025
Join us and our guest Amy Baker to learn about first-time home buying on Tuesday, August 19th, at Goods Local Brews (2620 Northwest Ave.) at 6 pm. Buying your first home is an exciting milestone, and we’re here to help make the process simple and stress-free! Join us for our First-Time Home Buyer Seminar, where we’ll break down everything you need to know—from understanding mortgages and down payment assistance programs to navigating the home-buying process with confidence. Whether you’re just starting to explore your options or ready to take the next step, this seminar will provide expert insights and practical advice to help you make informed decisions on your journey to homeownership. Questions? Call/text: 360.734.6479 
By Andi Dyer August 13, 2025
The body content of your post goes here. To edit this text, click on it and delete this default text and start typing your own or paste your own from a different source.
By Andi Dyer August 13, 2025
WANT A FREE MACDUFF 2.0 STICKER? MACDUFF 2.0 stickers are here! Want one? Text or call me at 360.734.6479 and I’ll hook you up with a free sticker! 
By Andi Dyer August 13, 2025
I’m thrilled to share that I’ll be representing the Women’s Council of REALTORS® – Northwest Washington Network at this year’s WCR NXT Convention in Houston ! I'm going as the Vice President of Whatcom, Skagit, & Island County. It’s a powerful gathering of real estate leaders from across the country, and I can’t wait to bring back fresh ideas, connections, and inspiration to our local network. Stay tuned for takeaways and behind-the-scenes peeks—this is going to be good. The Women's Council of REALTORS® advances women as professionals and leaders in business, the industry, and the communities we serve, and "When Women Are Present, Everything Changes."
By Andi Dyer August 4, 2025
So many possibilities with this 9.9-acre property in a prime location near I-5. The bright and airy rambler features an open floor plan and two primary suites, offering comfort and flexibility. Unique zoning allows for an RV park, and the property currently generates $50,000+ in part-time annual revenue through RV parking, camping, and a 2024 trailer that conveys with the sale and operates as a successful Airbnb rental. The land is beautifully landscaped with gardens, fruit trees, and lush, park-like scenery—creating a private sanctuary that feels far away yet remains close to amenities. Continue to grow the business, expand operations, or simply enjoy the peaceful setting while generating passive income. A rare opportunity!
By Andi Dyer August 4, 2025
JOIN THE PACK THIS AUGUST Lace up those sneakers and leash up your sense of adventure— the very first Race for the Underdogs 5K is happening at stunning Lake Padden in Bellingham on Sunday, August 17 at 8:30 AM . This heartwarming event benefits the incredible work of Happy Tails Happy Homes (HTHH) , a Whatcom County nonprofit that gives second chances to the animals who need it most. 🐶 Who You're Racing For HTHH isn’t your typical rescue. We’re a volunteer-powered, foster-based organization with no shelter, no offices, and no paid staff —just a deep love for the underdogs. That means every dollar raised goes straight to the animals, many of whom arrive with medical or behavioral challenges. We believe every tail deserves a happy ending. 🏃‍♀️ About the Race This scenic 5K trail loop winds counterclockwise around Lake Padden on soft grass and wooded paths. Starting near the picnic shelter at the east entrance, the route is mostly flat with a few rolling hills and one short uphill stretch through the trees on the lake’s southwest side. It’s peaceful, pet-friendly, and just the right mix of nature and challenge. 📍 Getting There From I-5 Northbound (Seattle): Take Exit 246 (N. Lake Samish), head left at the stop sign, drive 2.5 miles to the East Lake Padden entrance, and follow the HTHH signs to the playground. From I-5 Southbound (Bellingham): Take Exit 252 (Samish Way), go left over the freeway, right onto Samish Way, and continue 2.5 miles to the second Lake Padden sign (East entrance). Turn right and follow signs to the playground area.
More Posts