The purpose of the study is to propose the basic data for an aged residential building suitable for Korean environment and it is based on the outcomes of investigation on The Aged Care Residential Service in Australia including the scale and arrangement of private zone and specific characteristics of each compartment. The brief outcomes of the research are follows as. - The Aged Care Residential Services have been functionally running divided into Nursing home, Hostel and Retirement Village by the classification standard of the residential classification scale. - Single bed rooms have 75% of total residential area and the square of single bed room is about $20 extrm{m}^2$and that of two-bed room is about $31 extrm{m}^2$. - There are two types of ensuite such as one single-bed room and one ensuite and bed room for two or three persons and ensuite type. The square of ensuite varies as single is 50∼60%, single for public is 25∼30%, and double for public is 15∼20%. - Assisted bathrooms are generally located in the middle of building and it is suggested to be occupied about $1.25 extrm{m}^2$ per person. Sitting rooms are two types such as room type whose square has about $12 extrm{m}^2$ and a lounge type has $16 extrm{m}^2$.