In the picture to the right, you can see fish drying in the background on two poles.
Families built houses out of whatever materials they had on hand--where wood was common, they used wood. Where wood wasn't common, people built houses out of stone or sod (dirt.) Some of the oldest still-standing houses in the world were built of stone and surrounded by sod in very cold places, thousands of years ago. A stone house is very sturdy and can last for a very long time, after all.