Safety issues with garage conversion?

[Bienes Raices]

I think family room (front left in photo) was converted from a garage or carport at some point (see the wood in front, while the rest of the house is block). However, the heated and gross square footage and number of rooms on the appraiser's website matches the information in the MLS ad, so I assume the county at least knows about this conversion, although I can find no proof that it was ever permitted.

Has anyone here ever had any electrical or safety issues with tenants after buying one of these conversions? That is my concern, since I don't know if the wiring or building in that room was done up to code or not. Should I go ahead and make an offer or is this something to be concerned about?