This study attempts to examine characteristics of traditional housing group in Kudus urban area and its altering tendency, in order to consider possibility for observation. We found that: -Building alteration comprises change of carved wooden elements using contemporary materials, replacement of wooden-traditional houses with brick-ordinary ones, or, their removal to be empty lots; and replacement of yards with buildings; -Area alteration compriscs decrease of wooden houses, increase of brick houses, and increase of empty lots, with greater tendency along the street than in kampung; -In the last three decades, the area has lost 15% of its wooden houses due to natural decay, partial or whole sale; only 3.5% of the remaining are complete. Accordingly we recommend considerations for preservation.