Bad foundation
It may need major, expensive structural repairs. Consider walking away unless you can negotiate a price concession to cover repair costs.

Worn roof
You'll probably have to replace it. If the seller won't do the work, negotiate a lower price or a credit at closing to help cover the cost.

Outdated wiring
This is common in old homes and can be unsafe and expensive to correct. Get an estimate from an electrician, then negotiate with the seller to help pay the cost.

Damaged shower pan
If there's water damage beneath the shower, it can be an unwieldy and sometimes expensive repair. Get an estimate from a contractor before you negotiate.

Extensive termite infestation
This can mean major, expensive structural repairs, plus the cost of treating the termites. You may want to avoid this house unless you can get the seller to help pay.