By Joseph T Ellington Jr – Licensed Residential Appraiser, Capital Valuations. Updated September 2026.
Extraordinary assumptions in a real estate appraisal
An extraordinary assumption concerns an assignment-specific uncertain fact that the appraiser assumes is true for the analysis. If the assumed fact turns out false, it could affect the conclusions. It is not a license to invent a favorable property condition. The report should make the assumption and its possible effect clear. See the Appraisal Institute guide notes and applicable USPAP for the exact requirements.
A practical distinction
| Concept | What it means | Illustrative situation |
|---|---|---|
| Extraordinary assumption | A relevant fact is uncertain and assumed true with a reasonable basis | Limited access prevents confirming a stated feature, subject to a credible scope |
| Hypothetical condition | Something known to be contrary to fact is assumed for analysis | Value as if a planned renovation were completed when it is not |
These examples illustrate definitions, not a claim that either condition is appropriate for every assignment. An appraiser must decide whether the scope, premise, and disclosures allow credible results. A lack of time does not automatically justify assuming away a material defect.
Questions a client can ask
- What specific fact is unknown?
- Why is there a reasonable basis for the assumption?
- What evidence would resolve the uncertainty?
- Could a different fact materially change value?
- Is the intended use compatible with the resulting report limitation?
For a retrospective estate assignment, past condition may need evidence from dated photographs, permits or prior listings. A client should not expect an extraordinary assumption to replace available research. Read our date-specific estate guide. For a planned repair or as-repaired scenario, ask whether a hypothetical condition is needed; see our as-is sale discussion. For planned construction, see how a completed-condition premise should be defined before the assignment.
To discuss an appraisal with an unusual property fact in Hampton Roads, contact Capital Valuations with the property, intended use and available records.
