The Building Reuse calculator (see the Documentation Toolkit) helps in tabulating and obtaining a reuse percentage for credit targets. This data can be transferred to LEED Online after being finalized. Use these guidelines in carrying out the calculations for Building Reuse.
- Include the following in the calculations as “existing elements”: the surface area of one side of all structural floors, roof decks, exterior walls, and party walls. Count the reused portions of these in “reused elements.”
- In all calculations, count and include the surface area of one side of interior structural walls, for example an elevator shaft support wall in middle of a building.
- Exclude the following from all calculations for this credit: hazardous materials, envelope materials that are structurally unsound, roof finish materials, window assemblies, and doors.
- Exclude surface areas of structural supports like columns and beams from all the calculations, existing or reused. Larger wall and roof areas supported by columns and beams are included, so these structural members are excluded to avoid double counting.
- See the Documentation Toolkit for an example of how to calculate the surface area of existing structure elements.
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