Small rental apartment in cold region were analyzed on following 3 aspects.

1. Real situation of Small rental apartment in Hokkaido were analyzed and it was revealed that internal stair-case type apartment increased in 2000s and row house type apartment increased in 2010s.

2. By comparison of Hakodate city and Muroran city survey, major house builders were related to increase of row house type apartment.

3. Questionary survey for registered architect in both city, increase of internal stair-case type apartment in Muroran were related to requirement of clients.