Can someone please clarify if the entire project (including additions) is used as the "denominator" for this credit? Or only the existing building that is being resused? I am finding the credit language very unclear. Thanks!
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Erika HerreraSustainability Coordinator
MCW Consultants Ltd.
June 15, 2022 - 4:33 pm
I have the same question, if someone has any information, would be great! thanks.
Claudia MezeyConsultant, Built Ecology
12 thumbs up
June 28, 2022 - 6:41 pm
Hi Erica - Great question. My understanding is it depends on whether you're pursuing Option 1/Path 1 or Option 1/Path 2.
For Path 1, my instinct here is to compare to how similar calculations were done under v4. In v4, the BD+C Reference Guide includes sample calculations for Option 3, which is similarly unclear in its descriptive wording around whether the denominator should be the
However, the Futher Explanation-Calculations section of the Reference Guide clears things up. The sample calculations clearly show that the denominator should be only the existing building area eligible for reuse - i.e., without additions. Similarly for v4.1 Option 1/Path 1, the intent of this path closely matches that of v4 Option 3 (although removes non-structural elements from calculation). For this reason, and from the v4.1 credit language "Calculate reuse of the existing project area according to Table 1" - my understanding is that the denominator, as noted above, should be the existing building area.
By contrast, Path 2 requires the denominator to include the total building, both existing and addition, in the denominator.
Allison WilsonSustainability Director
Ayers Saint Gross
4 thumbs up
September 6, 2022 - 12:31 pm
In the old LEED 2009 version of the building reuse credit, there was a limitation on how big the addition could be relative to the existing building reuse in order to use what is now Option 1 under LEEDv4.1. Has anyone run into anything about using Option 1 vs. Option 2 given the relative size of the existing building to be reused and the new addition being proposed?