Alternative design and construction methods to build wooden houses easy to deconstruct and easy to recycle were developed and the technical guidelines were formulated and the design and construction manual for remountable wooden constructions was compiled. The recycle and reuse technologies to reduce the waste produced in the process of dismantling wooden buildings were also developed and the technical guideline was drafted. To calculate the environmental impact of the wooden buildings and the effect of the alternative technologies the environmental impact calculation tool was developed. The project was composed of the following three research subjects: (1) Development of the design and construction methods to reduce the waste products in the wooden building activities, (2) Development of the recycling technologies for building materials and components, (3) Development of the evaluation technologies.