Hi Esmeralda,
Generally speaking, when a single-family home is constructed that includes an unfinished basement, any mechanical, electrical, or plumbing systems installed in that unfinished basement receives an inspection just like the rest of the home. If alterations to any of these systems are performed after the final inspection of the home (such as finishing the basement), a permit(s) would be required and additional inspections performed based on the scope of the alterations. The reference to these requirements would be in sections 108 and 113 of the following document;
http://www.dhcd.virginia.gov/images/SBC/CodeBooks/2012%20Virginia%20Construction%20Code.pdf
I hope this gets you started to where you need to go 🙂