By Joseph T Ellington Jr – Licensed Residential Appraiser, Capital Valuations. Updated September 2026.
Why two square-footage figures can disagree
An MLS entry, tax assessment, builder plan, and appraisal can report different living-area figures. The difference might be a simple transposition, a dated record, a different definition, or a field-measurement error. Investigate the method and underlying dimensions before declaring one figure correct. This article is a troubleshooting checklist; our measurement workflow explains how to calculate area. If the discrepancy also involves room use, our Virginia bedroom classification guide explains why a room label alone does not settle its treatment.
Eight errors to investigate
| Potential error | How to check it |
|---|---|
| Wrong unit or transcription | Compare raw dimensions and calculated totals with the report |
| Incorrect laser reference | Confirm front/back reference point and repeat the run |
| Tape slack or angled measurement | Repeat level and straight between identified endpoints |
| Open or overlapping sketch polygons | Reconcile level outlines and subtract excluded areas |
| Different finished-area definition | Separate above-grade, below-grade, unfinished and accessory areas |
| Old permit or assessor record | Compare addition dates, plans and actual property |
| Sloped ceiling or limited-height space | Record heights and apply the relevant standard |
| Assumed site boundary | Use a survey for a boundary issue; a house sketch is not a survey |
Do not confuse the house outline with the parcel
A tax map, GIS boundary or measuring wheel may help understand a site, but it does not establish the legal boundary or the dwelling’s finished area. If a fence, easement, or lot line is disputed, consult a licensed surveyor and the recorded documents. The appraiser can identify information relevant to valuation within the assignment scope.
Reconcile the report
- List each source’s area figure, date and stated basis.
- Recalculate from the field sketch by level, retaining precision until final reporting.
- Check the applicable Fannie Mae area guidance and our ANSI explanation when the assignment uses that standard.
- Identify any inaccessible area or permitted exception and explain it.
- If the corrected area changes comparable analysis, reconsider the valuation rather than only changing a label.
A homeowner can supply a plan or permit but should not demand a particular figure. For a lender appraisal, route a factual correction through the lender’s review process. For a private assignment in Hampton Roads, contact Capital Valuations with the property address and underlying documents.
