Quite a lot of Finnish houses are build from prefabricated elements. One would typically just build a foundation and trucks would bring in the wall structures

Quite a lot of Finnish houses are build from prefabricated elements. One would typically just build a foundation and trucks would bring in the wall structures (not sure about roofs) and raise them. After that it's only about hvac, outer walls and interior. Also, Finnish construction standards are quite high, not only because of climate :)