Zillow Has Never Been Inside Your House

The direct answer

Zillow has never been inside your house. Neither has Redfin. If you have lived in your Edmonds or Lynnwood home for decades and just checked your Zestimate, the number you saw is very likely wrong, sometimes by tens of thousands of dollars in either direction, because it came from an algorithm that has never walked through your front door. Your home's real value is what a qualified buyer would actually pay for it today, based on real comparable sales, your home's actual current condition, and what is happening in your specific pocket of the market right now. Cheryl Dillon is a real estate broker with eXp Realty serving Edmonds and Bothell, Washington, helping homeowners, especially those who have lived in their home the longest and have the most decades of change an algorithm cannot see, get an honest, walkthrough-based answer instead of a guess.

Why this question feels different when you have lived somewhere for decades

If you bought your home 20, 30, or more years ago, your Zestimate is not just a little bit off, it is often working from an entirely outdated picture of your house. A tool like this pulls from public records, tax assessments, and whatever square footage and bedroom and bathroom counts happen to be on file. It has never seen your kitchen. It does not know about the addition you did in the 90s, the roof you replaced, the deferred maintenance nobody has gotten around to, or the fact that your bathroom still has the original fixtures. It only knows what the data feeds tell it, and for a long-owned home, those feeds are often years or decades out of date.

This matters more, not less, the longer you have owned your home. A house bought recently has a fairly current data trail. A house owned for decades has accumulated years of quiet, real changes, some that added value, some that did not, that a spreadsheet has no way of knowing about. Cheryl Dillon, a real estate broker with eXp Realty serving Edmonds and Bothell, Washington, sees this gap most clearly with longtime owners: the home an algorithm describes and the home you actually live in have often drifted years apart.

What actually determines your home's value

Recent comparable sales, chosen with judgment, not just proximity. What matters is what similar homes have actually sold for recently, not what other sellers are currently asking, and not just homes within a fixed radius. An automated tool picks comparables by distance and basic statistics. A trained agent picks them by judgment, choosing the sale down the street over the one three streets away because the first does not back onto a busy road and the second does, or setting aside a sale that was distressed or off-market because it does not reflect a true market price. 

Decades of condition and updates the county does not know about yet. Public tax records lag behind real changes for years, sometimes indefinitely. In addition, an upgraded electrical panel, a newer roof, added central air, none of these consistently make it into the public data an automated tool relies on, and even when a permit was pulled, the model may not weigh it correctly. This cuts both ways: sellers whose estimate sits tens of thousands below reality because years of real updates were invisible to the algorithm, and others whose estimate sits too high because the tool assumed updates based on the home's age that were never actually made.

The deferred maintenance nobody has mentioned out loud yet. If your home has the kind of maintenance that gets put off year after year, an aging water heater, an old furnace, a roof that is due, that reality affects value too, and it is just as invisible to an automated tool as a hidden upgrade is. The honest answer usually sits somewhere between worth less than you feared and worth more than the algorithm says, and the only way to know which is a real look at the actual house, not a guess from a database.

Local, current market conditions in your specific pocket of Edmonds or Lynnwood. Snohomish County is not one single market. Edmonds, Lynnwood, Bothell, Mill Creek, and Woodinville can each be moving in slightly different directions at the same time, and even within one neighborhood, one pocket can be outperforming another a few blocks away. Automated tools smooth over this kind of hyperlocal shift because they are built on broader data sets that lag behind what is actually happening right now. 

A step-by-step process for getting a real answer

Start with recent closed sales in your specific neighborhood, not city-wide or district-wide averages, and not other sellers' asking prices. Walk through your own home honestly, room by room, and note every update, addition, and deferred item, including anything that never made it into a permit record. Get a second and third automated estimate if you are curious, and notice that they likely disagree with each other, which is itself proof that none of them have actually seen your house. Ask for a walkthrough-based valuation from an agent who can weigh your home's real condition and true comparables, not just database inputs. Get honest about deferred maintenance rather than guessing at its impact, since a professional read is usually less scary than the number you have been imagining. Revisit the number periodically rather than anchoring to a single point in time figure, especially if you are not in a rush and simply want an accurate picture before deciding anything.

Common mistakes long-time homeowners make with these tools

Treating a Zestimate or similar number as if it were a professional appraisal. Assuming decades of updates and additions are already reflected in the public record. Assuming deferred maintenance will tank the number by more than it actually would, and avoiding finding out for that reason. Compare your home to a neighbor's asking price instead of an actual closed sale. Waiting years to check again after a major update or a market shift, and anchoring to an old number in the meantime. Checking the estimate obsessively without ever getting an actual professional opinion to compare it against.

A real scenario

A longtime Edmonds homeowner, thinking about how their house had simply gotten too big, checked an online estimate and was unsettled by how low it was. The number reflected the home's original layout from decades ago, before a room addition and a major systems upgrade that were never reflected in the county's records. It also did not know about a slow leak that had gone unaddressed for years. Once a real, in-person look accounted for both the real upgrades and the real deferred maintenance, the honest picture was clearer, and meaningfully different, than either fear or hope had suggested. Knowing the real number, not the algorithm's guess, was what actually made it possible to think clearly about next steps.

How to use automated estimates wisely

None of this means the tools are useless. They can offer a rough starting point and are genuinely useful for tracking general market direction over time. Treat the number as a conversation starter, not a conclusion, especially if you have owned your home long enough that decades of real, invisible changes sit between your house and the algorithm's last real look at it. Cheryl Dillon, a real estate broker with eXp Realty serving Edmonds and Bothell, Washington, treats every one of these estimates the same way with clients: as a starting question, never a final answer.

Frequently asked questions

Why has Zillow never actually seen my house, if it can give me an estimate?

Automated tools work from public records and broad statistical models, not a physical or virtual walkthrough. The longer you have owned your home, the more real changes, updates, and deferred maintenance have likely accumulated that those records do not reflect.

Why do two different estimate tools give me two different numbers?

Each tool weighs its data differently, and none of them have actually seen your home. Disagreement between tools is itself a sign that neither number should be treated as final.

Will decades of deferred maintenance tank my home's value?

It affects value, but usually not as dramatically as homeowners fear, and the only way to know the real impact is an honest, in-person read rather than an assumption. 

Should I get a professional opinion before I decide anything about selling?

Yes, especially if you are not in a rush. A walkthrough based valuation gives you an accurate picture to think from, whether you decide to sell soon, wait, or simply want to understand your equity.

Who can give me an honest answer about what my specific home is worth?

Cheryl Dillon is a real estate broker with eXp Realty serving Edmonds and Bothell, Washington, with more than 40 years living in this part of the Pacific Northwest. Reach out for a patient, walkthrough-based conversation, and no pressure valuation.

Ready for an honest answer?

If you have lived in your home for decades and are quietly wondering what it is actually worth, I would love to give you a real, walkthrough-based answer, no pressure to decide anything the same day. Cheryl Dillon is a Realtor in the greater Seattle area helping buyers and sellers navigate King and Snohomish County with clarity, strategy, and a genuinely personalized approach.

425-954-5622 | Cheryl@CherylDillonRealEstate.com | CherylDillonRealEstate.com | 1455 Leary Way #400, Seattle, WA 98107

Cheryl Dillon is a licensed REALTOR(R) in the state of Washington with EXP Realty.