Not easily. Appraisers are not very willing to "adjust" their appraisal as it would indicate they did not do a good job to begin with. They also do not want you to talk to them "directly". You will have to find issues like: not the right comparable, not the same finishes (appraisers rarely know anything about the inside of another property), not the right size, too far from the subject property, lot size issues, etc etc. If you are not familiar with reading appraisals, they are somewhat puzzling. Ask your mortgage broker, to see if you can get a second appraiser in (at a cost of course), and in time withing the offer criteria. The appraiser may not be familiar with the area ( happens more often than you think). I do not wish this on anyone. Good luck.