Well if that's the case I'm gonna have to be a pedant and say that you can perfectly well answer 'yes' or 'no' to the question.
No definition of a house states that it must have stairs. It's simply a structure serving as a dwelling for one or more persons.
Similarly, a bungalow would always be defined as a HOUSE with one storey.
If that isn't what this trick question's all about, ignore me. But know that I'm right.
It is indeed a trick question, but if I explained the answer, nobody would get it. So I'll just sit here quietly and admire everyone who has stairs in their houses!
Good day. Yes, I have. Why do you ask this? If you want to build stairs I can say that it is not so simple and if you don't have some experience in building, I think better will be to use professional help. In such case you will save your time and nerves. But if you want to count materials by yourself, this calculator can really help. Good luck!