Can a low appraisal be challenged?

Challenging a low appraisal usually means submitting a reconsideration of value to the lender, backed by comparable sales the original appraiser may have missed or undervalued. The lender decides whether to send the case back to the same appraiser or order a second opinion, and there is no guarantee the number changes. Brian Beatty builds that comparable-sales case directly rather than leaving a buyer or seller to argue with the lender alone.