With a view to clarifying the conditions of house remodeling work from the ecological standpoint, we made a questionnaire survey covering the detached houses in a residential area in Nara which was developed more than 35 years ago. The results of the survey are as follows: 1) Of the remodeled houses, 35.5% had been expanded, 38.6%, had been reconstructed, 25.0% had been partially remodeled, and 15.2% had been completely rebuilt. Those remodeling work had taken place on an average of 20.1 years after their completion: in other words, their life span is quite short. 2) The nature of the above-mentioned remodeling is the repair of the exterior finish, the reform of water pipe arrangement, the alteration of the interior, or the change of the house layout. The remodeling of low impact such as the reduction of energy consumption was rare. 3) The dwellers wanted their house improved from the standpoint of convenience, i.e., to suit the change of their lifestyle. Consideration to the aged members of their family and to the improvement of the durability of their house were evident. However, not much was meant for the energy conservation and the use of natural energy. 4) The dwellers seem to be fully aware of the importance of ecological improvement in view of the need to deal with the aging society, and to make their house durable and earthquake-proof. Although they are aware of the need to choose adequate building material for the benefit of their health, they seem to pay little attention to the use of recycled materials. There seem to be little demands for planning to achieve energy conservation that would make use of natural power.