USPAP does not specifically address this scenario. in my opinion the extend to which the scope of work has changed is significant therefore is a new assignment.
what does USPAP say about scope of work?
SCOPE OF WORK RULE
For each appraisal and appraisal review assignment, an appraiser must:
1. identify the problem to be solved;
2. determine and perform the scope of work necessary to develop credible assignment results; and
3. disclose the scope of work in the report.
Comment
Scope of work includes, but is not limited to:
• the extent to which the property is identified;
• the extent to which tangible property is inspected;
• the type and extent of data researched; and
• the type and extent of analyses applied to arrive at opinions or conclusions.
• the extent to which the property is identified
has changed
• the extent to which tangible property is inspected
has changed
• the type and extent of data researched
has changed
• the type and extent of analyses applied to arrive at opinions or conclusions
has changed
159. CHANGING THE SCOPE OF WORK AFTER THE REPORT HAS BEEN SUBMITTED
Question: Sometimes after submitting my appraisal report, my client will ask me to perform
additional work. This can mean looking at more or different comparables or
developing another approach. Do these requests for additional work create a new
assignment?
Response: No. Requests to perform additional research or analysis change the scope of work, but do not
create a new assignment. The additional work can be performed as part of the original assignment.
The appraiser may decide, as a business decision, to treat the request for additional research and
analysis as a new assignment, but it is not required.
edit//
also my notes from an FHA webinar include the following:
-What happens if the contract changes after the appraisal?
--the appraiser appraises the property based on the conditions at the time it was ordered
--base the scope of work at the time of appraisal
--
anything which changes the conditions under which the appraisal was written needs an appraisal update and may constitute a fee increase.
dont just change the report
--change in FHA case number? should be corrected
--amount of concessions change? requires an update
--tree falls on house after appraisal is completed? requires an update