When To Verify Permits for Previous Work Done to a Prop?

[Adrian Jones]

I'm evaluating a residential property for purchase/renovation and resale. I noticed that the carport has now been enclosed and converted into a bedroom. I asked the current owners if a permit has been pulled for this work. They had no clue as it was done before they purchased the house. 

As an investor, what is my level of responsibility and/or possible liability into determining if the improvements to the house, done prior to my purchase, were done under a permit? Once I conclude my renovations and put it on the market for resale, can an inspector for the buyer require me to show a permit for the work?

Thanks,

Adrian Jones

Upper Marlboro, Maryland