Be careful, if you already know about these repairs you don't want to lock yourself out of other issues which may come up in the inspection. In a situation like this I would discuss the issues you already know about with some contractors and make an educated guess. Your offer should still contain an inspection contingency which I wouldn't do until the offer is accepted by both the seller and the bank. Because the seller in a short sale usually doesn't have the resources to do any repair work, your inspection will be to determine if you want to buy the house or walk away. You may be able to get the bank to make an adjustment after approval, but this is uncommon and only likely if you are truly prepared to walk away.
Some last thoughts, if you are prepared to buy a short sale with significant issues you need to make certain the repairs won't hold up financing or you need to get a rehab loan to account for them. Discuss the issues with your lender before you get too far along. Also realize that the short sale process is 90 to 120 days or more with no certainty it will be approved. Have your agent research the listing agentâ€™s track record of closing short sale listings. Some are very good and close most, others don't.