Although the continuous increasing of energy price, the energy consumption in all sectors is still increasing. This eager energy consumption participates in in the increase of carbon dioxide emissions, which is the main reason for the global climate warming. Residential energy consumption represents more than 40% of total energy consumed in most countries, reducing this consumption offers an important opportunity for conserving natural resources, and environment. In this paper, we study the energy consumption during the period of 2000-2010 in the residential sector in Setif area, Algeria, and compare its compliances with to the Algerian building regulation. To achieve this purpose, 600 residences were investigated, these dwellings were chosen among a bigger set of data, 146 houses (116 attached houses, and 30 detached houses) representing 25% of the total surveyed houses, are investigated. 454 flats, which represent 75% of the studied dwellings, are divided according to the number of their external envelope, in 6 types, A (3 vertical external walls + 1 horizontal as a roof), B (is the same as A, but the horizontal is the floor), C (3 vertical walls), D (2 vertical external walls + roof), E (2 vertical external walls), and F (2 vertical external walls + 1 horizontal (floor). This represents approximately the rate of type of dwellings at the national level. It has been very clear from this investigation that found that, the results Calculations according to Algerian national standards authority showed a large discrepancy with directives of the Algerian energy agency for flats and houses.