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The objective of this paper is to introduce what kind of discussions are happening in the world regarding carbon neutrality when we face devastating and frequent heavy rainfall disaster and to discuss what kind of role building and urban system needs to take by sharing some case studies in Japan and the world.

This paper focuses on the LCA guidelines for buildings and related information published by the Architectural Institute of Japan. First, the contents of the LCA Guidelines for Buildings published in 2013 were described. The LCA guidelines for buildings mainly consist of guidelines, an intensity database, and assessment tools, and an overview of each was given. Next, the research results and useful information disseminated after the publication were described. Specifically, the current status and issues related to LCA in the building sector, the development of useful materials and databases for assessment, and the development of supplementary tools for assessment using IDEA were introduced. Finally, the LCA guidelines for buildings, which are currently updating revision were discussed. In particular, on the contents of the guidelines, the emission intensity database, and the assessment tools, each of which can be made public at this stage were reported.

Decarbonization in the construction sector requires the spread of “environmentally friendly buildings. To achieve this, it is necessary to visualize CO₂ emissions from buildings, and while the spread of ZEB and ZEH has stimulated efforts to reduce operational carbon emissions, efforts to visualize and reduce embodied carbon emissions are not widespread enough. One Click LCA” is software that makes it possible to calculate CO₂ emissions over the entire life cycle of a building in a detailed and simple manner. This paper introduces the need for embodied carbon visualization, an overview of “One Click LCA,” and environmental product declarations（EPDs）.

In this review, we reported on our efforts for quantitative environmental information declaration utilizing LCA for buildings and precast concrete products. The history and results of our efforts to acquire CFP certification for buildings, and the significance of the use of CFP are presented. And We summarized the challenges and prospects for the future promotion of the use of CFP. In addition, he introduced a case study of obtaining EcoLeaf certification for precast concrete products manufactured by our group, and reported the significance and prospects of EPD utilization.

To realize carbon neutral society in 2050, The concept of life cycle carbon minus, LCCM. are gathering attention in construction sector.

First the concept of LCCM was applied to detached house, In 2018， The LCCO₂ evaluation tool for detached house to determine if LCCM is archived is developed. To aim further contribution for carbon neutral society, LCCM study and development committee for housings and buildings is settled in 2021 and developed LCCO₂ adapt determination tool for low-rise apartment.

In the report, we report validated contents and overview of the LCCO₂ evaluation tool for low-rise apartment.

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