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Visualizing the decarbonization effect of the renovation of “co-coono Kamikitazawa,” a co-creation project of Ts ukuruba and Marui Group Reducing CO2 emissions by 84% and waste emissions by 96%

Tsukuruba Co., Ltd.
Visualizing the decarbonization effect of the renovation of “co-coono Kamikitazawa,” a co-creation project of Tsukuruba and Marui Group Reducing CO2 emissions by 84% and waste emissions by 96%

Tsukuruba Co., Ltd. (Headquarters: Meguro-ku, Tokyo, CEO: Hiroki Murakami, hereinafter Tsukuruba) and Marui Group Co., Ltd.
(Headquarters: Nakano-ku, Tokyo, President: Hiroshi Aoi, hereinafter Marui Group) With the cooperation of Kokushikan University’s Kanako Asabuki Lab (Associate Professor Kanako Asabuki and 3 students) for the community-type renovation rental apartment brand “co-coono” (Kokuno Kamikitazawa), which opened in June 2022 as a founding business. We evaluated the decarbonization effect of the renovation. As a result, we were able to confirm that 84% of CO2 emissions and 96% of waste emissions were reduced during the demolition and construction stages of an existing building compared to rebuilding an existing building with a new building of the same scale (*1). ).
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Overview of survey results
CO2 emissions from the existing building demolition, design
supervision, material manufacturing, and construction stages of “co-coono Kamikitazawa” were reduced by approximately 544 tons, which is the amount absorbed by approximately 62,000 cedar trees in one year ( *2), equivalent to approximately 62 hectares of cedar forest and approximately 13 times the size of Tokyo Dome (*3).
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In the private residence (2nd to 4th floors) of this property, we have repaired and cleaned some of the finishing and equipment of the existing building, and are using it (hereinafter referred to as reuse) after renovation. As a result, 79% (weight basis) of materials used for the interior, fittings, and equipment after renovation in the private residence was reused. This has led to an improvement in the reduction rate of CO2 emissions and waste emissions.
In addition, regarding the operation stage, the common areas, shared residences, and work lounges of the property are powered by renewable energy, and annual power consumption is expected to be 33,200kwh, so annual CO2 emissions will be approximately A reduction of 14.4t (*4) is expected. Furthermore, in addition to in-house power generation with solar panels, we are aiming for 100% renewable energy power by adopting UPDATER Co., Ltd.’s “Minna Denryoku” and having residents join it.
Through this initiative, we learned that renovation and the use of renewable energy can be one of the solution proposals for a
decarbonized society. We will continue to contribute to the
realization of a decarbonized society by reducing CO2 emissions and waste emissions through the promotion of the distribution of the “co-coono” brand and second-hand renovated real estate.
▼Target property
Employee dormitory completed in 1993 (Suginami-ku, Tokyo, total floor area: 572.23 square meters, scale/structure: 5 stories above ground, RC construction, use: dormitory). Community-type renovation rental apartment with work lounge.
▼ Reduction effect of CO2 emissions and waste emissions due to renovation (1 building)
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About the background of the initiative
In response to the urgent issue of environmental destruction due to climate change, through the brand “co-coono”, we are renovating buildings to make homes sustainable and pass them on to the next generation, leading to a sustainable and environmentally friendly stock utilization society. We aim to transform In order to accelerate our efforts, we believe that it is necessary to visualize and disseminate the reduction effects to expand the circle of sympathy in society, which led us to announce the results of this demonstration. Comments from survey members
・Associate Professor Kanako Asabuki, Kokushikan University
“We have carefully examined whether each component of the existing building can continue to be used through repairs, etc., which has led to a further improvement in the reduction rate of CO2 emissions, and we have high expectations for the future development of this sustainable initiative.”
・Kokushikan University Kanako Asabuki laboratory student
“I am very happy to be involved in this research. I feel that the renovation business has multiple appeals, such as environmental and cost aspects. During my research, I felt that the need for this would increase.I hope that the results of this research will serve as a catalyst for new projects in the future.”
-Profile of Associate Professor Kanako Asabuki, Kokushikan University- 2002 Graduated from the Department of Architecture, Faculty of Engineering, University of Tokyo. In 2007, completed the doctoral course at the University of Tokyo Graduate School of Frontier Sciences. PhD (environmental studies). After working as an engineer at the Ministry of Land, Infrastructure, Transport and Tourism, he is currently an associate professor at Kokushikan University. I am researching resource recycling in construction and the environmental load associated with renovation and demolition of buildings. Wrote (co-authored) “Architectural Production Reference with Charts” (Shokokusha).
