Before you negotiate anything, get a real termite inspection so you know exactly what you are dealing with. Either ask the seller to provide a termite inspection as part of their disclosures, which is fairly standard, or order your own during your due-diligence period. Never negotiate blind. On the worst case: tenting a single-family home typically runs in the low thousands, often around $2,000 regardless of the home's size. The woodwork repair is where the money can get away from you, ranging from a manageable few thousand up to much more depending on the severity of the damage. And frankly, it irks us when a flipper skips basic termite work, because it is a cheap, easy item to handle during a flip. The bigger caution on a flip: termite inspectors do not open up walls, so they cannot see behind drywall. Having flipped more than 40 homes ourselves, we can tell you hidden problems, water damage as much as termites, can sit behind a wall neither side knows about, especially if a past renovation covered up framing that should have been replaced. Since this seller is refusing to pay, negotiate hard on price to account for the unknowns, and lean on your inspection and the disclosures so you go in with eyes open.