Building reuse represents a significant opportunity to avoid carbon emissions in the critical near term, but until recently, quantifying the carbon “savings” in a retrofit or reuse versus new construction has been arduous, often fraught with inaccuracy, and lacking in standardized methodology. Architecture 2030’s CARE (Carbon Avoided Retrofit Estimator) Tool has dramatically streamlined the process, enabling owners, communities, and design teams to quickly quantify the carbon benefits—and understand the value of reuse.
Based on simple user inputs about energy targets and potential building interventions, the CARE Tool estimates both the operational carbon emissions (from energy use in the building) and embodied carbon emissions (tied to building materials) associated with reusing and upgrading an existing building or replacing it with new construction. The tool was developed by design experts Larry Strain of Siegel and Strain Architects, Erin McDade of Architecture 2030, and Lori Ferriss of Goody Clancy.
Now, owners, developers, community leaders, and design and planning teams can get answers to nuanced questions about reuse. For example: Retrofitting an existing building to zero operating emissions will almost always be the lowest carbon option. But what if the retrofit achieves only a 50% reduction and you can replace it with a zero operating emissions building? What if a large addition is required to increase density or accommodate new uses? How does climate zone, grid intensity, and the condition of the existing building affect those considerations?
Carbon savings visualized as total embodied and operational emissions
Outputs are visualized as total embodied and operational emissions over a specified time frame as well as cumulative emissions over time, for three scenarios: the existing building, the renovated building, and the new construction. Results can be compared to determine the lowest total-carbon approach and the time frame in which that occurs.
“We’ve done deep-dive simulations of up-front (embodied) carbon emissions as well as projected carbon emissions from building operation, spending hundreds of staff hours,” says Z Smith, Principal and Director of Sustainability and Building Performance at EskewDumezRipple. “The CARE tool allows us to demonstrate—in minutes—the benefits of renovations, not just to the human experience of the buildings, but to their environmental footprint. This is a great addition to the tools architects need to make the case for the rapid transformation of our existing building stock.”
The CARE Tool can also be used by policymakers, planners, building owners, developers, heritage building officers, architects, and educators who are interested in a pre- or early-design, high-level assessment of the total emissions impact of building reuse versus replacement. With retrofits on the rise and the urgent need for climate action, tools like CARE fill a critical gap in our understanding and valuation of the existing building stock as an important climate asset.
The CARE Tool is currently being funded by a 2020 ONEder Grant, 2021 Moe Family Fund Grant through the National Trust for Historic Preservation, and the 1772 Foundation. The CARE Team is currently seeking additional development support.
Access the free CARE tool here.
Related Stories
| May 18, 2011
Eco-friendly San Antonio school combines history and sustainability
The 113,000-sf Rolling Meadows Elementary School in San Antonio is the Judson Independent School District’s first sustainable facility, with green features such as vented roofs for rainwater collection and regionally sourced materials.
| May 16, 2011
USGBC and AIA unveil report for greening K-12 schools
The U.S. Green Building Council and the American Institute of Architects unveiled "Local Leaders in Sustainability: A Special Report from Sundance," which outlines a five-point national action plan that mayors and local leaders can use as a framework to develop and implement green schools initiatives.
| May 16, 2011
Virtual tour: See U.S. Green Building Council’s new LEED Platinum HQ—and earn CE credits
A virtual tour of the U.S. Green Building Council's LEED Platinum HQ is available. The tour features embedded videos, audio podcasts, and information on building materials and products used throughout the space. By taking the virtual tour, professionals can earn GBCI Continuing Education hours for the LEED AP with specialty and LEED Green Associate credentials.
| May 10, 2011
Cascadia Green Building Council report urges net-zero water systems for multifamily and commercial buildings
A new report from the Cascadia Green Building Council offers best management practices for designing safe, efficient, and effective net-zero water systems for the multifamily, commercial, single-family, and neighborhood market segments.
| May 10, 2011
Greenest buildings: K-12 and commercial markets
Can you name the nation’s greenest K-12 school? How about the greenest commercial building? If you drew a blank, don’t worry because our friends at EarthTechling have all the information on those two projects. Check out the Hawai’i Preparatory Academy’s Energy Lab on the Big Island and Cascadia Green Building Council’s new Seattle headquarters.
| May 10, 2011
Solar installations on multifamily rooftops aid social change
The Los Angeles Business Council's study on the feasibility of installing solar panels on the city’s multifamily buildings shows there's tremendous rooftop capacity, and that a significant portion of that rooftop capacity comes from buildings in economically depressed neighborhoods. Solar installations could therefore be used to create jobs, lower utility costs, and improve conditions for residents in these neighborhood.
| May 6, 2011
“Net-Zero Energy Buildings and Homes” White Paper Q&A at AIA
“Zero and Net-zero Energy Buildings + Homes,” a 64-page White Paper that proclaims “the next frontier in the green building movement,” will be the topic of a 1-hr Q&A with 6 “NZEB” experts at the AIA Conference + Expo, Friday, May 13, 11 a.m. to 12 noon, at the Morial Convention Center (Level 2, Room R06), New Orleans.The 40,000-word report from Building Design+Construction provides a road map for the $350 billion design, construction, and real estate industry to develop “net-zero” buildings and homes that generate as much energy as they use, such as the new Research Support Facility at the National Renewable Energy Laboratory, in Golden, Colo.
| May 3, 2011
More jurisdictions adopting International Green Construction Code
More jurisdictions are utilizing the new International Green Construction Code (IGCC) as a tool to address sustainable construction for new and existing buildings. Fort Collins, Colo., and Kayenta Township, Ariz., are the most recent in a series of local and state governments that have adopted the IGCC,
| May 3, 2011
What green building types are most likely to get noticed?
The general public isn’t terribly aware of green buildings in their area, according to a TD Bank survey of 1,510 consumers within major metro markets in its Maine to Florida footprint. The bank conducted the poll to better understand consumers’ knowledge of green or sustainable buildings. According to the poll, these green buildings are most likely to get noticed.
| May 3, 2011
Green building materials in U.S. to exceed $71 billion in 2015
Demand for green building materials is projected to expand 13.0% annually to $71.1 billion in 2015, slightly outpacing the growth of building construction expenditures over that period, according to a new study from The Freedonia Group, Inc., a Cleveland-based industry market research firm. While the rising use of green materials will support gains, the most important driver for demand will be the expected rebound in the construction market.