Yes, it is. If you got a 1099-S for the sale of $300k, you can include $30k for repairs as a selling expense along with other sales expenses listing on the closing statement (realtor commissions). (See the attached screenshot below. Click to enlarge.)
Make sure the you report the sales price as it's listed on the 1099-S.
Please feel free to post any additional details or questions in the comment section.
