welcome!
i don't know anything about prices in washington state, so can't comment on that.
if you have financing and/or the money, hurray! i totally recommend buying a turnkey b&b - one that is already operating as a b&b with licensing and permits. the biggest hurdle i hear about are folks buying amazing property with the IDEA of turning it into a b&b only to discover that the town/city/county/state/neighborhood zoning or whatever won't allow it. frustrating, heart-breaking and $expensive!
don't let anyone tell you 'you can do that here, no problem' without checking ... even after you check with all the departments you think you've contacted, a new one can jump up and say 'no, you can't do that'.
you should take an innkeeping seminar, preferably one where you jump in and act as innkeepers. one that goes over the bookkeeping aspects, the financials, marketing, and guest relations. how about a 'staycation?' so you know just what you are getting into.
i loved innkeeping. it was exhausting, frustrating and didn't pay me very well - although the place did well, the overhead was very high. it was also fun and allowed me to be creative in any way i wanted.
but every detail of the place is in your hands ... cleanliness of the whole building not just the guest rooms and dining area, furnishings, gardening, landscaping, the works. don't forget shopping, cooking, serving, cleanup, socializing (depends on the guest how much they want), reservations, scheduling, maintenance and marketing, marketing, marketing. the more help you have, the better, so a team of two is miles ahead of one alone. i did it all with the help of an adult son who took on the task of website building (yes you can pay someone to do that if you have the money), and was my handyman and night relief person ... without him, i couldn't have done it because by about 6 pm i was exhausted. plus i had no privacy and no way to get away. you must consider this very real aspect of living this way.
a toilet clogs or stops working? it has to be taken care of NOW. jammed doors, broken thermostats, lights out, clogged sinks, lockouts, window problems, too hot, too cold, water in the shower too cold, ants, flies, bees (or mice!), power outages, internet goes on the blink, tv reception fails, noisy guests or noisy neighbors, parking problems, broken ovens, stoves, microwaves, dishwashers, washers, dryers, flooded basements ... the list goes on and on. anything that can break, get stuck or stop working in a regular house ... multiply that by the number of guest rooms you have and also keep in mind that some (many? most?) guests are not as 'gentle' with your b&b stuff as they are at home.
i think you have to have a certain amount of stars in your eyes to start this kind of venture ... i did. to me, it was so worth it. i will do it again some day if i can ... but
with help unless it's just a few rooms.
this forum was a life saver for me. there is great advice here ... there is also venting because you need that, too.
best of luck to you..