Plotgleam Blog
AVM methodology, appraisal practice, and lending operations
Analysis from the Plotgleam team on automated valuations, comp science, and what Colorado lenders are seeing in the field.
Latest
Building Block-Up: Extracting Neighborhood Signals for More Accurate Property Valuations
Why zip-code-level price signals produce noisy estimates and how block-level aggregation reduces micro-market variance in automated valuation models.
Mortgage Velocity and the Appraisal Turnaround Constraint
Lenders track lock-expiry windows and fall-through rates closely. Appraisal turnaround time remains the hardest variable to optimize.
How to Test an AVM's Accuracy: The Case for Retrospective Validation Studies
What retrospective closed-loan testing reveals about AVM performance that prospective holdout sets miss.
The Defensibility Gap in Automated Valuations
When a borrower challenges a low AVM estimate, what can the lender actually document? Most AVMs produce a number without a rationale.
Why Your AVM Gets Block-Level Accuracy Wrong (And What the Fix Looks Like)
Mass-market AVMs average price signals across zip codes. This works fine for dense urban markets and fails badly for transitional blocks.
Desk Reviews Under FIRREA: What Lenders and Appraisers Need to Know
A practical overview of when desk reviews satisfy FIRREA's independence requirements and where automated valuation support fits in a compliant workflow.
Condition Adjustment in Manual Appraisals and What Automation Can Learn From It
Certified appraisers adjust comp prices for condition differences. Here's the heuristic behind those adjustments and why automating it requires more than listing descriptions.
The Comp Selection Problem: Why Location Proximity Isn't Enough
Selecting comparable sales by distance alone ignores property type mix, condition variance, and micro-market clustering.
What Mortgage Lenders Actually Need from an AVM (It's Not Zillow Accuracy)
Consumer-facing home estimates and lender-grade valuations are solving completely different problems. Here's what matters for underwriting decisions.
The Two-Week Appraisal Window Is Costing Your Pipeline
Appraisal turnaround time averages 9-15 business days at peak origination volume. Here's what that delay actually costs in fallout rate and lock extension fees.
Appraisal Waivers and GSE Policy: What the Trend Means for Lenders Using AVMs
Fannie and Freddie have expanded appraisal waiver programs. Understanding where AVMs fit in the waiver eligibility picture.
AVM Confidence Intervals: What They Are and Why Lenders Should Demand Them
An AVM that reports only a point estimate is giving you half the information you need. Understanding confidence ranges and why they matter for risk-layering decisions.
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