Appraisal Fundamentals
Extraordinary Assumptions & Hypothetical Conditions
Two specific, disclosed tools for handling uncertainty — not loopholes, and not the same thing.
Sometimes an appraiser has to move forward without complete certainty about a fact, or has to analyze a property under a specific defined scenario. USPAP gives two distinct, clearly-disclosed tools for exactly these situations.
Two Distinct Tools
Extraordinary Assumption
Something the appraiser assumes to be true for the assignment, even though it hasn't been fully verified, when that assumption is reasonable and disclosure would let a user understand its effect — for example, assuming an unverified renovation permit was properly finalized.
Hypothetical Condition
Something the appraiser knowingly treats as true for analysis purposes even though it's contrary to known fact as of the effective date — for example, valuing a property 'as if repairs were already complete' when they aren't yet.
Why Disclosure Is the Whole Point
The core requirement behind both tools is transparency: the report has to clearly state that the assumption or condition was used, and explain how relying on it might affect the analysis if it turns out not to hold. That disclosure is what allows the intended users to correctly interpret the opinion of value.
What This Does Not Mean
These tools don't let an appraiser skip real research when verification is reasonably available, and they aren't a way to value a property as something it fundamentally isn't. They're narrow, disclosed mechanisms for handling specific, defined uncertainty — not a general escape hatch from standard practice.
Frequently Asked Questions
Provided for general educational purposes based on USPAP definitions of extraordinary assumptions and hypothetical conditions. Last reviewed: August 2026.