In Turkey settlement units enlarged, developed and spread within time due to increasing population and other developments. Starting from the declaration of Turkish Republic, work immigration occurred to Kocaeli province (Izmit city) together with developing industry and trade and accordingly the population of the city increased. One of the most important problems of the city, population of which rapidly increases since 1950's is accommodation. The accommodation problem was tried to be solved by residents built by state and private sector but residential building problem gained a new dimension after the Marmara earthquake in year 1999. New areas of settlement were determined in Izmit city by the studies initiated after 1999 earthquake. The development of these settlement areas accelerated after 2000's. The urban conversion applications in recent years have also been a triggering effect for the development of settlement areas. Together with the construction of new settlement areas, cross sectional area and population of these areas increased and various problems appeared such as environmental, infrastructure and superstructure problems. Noise, air pollution, domestic wastes and visual pollution constitute the important problems in new settlement areas. Under the scope of this study, reasons of population increase and formation of new settlement areas in Izmit city, Yahyakaptan neighbourhood will be presented, findings about environmental effect of new settlement area on the neighbourhood will be submitted by comparing resident typologies and resident usage requirement and finally solid waste amount according to increasing settlements and population in the region will be examined from environmental engineering point of view, according to TUIK (Turkish Statistics Institution) annual waste amount calculation methods and solutions will be suggested for domestic waste problem