so as the game stands right now, you could build a house around your fire and enclose it, and nothing would happen, my suggestion is that around the fire is a ‘fire probability’ zone, which basically means the closer you are to the fire, the more likely your house will burn, this doesnt have to be a large area, but the basic idea is to have a sort of ‘courtyard’ where the fire is and where your peeps can mingle and chat, thoughts?
I have another suggestion. Two types of Fire Pits. One could be like a starter, default one, where it’s basically just a pile of sticks and logs in one pile, and the other one would be a more, advanced one, which is the one we have now, which is a Fire Pit surrounded with stones. The starter and default Fire Pit could have a much larger Fire Probability, and provide less light than the more advanced Fire Pit.
Well that IS the point of all those stones around the fire - to stop it spreading 
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Anyway, I imagine we’ll see various things for pyromaniacs to indulge in at some point, but I imagine it’ll be a while yet simply because of how much other stuff has higher priority right now.
Aside from @Avairian’s post, it’s a sandbox game, so I’m sure we’ll see plenty of stuff like this. Hearth as holy icon on a hill, anyone? Hearth as the mayor’s private fire? Hearth as a signal fire in a tower?
Fire is an important aspect to manage if we expect/want unintended chain-reaction disasters in the game. But obviously, every fire needs a spark…
I expect that fireplaces/hearths that reduce the risk of spontaneous fire could be added, but the rules around how and when things catch fire ought to be laid down. I would suggest that fires only really get out of hand when the villagers are negligent, so that it feels like their fault and/or the players’ for not paying attention. For example, a stray stack of linen catches fire. With a villager on hand, there’s some panic and stomping and a rush for a bucket of water; without one, a whole house might burn down.