Sometimes I build a small base that lasts me a long time, and I improve it over time while observing zombie behavior. Other times I don’t build anything at all and only start building something proper when I move to the wasteland. I don’t like making separate bases, because if I’m worried that my base won’t survive a horde and I’ll lose my stuff, that just means there’s something I need to improve so I prefer to do it properly and build it solid from the start. Besides, I prefer having everything in one place.