Green Globes Tops LEED in Federal Review, But Barely
By Paula Melton
6/17/2014 UPDATE: BuildingGreen has published our own definitive analysis comparing and contrasting LEED and Green Globes. Readers can access it here: LEED vs. Green Globes: A Definitive Analysis.
6/5/2012 UPDATE: GSA has pushed back the dates of the listening sessions. Please read below for more details.
5/11/2012 UPDATE: This article has been updated to incorporate comments from GSA, including opportunities for public comments that will influence the outcome of the review process.
After almost a decade of requiring LEED certification for all federal building projects, the U.S. General Services Administration (GSA) is suggesting inthat the Green Globes rating system aligns slightly better than LEED with federal requirements for new construction, while LEED remains the most compatible green building rating system for existing buildings.
The differences identified between the two systems are not marked, and the report acknowledges that apples-to-apples comparisons are difficult. The reviewers also claim the report “does not recommend a certification system,” but repercussions remain to be seen;was used to justify GSA’s continued use of LEED.
To judge the “robustness” of green building certification systems, the reviewers compared federal guiding principles for building projects against features of three voluntary rating systems—Green Globes, LEED, and the Living Building Challenge—considering new construction separately from existing buildings. In keeping with the requirements of the Energy Independence and Security Act of 2007, the goal was to identify which systems allow projects to meet federal requirements with the least extra effort by project teams.
Findings regarding new construction
For new construction, Green Globes directly addresses the highest number of federal priorities—25 out of 27. However, as with all of the rating systems analyzed, project teams have to make an extra effort in several categories in order to meet federal guidelines.
• Although Green Globes has no prerequisites, optional credits helped the system match federal green building requirements more closely than those of any other rating system for new construction. Fifteen of these credits, however, would have to exceed the requirements laid out by Green Globes in order to match federal needs. Green Globes does not address two federal requirements at all: benchmarking and building system controls.
• LEED prerequisites guarantee compliance with four federal requirements (something Green Globes doesn’t do at all), and optional credits provide compliance with seven more requirements. Nine credits would have to exceed LEED’s requirements in order to meet federal standards. LEED does not address seven of the categories at all, though this could change with LEED 2012 (which in draft versions for example, addresses integrated design).
• The Living Building Challenge (LBC) has only prerequisites and no optional credits. Fourteen LBC requirements align to some degree with federal requirements, but there are thirteen others that LBC does not address.
While hinting that Green Globes may be preferable to LEED for new construction, the report several times reiterates the importance of measured performance after occupancy and deems LEED for Existing Buildings: Operations & Maintenance (LEED-EBOM) to be the most comprehensive of the three rating systems analyzed for meeting federal requirements.
• Optional credits in Green Globes would help projects meet eight federal requirements for existing buildings. Green Globes does not address six federal requirements at all.
• LEED addresses 27 of the 28 mandates, making it the best match for existing buildings, but performance would have to exceed LEED credit requirements in ten areas in order to meet federal needs. According to the review, LEED does not touch directly on one area of concern, greenhouse gas emissions (although thearguably addresses this).
• Seventeen LBC requirements map with federal priorities, but the system does not address 11.
“Obviously none of the rating systems clearly aligns with the federal mandates, because federal mandates are more extensive and more comprehensive,” said Brad Schaap, P.E., director of sustainability at Leo A. Daly. Schaap characterized the differences among the rating systems as “relatively negligible,” adding that decisions must be made on a project-by-project basis. His firm, which has worked on many federal projects, has used both LEED and Green Globes and found no clear pattern of alignment with legal requirements.
“We use both as a tool,” Shaap told EBN. On a project currently being completed for the Veterans Administration, for example, “for about 20 of the mandates we’re just printing out the LEED documentation, and we have a supplemental narrative where LEED doesn’t go to the extent of the federal mandate.” Green Globes documentation can be used just as easily to demonstrate compliance, he said, meaning that either rating system “saves taxpayer money” by clarifying the scope of work and streamlining the submittal process.
GSA has requiredsince December 2010; the implications of this review remain to be seen. According to Joni Teter, project lead for the rating system review, next steps will include six meetings of an interagency discussion group. Although GSA is focused on federal performance targets, the agency is well aware that it also “has a role in market-shaping,” Teter told EBN, so . The first will take place June 25, 2012, at GSA headquarters in Washington, and the second, which will be a webcast, is slated for July 10. She expects GSA to make a final recommendation in the fall.
Lane Burt, director of technical policy at the U.S. Green Building Council (USGBC), has so far seen no indications that the LEED Gold requirement is likely to change. However, he said, “They are going through the process of re-analyzing, which we fundamentally think they should do.”
Burt emphasized the importance of periodic review and the complexity of the analysis required, adding that “LEED is being developed as a voluntary system for the private sector, so it shouldn’t shock anyone that it’s not a perfect match for federal guiding principles.” However, he continued, “As a whole, the rating system maps quite well with federal guiding principles. It was overwhelmingly positive.”
The big picture
“There is an emphasis in this document on looking at existing building stock,” said Schaap. “Existing buildings are obviously where the focus needs to be for substantial change in a sustainable built environment.” Schaap and many of Leo A. Daly’s federal clients are focused on meeting the 2030 Challenge—targeting carbon neutrality by the year 2030.
“We can’t get there today very easily, but we can continually improve,” Schaap said. “It all goes back to measuring the performance of our designs and learning from what we find. That’s the best way to continue the advancement of sustainable design.”
For more information:
U.S. General Services Administration