The range is too wide to guess: we've seen foundation fixes run $7,000 and we've seen them run $40,000. One hillside property had poor soil compaction that dropped the back of the house about four inches, and the fix ran roughly $40,000. We've also seen foundation issues resolved for $7,000 to $10,000. Same category of problem, wildly different bills, depending on the cause, the soil, and how much of the structure is affected. Because the range is that wide, write your offer contingent on a foundation inspection rather than relying on the seller's disclosures alone. A structural engineer or foundation specialist gives you an actual repair bid instead of a rumor, and that bid becomes your negotiating anchor. A practical way to run it: make the offer contingent on the inspection, tell the seller up front the repair budget range you're expecting, and be prepared to renegotiate if the real bid comes in higher. Homes that sit on the market with known foundation issues often come with motivated sellers, so a credible inspection number gives you room to move on price or ask for a credit. Buy the inspection, then negotiate from the number it produces.