If there's significant damage, you may have a problem.
What's the bidding process? Is this an auction or at the courthouse steps??
With Conventional mortgages you should not have a huge issue with this. The appraisals tend not to be as structure-oriented as FHA/VA appraisals. This may effect value, but not your ability to obtain the loan. As long as home is not a risk for occupancy, you should be fine.
Best of luck,