Do not pressure the value
Explain why the appraisal is needed without saying it must reach the sale price or another preferred number. The appraiser develops the value from the property and the evidence.
You can offer factual information about a sale or comparable property for consideration. Do not insist that a particular sale be used or excluded to achieve a result.

Do not hide condition or control the analysis
Do not ask the appraiser to avoid photographing damage, ignore an addition or leave out a relevant fact. Give truthful answers and supply records that explain repairs, improvements and known issues.
What to provide instead
Offer a concise improvement list, dates, permits or plans where available, and relevant property records. Arrange access and remain available for questions.
If you find a factual error in a report, ask how to submit a documented question through the appropriate channel. A request for review should identify the information at issue rather than demand a preferred number.
If someone else ordered the report
You can share factual property information even when someone else arranged the appraisal. Who receives the report and who may rely on it are separate questions. Confirm those arrangements at the start; owning the home or paying a fee does not automatically give access to every report another party orders.
