This study is to investigate the present status of dwelling spaces and deduct sustainable elements in transformation of them focused on traditional houses that exist in the urban area of cheongju city in Korea. In alteration and extension of these traditional houses, scale of a private room became larger as it has been connected and expanded, the exterior main hall(Daecheong) became the interior living room, and the conventional kitchen was westernized and changed from K type to DK or LDK type. The toilet located at outside was installed by the attached aisle(Toetgan) inside and the existing room. The extension was completed with equipments, storage space, and rental accommodation.
A study on methods is using questionnaire which 12 items of attraction in Urban Traditional Houses and experimental study focusing on residents in Seowoon-dong and Seokgyo-dong where traditional houses are concentrated. Residents of urban traditional houses were categorized 6 sectors, caused by the road construction. The urban spatial structures of these sectors are maintained, comparing with aerial photography on 1960''s. And residents recognize eco-friendly attraction higher than awareness on traditionality, locality and aesthetic beauty. It is proposed to prepare political alternative about traditionality, locality and aesthetic beauty. Low awareness about traditionality and locality have influenced that residents hope the change of the traditional houses.
And attractive items are classified with general and overall survey items, advantage of ''Hanok'' in urban area. These can also be classified with 5 items which are space, health, material, form, and image, followed by a further categorization into 15 mid-categories and 45sub-categories. We administered a questionnaire survey based on these 45 sub-categories.

The conservative and sustainable elements in the various transformation of them are as follows.
1) It was to maintain 3 rooms such as main room(anbang)-main hall(daecheong)-detached room(gunnunbang).
2) It was to sustain the circulation of kitchen and arrangement of the ㅡ type worktable even though it was westernized.
3) Extension of storage space was completed less than 600mm within the eaves. Although there were functionally and structurally many changes in 18 houses, 4 houses had maintained wooden floor of main hall, 5 houses long planked wooden floor of the attached aisle, and 12 houses rafter ceiling of the main hall and the attached aisle.

Secondly, in regard to the studied focusing on residents in Seowoon-dong and Seokgyo-dong where traditional houses are concentrated.
1) The urban spatial structures of these sectors are maintained, comparing with aerial photography on 1960''s.
2) Residents recognize eco-friendly attraction higher than awareness on traditionality, locality and aesthetic beauty. It is proposed to prepare political alternative about traditionality, locality and aesthetic beauty.
3) Low awareness about traditionality and locality have influenced that residents hope the change of the traditional houses.

Thirdly, in regard to the analyzed of questionnaire items and results of 13 preceding studies. And attractive items are classified with general and overall survey items, advantage of ''Hanok'' in urban area, and image of Hanok-density urban area. These can also be classified with 5 items which are space, health, material, form, and image of ''Hanok'' in urban area.
1) Space items are composed with ''use of a space'', ''cosiness'', ''garden'' and ''floor and ondol(korean floor heating system).
2) Health items are composed with ''lighting and ventialtion'', ''a sense of the season'' and ''natural material''.
3) Material items are composed with ''natural beauty'', ''wooden'', ''changhoji(traditional Korean paper made from mulberry bark for doors and windows) and hanji(traditional Korean paper handmade from mulberry trees), ''rafter'' and ''new materials''.
4) Form items are composed with ''attractive appearance'', ''simply decoration'' and ''traditional elements''.
5) Image items are composed with ''crowding'', ''traditionality and historicity'', ''dichroism'' and ''warmth''.

Fourthly, in regard to clarified the perception of residing within urban traditional houses, Hanok in Cheongju, by questionnaire survey prepared with 5 categories, 15 mid-categories and 45 sub-categories from advanced studies about advantages of Hanok. Attractive items were correlation with a residents'' attributes such as respondents'' gender, age, and length of residence.
1) The males highly evaluate the warmth of image attractive, and the females highly evaluate the harmony of form attractive according to gender.
2) The higher the age group highly evaluate the all-round attractive, and sixties residents highest evaluate the space, form, image attractive.
3) The protracted residents highly evaluate the open of space, timber of materials attractive according to length of residence.