Some of these houses are registered, recently, according to law number 144 of 2006, so called  “Regulating the demolishing of Non-dilapidated buildings and  establishments, and the preservation of architectural heritage” and few of them  are registered according to law 117 of 1983. They were constituted one third of  the houses in Cairo at Ottoman period. Nowadays, around 20 houses are survived  because the preservation policy in Egypt focuses mainly on the large houses.
The construction systems of these houses consist of stone masonry on the ground and first floors levels. The other floors are made of rod brick. Roofs are built from beam wooden and floors are made of slab stone. Windows are covered with perforated wooden screen "Mashrabiya" that has large openings (Figure 21). Area of these houses are between 75 m2 to 180 m2 \citep{rogers1993habiter}.
The ground floor contains main entrance,  stair, store, and courtyard that is partially covered. First floor contains  living rooms. Second floor contains bed rooms. There is unique floor plan for  this type of houses.