From “Ask Kit!”:
Q: How a “Potential B & B” can become a real B&B in New york state?
A: You’ve asked a much more complex question than you may have realized. Are you turning your own home, or a home you want, into a B&B for your use? You really need to take a seminar to get all the details, but the first step for you to take is to ask the local planning and zoning officials what their requirements and restrictions are. The answer to that question will determine lots of your path.
Good luck.