Four ways to estimate your home's value
Not all valuations are created equal. Here is what each one actually does, where its data comes from, and how much weight you should give it.
1. Automated Valuation Models (Zestimates, Redfin Estimates)
Sites like Zillow and Redfin run algorithms on public tax records and recent sales to generate an instant value. It is free and it is fast. It is also frequently wrong.
Zillow's own published data shows a national median error rate of roughly 2.4% for on-market homes, but that number jumps to 7.5% or higher for off-market homes. On a $500,000 house, 7.5% is a $37,500 swing in either direction.
The reason is straightforward: these models use public data only. They do not know that you renovated the kitchen last year. They do not know the roof leaks. They cannot see that your street has a noise problem or that the school down the block just improved its rating. They are working with the tax assessor's square footage and the last sale date, and extrapolating from there.
2. Comparative Market Analysis (CMA)
A CMA is prepared by a real estate agent. The agent pulls recent closed sales of comparable homes (comps) from the MLS, adjusts for differences in size, condition, and features, and arrives at a suggested list price.
A good CMA is significantly more accurate than a Zestimate because the agent can account for condition, upgrades, and local market dynamics that algorithms miss. The catch is that CMAs are only as good as the agent preparing them. An agent who wants your listing may inflate the number to win you over. An agent unfamiliar with your neighborhood may miss critical nuances.
CMAs are also typically free, which means the agent's incentive is not accuracy. It is getting hired.
3. Professional Appraisal
An appraisal is conducted by a licensed, independent appraiser who physically inspects the property and prepares a formal report. Lenders require appraisals before issuing a mortgage, so most homes get appraised during the sale process anyway.
Appraisals cost $300 to $600 and take one to two weeks. They are the gold standard for accuracy because the appraiser has no financial stake in the outcome and follows standardized methodology (USPAP guidelines). The downside is cost and timing. You usually do not order one until you already have a buyer under contract.
For sellers, ordering a pre-listing appraisal can be useful but expensive, and the value can shift by the time you actually close.
4. HomeIQ Report
HomeIQ is Meydomo's valuation product. It sits between the free-but-unreliable Zestimate and the accurate-but-expensive appraisal. For $4.95, HomeIQ pulls data from multiple sources that automated tools typically miss:
- County assessor records: lot size, year built, permitted improvements, tax-assessed value
- MLS closed sales: actual transaction prices of comparable homes, not just list prices
- Neighborhood trends: median days on market, list-to-sale ratio, price trajectory over the last 6 to 12 months
- Absorption rates: how fast homes are selling in your area, which tells you whether you are in a buyer's or seller's market
The result is a report you can read in ten minutes that gives you a defensible price range, not a single number with hidden uncertainty.
Why most online estimates are wrong
Online valuation tools fail for three structural reasons that no amount of machine learning can fully solve:
They cannot see condition
Two houses with identical square footage, year built, and lot size can differ by $100,000 or more based on condition. One has a remodeled kitchen and new windows. The other has original 1985 everything. An algorithm looking at tax records sees them as the same house.
They miss local nuance
A house backing up to a highway sells for less than an identical house on a quiet cul-de-sac. A home in the catchment zone of a top-rated school commands a premium. A property with a flood zone designation carries risk that suppresses value. These factors exist in the real world but not always in the data that feeds automated models.
They lag the market
Automated models rely on closed sales data, which is typically 30 to 90 days old by the time it enters the system. In a market that is moving quickly in either direction, the estimate can be meaningfully stale. A neighborhood where three homes just sold above asking may not reflect that momentum for months in an automated tool.
Going deeper with the AI prep analysis
The standard HomeIQ report tells you what your home is worth today. The AI prep analysis (GamePlan) — included with QuickSell and Full Service Sell — tells you what it could be worth with targeted improvements.
You upload photos of your rooms. AI vision analyzes each one and identifies specific opportunities: a bathroom that would benefit from updated fixtures, a kitchen where new countertops would move the needle, a living room where paint and lighting changes would shift buyer perception. For each recommendation, your AI prep analysis calculates the estimated cost using local trade rates and the expected return on investment.
The point is not to convince you to renovate your entire house. It is to show you which improvements are worth the money and which are not. Spending $3,000 on a kitchen refresh that adds $12,000 to your sale price is a good trade. Spending $15,000 on a bathroom remodel that adds $8,000 is not.
Quick comparison
| Method | Cost | Speed | Accuracy |
|---|---|---|---|
| Zestimate / AVM | Free | Instant | Low to moderate |
| Agent CMA | Free | 1-3 days | Moderate (varies by agent) |
| Appraisal | $300-$600 | 1-2 weeks | High |
| HomeIQ | $4.95 | Minutes | Moderate to high |
What to do once you have your number
A valuation is the starting point, not the finish line. Once you know what your home is worth, you can make informed decisions about everything that follows: whether to make improvements before listing, how to price competitively, and which selling path makes the most sense for your timeline and goals.
The next guide in this series, The Real Cost of Selling a Home, breaks down every expense you will encounter so you can calculate your actual net proceeds, not just the sale price.
Get your HomeIQ report for $4.95
County assessor data, MLS closed sales, neighborhood trends, and absorption rates. Delivered in minutes, not weeks.
Get your HomeIQ reportWritten by Meydomo Editorial · Licensed broker reviewed