Negotiations don’t necessarily end when you and the seller sign the contract to purchase. You have the right to have the home you’re buying inspected for soundness, which you can include as a contingency to your offer. That way, if the inspection reveals a serious issue, you and the seller can address it through renegotiations.
During the inspection process, the inspector is required to tell you about the condition of the appliances, heating and cooling, electrical and plumbing systems, foundation, roofing, exterior materials and so on.
Depending on where you live, you may also get separate inspections for pests and environmental issues such as radon. You’ll also learn if your future home is up to current building codes and what needs to be done to bring it up to code.
Most sellers expect to make reasonable repairs and replacements if the inspection reveals an issue that wasn’t obvious when you first agreed to terms. As long as communication remains open and civil, the seller should have as much desire to make the sales contract work as you do.