Nowadays, time is money. The longer it takes before it is ready, the more expensive the house is. Back then, building a new house meant you couldn’t spend the same time on something else. Most medieval people were self-sufficient: they had to grow their own food, tend their own cattle and indeed, build their own houses. Therefore, construction was done after the agricultural season (October–February) when things were a little more quiet. Presumably, people cooperated when building their houses, and menbers of the family and neighbours were employed. According to experiments, it takes a team of 10 experienced constructors about 5 months to get a house ready.