Generally, the traffic noise occurring on roads has emerged as an important factor that harms the residential environment. Because of the noise, residents living near roads have been causing civil complaints. Therefore, it is required to evaluate road traffic noise during the whole procedures of building an apartment, ranging from design to construction. And if an evaluated noise exceeds regulation standards, some measures to prevent the noise, such as installation of soundproof walls, and other kinds of plans should be prepared. In this point, this work measured road traffic noise in a site of housing land development, investigated its characteristics, and used a simulation program to predict outdoor noise on the basis of the data about traffic effect evaluation, design drawing, and the data about site measurement. Based on the prediction, it also predicted indoor noise. It is judged that this research will serve as an important material to establish soundproof measures on the basis of prediction of traffic noise in building an apartment.