A hot housing market directly drives up property tax assessments as county appraisal districts use recent sales data to set property values. When home prices surge 20-30% annually, assessments typically follow within 1-2 years, though Texas homestead exemptions provide significant protection for primary residences.
The Direct Connection: Sales Drive Assessments County appraisal districts determine property values primarily through the sales comparison approach. When your neighbor's similar home sells for $450,000 — up from $350,000 two years ago — that 29% increase becomes evidence for raising your assessment.
Here's how the timeline typically works: Year 1: Hot market drives up sale prices Year 2: Assessments begin reflecting these higher sales Year 3: Full impact shows in property tax bills Harris County, for example, saw median home prices rise 18% in 2025.