Almost every seller I meet has already looked up their own address before we talk. That is not a criticism, it is what anyone would do. The trouble starts when that automated number gets treated as a listing price instead of what it actually is, which is a rough estimate built from public data.
What the algorithm sees
An automated estimate pulls from public records and recent nearby sales: square footage, bedroom and bathroom counts, lot size, sale prices in the area. It runs that through a model and spits out a number. For a neighborhood of nearly identical houses built the same year, it can land close. For anything with more variation, the model is guessing with limited information.
What it cannot see
It has never walked through your kitchen. It does not know you replaced the roof two years ago, or that the primary bath still has the original fixtures from when the house was built. It cannot smell the finished basement or notice that the lot backs up to a busy road instead of a quiet one. Condition and specific location within a neighborhood move price more than most sellers expect, and neither shows up in an algorithm.
Why the number moves around
Check the same address on two different sites and you will often get two different numbers, sometimes tens of thousands of dollars apart. Both are built from similar public data run through different models. Neither one is wrong exactly, they are just estimates, and estimates disagree.
What an actual comparative market analysis adds
A real comparative market analysis starts with the same public sales data and then adds the parts an algorithm cannot: which comps actually resemble your house, what condition each one was in when it sold, what got negotiated after inspection, and how your specific street or section of the neighborhood is trading right now. I walk through exactly how I build that analysis in how I actually think about pricing a home in the Memphis area.
An automated estimate has never stood in your kitchen. A comparative market analysis has.
Use it as a starting conversation, not a listing price
The right way to use an automated number is as a rough anchor before you talk to someone who can actually see the house. Pricing a home wrong in either direction costs sellers real money, whether it sits too long at too high a number or leaves money on the table by starting too low. I have seen both play out in the details I walk through in what really happens when you sell without an agent.
The takeaway
An automated estimate is a fine place to start a conversation. It is a poor place to end one. Get a real comparative market analysis before you decide what your house is worth.