Abstract: The random architecture is one of the main interest subject related to the third world architecture. The random housing in Yemen, Sana’a city as well as other big cities is mainly affected by several reasons such as industrial activities government planning and conditions. In the present study, the development and growing in random housing, causes, effects, advantages, disadvantages and recommendation as one of the main sectors in Sana’a city are expressed in details with the some properties of the random housing in some other cities in the third world.