Type your address into any real-estate site and you'll get an instant "value" in seconds. It's a fine starting point — and a terrible place to stop. That number is a computer's guess, not a price, and treating it as gospel can cost you real money whether you're selling, refinancing, or just curious. Here's what actually determines what your home is worth.
Automated estimates are a guess, not an appraisal
Online home-value tools (often called AVMs, or automated valuation models) run public records and past sales through an algorithm. They're useful for a rough range, but they're blind to the things that most affect price. A model can't see that you renovated the kitchen, replaced the roof, or that a busy road runs behind the backyard. That's why two identical-looking homes can carry the same online estimate and sell tens of thousands of dollars apart. Read the number as a wide range, never as a listing price.
Comps are what actually set the price
Real value comes from comparable sales — "comps." These are similar homes near you that actually sold in the last few months, adjusted for differences in size, condition, and features. Not list prices, not what a neighbor hopes to get — closed sales. A local agent pulls real comps and reads the nuances a model can't: which street is quieter, which school boundary buyers pay up for, how fast homes like yours are moving right now. That local read is the difference between a number and a price.
The things that move your number
- Location and lot — the same house is worth more on a quiet street than a busy one, and corner lots, views, and yard size all count.
- Condition and updates — kitchens, baths, roof, and mechanical systems move the needle most; cosmetic freshness helps too.
- Size and layout — square footage, bedroom and bath count, and a functional floor plan.
- Market timing — inventory, buyer demand, and mortgage rates shift prices month to month.
- Pricing strategy — the first two weeks on market draw the most attention, so pricing right from day one often nets more than starting high and cutting later.
Estimate, appraisal, and market value aren't the same
Three different numbers get confused constantly. An online estimate is an algorithm's rough guess. An appraisal is a licensed professional's opinion of value, usually ordered by a lender to protect the loan. Market value is what a real buyer will actually pay today — the only number that matters when you sell, and the one a skilled listing agent is built to find. They can land far apart, which is exactly why the instant estimate is only a starting point.
Selling? Remember the after-tax picture
What your home is worth and what you keep are different questions. Selling costs and, for some sellers, capital-gains tax affect your walk-away number — though many primary-home sellers qualify for a large capital-gains exclusion. This is educational only, not tax advice; the IRS explains the home-sale rules in Topic No. 701, and a tax professional can confirm your situation.
Want a real number? Get a real number from a local agent who'll price your home from actual comps — free, with no obligation and no pressure to list. On Homegrity, sellers are always free, we never take a cut of your sale, and your details are never resold. Get matched with a local agent → To prepare, read the complete home sellers guide and our seller guide, and if commission is on your mind, see how to save on real-estate commission.
Frequently asked questions
Are online home value estimates accurate?
They're a reasonable starting range but not a price. Automated models can't see your home's condition, updates, or exact location quirks, so real values often differ meaningfully from the instant estimate.
What's the difference between an appraisal and a home value estimate?
An online estimate is an algorithm's guess. An appraisal is a licensed professional's formal opinion of value, usually ordered by a lender. Market value — what a buyer will actually pay — can differ from both.
How do agents determine what my home is worth?
They pull comparable sales — similar homes nearby that recently sold — and adjust for size, condition, features, and current market conditions. It's the same foundation an appraiser uses, informed by local knowledge.
Do I have to pay to find out what my home is worth?
No. A local agent will give you a comparative market analysis for free, with no obligation to list. On Homegrity, getting matched with that agent is always free and your information is never resold.

