AVMs, online estimates, and when they are not enough

An automated valuation model is a statistical estimate produced from public records and past sales without anyone looking at the property. AVMs are fast, cheap, and genuinely useful for what they are built to do. They are also wrong in specific, predictable ways.

What an AVM does well

In a subdivision of similar houses that trade often, with clean public data, an AVM can land close. Portfolio monitoring, early screening, and rough tracking of your own equity are all reasonable uses.

Where it breaks down

• Condition. No model knows the roof is failing or the kitchen was redone last year.
• Thin data. Rural property, land, and unusual buildings have few comparable sales, and models need volume.
• Bad public records. Wrong square footage or an unrecorded addition goes straight into the answer.
• Anything unique. Special-purpose buildings, partial interests, easements, access problems, and takings are all outside what a model can see.
• Retrospective dates. Estates and litigation need a value on a past date, with the reasoning shown.

The part that matters most

An AVM gives you a number with no reasoning attached. When somebody has to be persuaded, a lender, a court, a county board, or the IRS, the reasoning is the whole product. A number nobody can interrogate is not evidence.

When you need the real thing

Estate settlement, tax appeal, divorce, litigation, eminent domain, partial interests, PMI removal, and any lending decision of consequence. Call 984-360-8050 or email claude@globalappraisal.net.