if you aren't buying with your husband get a prenup made before you buy, otherwise he is entitled to half your house regardless of whether it was your money or his when you divorce, if you divorce. Not protecting your future would be silly in this day and age for anyone. As for step kids having a space for them regardless of whether young or teenage will allow them to still feel welcome if they ever need a place to stay for a while. But it's up to you as it's your house. But get a prenup before you buy and stipulate he has NO claim to any house you buy with your money. Nor do his kids.

I would talk candidly to the kids

Your husband can save up and stay at a motel with them 4 nights a year.

I think 18 too....

Hi they only stay about four nights a year, the boys are 15 and 17. We pay a lot to rent a huge house and it will be cheaper to buy a small three bedroom as I have 2 kids also.
Not buying a house with my husband as he terrible with money and never has savings I keep my money separate. It won't be half his house, not sure exactly what I will do, maybe put it in my kids names.
I don't want to keep paying for 2 bedrooms that don't get used.

Need more info, thrir ages? Why you ate buying without hubby? Will he be living there? Etc But, my parent's sold our family home when I was 21. They moved into a shed for a few years while they built their house. They made bedrooms for my younger sister and brother in the shed but not me. I was building a house with my boyfriend (now husband) but had to move in with my inlaws for 6 months. Id go stay at the shed sometimes. I tell everyone that I didn't move out of home, my parent's moved out on me! Anyway, if they're 18+ I don't think you HAVE to provide them with a bedroom each. If there is space for them to visit and they are welcome i think that's enough.

I have many questions because I don't think there is sufficient information to offer my opinion...
But I'm sure you've made up your mind what you are going to do anyway. So enjoy your house. ☺
Although I am confused why you aren't buying with your husband, and if you divorce he is still entitled to half of it anyway

So is your husband going to live in the house?

Well you could talk to the step kids about it. How old are they. Why are you married but not buying the house together? They can’t expect their own room anyway, but I think a dedicated room for them to share is fair. How many of them are there? How many kids do you have and ages

18

If he wants an opinion he can chip in. Otherwise he should just be grateful there's a room they can share when they stay.

They're part of your life, like it or not. Depending how often you have them you still need at least an extra room or more to accommodate them when they're there. Or buy a house for yourself and go