The average rate of Iranian population living in housing units built with non-durable building materials (wood, clay, mud and straw) was 15.3%.
Hormozgan Province registered the highest rate of population living in such housing units with 63% and was followed by Sistan-Baluchestan Province with 44%.
The percentage of population living in durable housing units (with steel, concrete and bricks used as construction materials) was the highest in Alborz, Qom and Tehran.