It would really be nice if there were a range of different materials available, and clearly visible, in the environment, like wood, thatch, branches and twigs, but also mud (with thatch) for bricks, and of course stones. Such was mostly the case in Banished, and to a limited degree also Children of the Nile, Patrician, Anno XXXX, and others. And while it was just as possible to build a hut out of mud bricks in Neolithic France, or a hut out of timber in the Levant, the opposite was generally true, since timber was lacking in the Levant, and mud bricks were difficult to maintain in rainy France. It would be up to the player. I guess either the game would have a completely different set of buildings depending on which “biome” you chose, to which one has to stick, and which means the buildings requirements would be less of one resource and more of the other; or the player can always slide meter or so, to build a hut more out of mud bricks, or more out of wood, or more out of stone, and so forth. I guess the former would be easier to do, especially if only more famous biomes were available, like the the Nile Valley, the Levant, Greece, central Italy, and Atlantic France… Of course, most of this is far, far in the future.
In any case, there should surely be a lot of variety in the houses. Like… nine different varieties of a standard house, with certain things even more randomly generated, like the colours of certain fabrics, the nuances of the mud façade, or the thatch of hut roofs. Maybe, for example, of the maybe four windows (obviously not glass) of a house, the number of windows that are open could vary? Simple enough thing to create, I should say, especially if the same window model could be reused in other buildings. I’m sure the developers will include something similar to this later on.