Not Filing=DOB Inspection?

I had a lot of electrical, plumbing and drywall people come in and give me bids on the work. If one of those people, which I have not hired, wants to be nasty and report that I am doing some work without a permit- calls up DOB/city and tries to get me in trouble, how easy will that be for him? will the DOB come here and say they want to go into my house to inspect it? Do I have to let them in? Anyone had that done to him?

By Williams |