The Research deals with the negative phenomena which appeared in the urban scenes of the  Iraqi cities after 2003, particularly trespassing the architectural design of the urban Individual houses.  Many academic researchers , critics, and cultural circles, drawn attention to the impact of  political and cultural variable change on such phenomena  without detailed  analysis . The research problem  is set according to central questions : If the phenomena is the trespass , whatare the sides which are being trespassed  in the division of the individual house? , If the diagnosis of the phenomena denotes perceived repetition of the cases , So what's size of this transposes on the architectural design of the individual house? , and what are its connections  socially and economically ? The research problem diagnosis by: The lack of knowledge about the impact of the phenomena of trespassing on the architectural design of the individual house specifically?.The research target is to explain the range  of the spreading of trespass in these houses with objective , social , economical investigation, Then clarify the phenomena's impact on the architectural design of individual house in Baghdad. The theoretical frame is built  to extract the research  indicators ( economic, social and  design) theoretically , then  enhance them with the study of the development of the urban house in Baghdad along the 20th century. The indicators were applied on (12) samples were distributed on (2) residential districts, (Palestine Street, AL- Sadr City) which they are various in the residential areasand they different in the social and economic level of the their dwelling, and their houses have modifications and divisions, then find its impact on the designing level of the individual house in Baghdad after 2003. The results showed that both districts in Baghdad houses have this kind of illegal division and (non.efficient , non functional relationship and some of them non ventilation)  , the spread of the phenomenon reflects that there are special details in the methods of division and the modification of the houses ,That should be a widely reviewed  to get to limit this Regulations in precedent phenomena and regain the residential cultural of the city.