Seller offered to make repairs himself

[Jay Garrison]

Hello,

After having a two flat here in Chicago inspected, I discovered that it would need a new roof. I asked the seller (a contractor) to come cover the closing costs, which would be about the cost of a new roof. His counter offer was to do the roof himself, and then I could reinspect it. That sounds okay to me, but I want him to pay for the reinspection, since I have already paid for the initial inspection. Does that sound like a good move for me to make? EDIT: I looked at the email the seller sent my lawyer, he says he will not provide receipts for labor or material. Is that a bit odd?