Did Celtic housing differ according to wealth and location?

From brochs in the Pictish kingdoms of Scotland, roundhouses in Ireland and Britain and rectangular houses on the continent, Celtic housing came in many varieties. But there were also adaptions to mountainous areas, such as Switzerland, rocky plateaus, such as central Spain and the shores of lakes. There was also changes in building styles and construction techniques over time. This source-based activity is designed for students of the NSW Ancient History Syllabus for the Australian Curriculum.
Preliminary course
Investigating Ancient History – Case Studies
List A: Case studies from Egypt, Greece, Rome, Celtic Europe
A8. The Celts