(*1) Comparison of CO2 emissions in existing building demolition, design supervision, material manufacturing, and construction stages and waste emissions in existing building demolition and construction stages “co-coono” Source: “CO-coono Carbon dioxide emissions in Kamikitazawa Effect of reduction in waste volume and waste generation” (okos, Kanako Asabuki Laboratory, Kokushikan University)
(*2) It is estimated that one hectare (1,000 standing trees) of 36- to 40-year-old cedar plantations that are properly cared for absorbs approximately 8.8 tons of carbon dioxide per year (estimated by the Forestry Agency).
(*3) Tokyo Dome (entire building) is 4.67 hectares
(*4) Calculated by multiplying estimated consumption by emission factor (0.000433t-CO2/kWh published by the Ministry of the
(*5) The evaluation was conducted by calculating the types and quantities of materials from the completion drawings and quotations for existing buildings and renovations, and using the “General Building LCA Tool Ver5.01” published by the Architectural Institute of Japan. Calculate CO2 emissions
(Since collective housing is made up of an extremely large variety of materials, materials that are small in volume and emit little CO2 are omitted from the input, and external structures and plants are not subject to evaluation.)
(*6) Evaluation uses drawings of existing buildings and waste records from renovation work to calculate the type and amount of waste originating from the building itself.
About “co-coono Kamikitazawa”
“co-coono”, which was born through co-creation by Tsukuruba and Marui Group, is based on the concept of “rental housing where you can live alone and challenge yourself by living”. It is a community-type renovated rental apartment with a work lounge targeting generations. ▼ Property overview
Property name: “co-coono Kamikitazawa”
Location: 3-1-3 Kamitakaido, Suginami-ku, Tokyo 168-0074
Access: 6-minute walk from Kamikitazawa Station on the Keio Line Structure: Reinforced concrete construction
Scale: 5 floors above ground
Total number of units: 19 units (1R: 14 units, share house: 5 units) Floor plan: 1R…19.31 to 22.22 square meters
Share house…7.12~12.40㎡
Rent: 54,000 yen to 73,000 yen
Common service fee: 7,000 yen to 9,000 yen
Work lounge usage fee: (tax included) 2,200 yen/month
Design supervision: Tsukuruba Co., Ltd.
Construction: Aim Creates Co., Ltd.
Management company: Marui Home Service Co., Ltd.
Co-working management: okos Co., Ltd. Tsukuruba Co., Ltd.
“Private residence” (1R: 19.31 to 22.22 square meters)
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1R private space is secured as an exclusive area for those who want to value not only time to share with others but also time to face themselves. Toilets, showers and kitchens are available in the private room.
“Shared Residence” (7.12-12.40 square meters)
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For those who want to share the living space with their neighbors, we have a common area where you can relax with your neighbors while minimizing the facilities in the private area.
“work lounge”
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It is a workspace that creates a “connection with just the right sense of distance with a diverse group of like-minded people.”
▼ Click here for details and application
▼ co-coono
▼ Marui Home Service
■ About Marui Group
MARUI GROUP is a company that is innovating its unique business model and business structure that integrates retail and finance in line with the changing times and customer needs. We are developing a business that is close to each and every customer, with the aim of picking up the needs according to the actual lifestyle of our customers and providing fine-tuned services. In particular, the fintech business centered on the Epos Card, which has more than 7 million members, continues to grow at an average annual rate of 16%, and is
characterized by a membership structure in which more than half of the members are young people under the age of 30. I have.
■ Marui Group Co., Ltd. (TSE Prime: 8252) Company Profile
Trade name: Marui Group Co., Ltd.
Established: March 1937
Representative: Hiroshi Aoi, Representative Director, President and CEO Location: 4-3-2 Nakano, Nakano-ku, Tokyo
■ Tsukuruba Co., Ltd. (TSE Growth: 2978) Company Profile
Under the mission of “creating the desired future through ‘place invention'”, we are designing places that combine design, business, and technology. The main businesses are “cowcamo”, a distribution platform for used and renovated homes, “Urucamo”, a matching service for people who want to sell and buy homes, and “co-ba”, a shared workplace that supports all kinds of challenges. )” and other shared workplace businesses.
Trade name: Tsukuruba Co., Ltd.
Established: August 2011
Representative: Hiroki Murakami, Representative Director and CEO Location: Second Ikura Building 2F, 1-1-5 Kamimeguro, Meguro-ku, Tokyo URL:
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