Ohio's residential property disclosure form asks directly about water intrusion in the basement, and a known history is a required disclosure. Documented repair work is a far better answer than an unreported history.
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The disclosure form does not leave much room for interpretation here. It asks about water intrusion and about known material defects, and a basement that has taken water is squarely within both. The obligation attaches to what you know, so a history you experienced, a repair you paid for, or a report you received all belong on the form. What sellers sometimes get wrong is thinking a completed repair means there is nothing to disclose. It works the other way. Disclosing a resolved problem with the invoice, the scope, and a transferable warranty attached is a strong position: the buyer sees a known issue that was professionally addressed, priced, and guaranteed. Concealing a history that the buyer's inspector finds anyway, or that emerges the first wet spring after closing, is the fact pattern that produces claims. A practical sequence for a seller in this position. Get the work done and documented rather than painting over the evidence. Confirm whether the warranty transfers and what the transfer requires, since many in this trade do transfer and some require notice within a set window. Put the paperwork in the listing file where a buyer's agent will find it. Complete the form accurately. Permit requirements and the rule on where a sump may discharge are set by the local building department and the sanitary district, so confirm both before work begins. One note on timing that helps sellers: waterproofing work done before listing is priced as a repair, and the same work negotiated during an inspection response window is priced as a concession, usually higher, on someone else's schedule, with a single quote and no time to compare.