There are two common types of termites, drywood and subterranean (please excuse my potential spelling error)…
As sdr said, 99% of all homes have drywood termites in one form or another. However if the home has subt termites I would be more concerned. The treatment for these is much more expensive and much more prone not to work. Personally I may pass on a home with these types of termites.
For the drywood termites, simply set up an annual contract with a reputable company.
