Automated Valuation Models (AVMs) and free online estimators are quick and tempting when you want a ballpark figure. But they rely on databases and algorithms rather than a professional appraiser’s on-site inspection and local market knowledge. AVMs are prone to missing renovations, deferred maintenance, non-conforming uses, zoning issues and sudden changes in market conditions. That makes them fine for casual curiosity, but not for matters that require accuracy and defensibi