The LEED for Existing Buildings Rating System helps building owners and operators measure operations, improvements and maintenance on a consistent scale, with the goal of maximizing operational efficiency while minimizing environmental impacts.  LEED for Existing Buildings addresses whole-building cleaning and maintenance issues (including chemical use), recycling programs, exterior maintenance programs, and systems upgrades. It can be applied both to existing buildings seeking LEED certification for the first time and to projects previously certified under LEED for New Construction, Schools, or Core & Shell.

Quick links

Resources

• ACP Documentation Guidance for Projects outside the U.S. (PDF) -- Step-by-step guidance on documenting compliance with the Alternative Compliance Paths (ACPs) for each credit.
• ACP Forms (ZIP) -- These supplemental forms help to document compliance with the ACPs for projects outside the U.S.
• Conversion Tool (XLS) -- Complete all your metric (SI) to imperial (IP) unit conversions for LEED documentation, with one consolidated tool.
• LEED 2009 EB: O+M ACP Survey -- Provide feedback on the ACPs for projects outside the U.S.

• Guidance for Multiple Buildings and On-Campus Projects -- Learn how to more easily and efficiently certify multiple LEED projects located on one site or campus. Note: Until Part 2 of the 2010 AGMBC is released, each individual building or space must be registered and certified separately under a LEED 2009 rating system.
  
• LEED-EB:O&M Reduced Occupancy Guidance (PDF) -- Provides application guidance for credits that are affected by reduced occupancy.
• Policy, Program and Plan Models -- A description of the definitions, requirements, and structure of a policy, program or plan as they relate to LEED-EB:O&M submittals.
• General advancements in LEED 2009 -- Learn about the major enhancements included in LEED 2009.

• SS Credit 4 Update to Approach 1 in Option 3 (PDF) -- This update provides an improved and streamlined methodology for implementing Option 3 (Building Occupant Survey) using Approach 1 (Survey of all Building Occupants). A free calculator (XLS) is also available to assist in using the survey results to assess LEED compliance.  USGBC will formally publish this improvement in an upcoming LEED EB: O&M Reference Guide Addendum, but the new method is approved for immediate use by all LEED EB: O&M customers.

• WE Prerequisite 1 Additional Guidance (PDF) -- Provides guidance for fixture groups, total daily uses calculation, dual flush toilet flow rates, public metering faucet flow rate conversion, and non-potable water use alternative compliance path. (7/15/2011)

• District and Campus Thermal Energy Treatment -- Initial release of guidance for implementing LEED Energy & Atmosphere prerequisites and credits for existing building projects connected to a district or campus thermal energy system.  Includes coverage of both LEED 2009 for Existing Buildings: O&M and LEED for Existing Buildings: O&M 2008.
  
• EA Prerequisite 1 definitions -- Defines Systems Narrative, Building Operating Plan, and Sequence of Operations.
  
• EA Prerequisite 2 / Credit 1 Case 2 Calculator (XLS) -- Use the Case 2 calculator (with the LEED Online form) to document EAp2/c1 for projects not eligible for the ENERGY STAR rating. Includes a Labs21-based benchmarking path for facilities with laboratory space.  

• Space Type Classification (ZIP) -- This spreadsheet categorizes the spaces from IES Lighting Handbook, 10th Edition (ISBN # 978-0-87995-241-9) for applicability to Indoor Environmental Quality credits. These lists should be used along with the definitions provided in the Reference Guide glossary. Exceptions to these classifications will be accepted on a case-by-case basis for spaces with atypical uses or those in which strategies required for compliance may compromise the function of the space. This is not an exhaustive list. If a space is not listed, project teams should try to find a similar space type and follow that guidance. (11/1/2011)
• Daylight Diagrams (PDF) -- Diagrams that support the Toplighting Table in the LEED Online form for IEQc8.1.
  
• IEQ Prerequisite 1 Case 2 Calculator (XLS) -- For project teams using form Version 0.2.3 and prior, use the Case 2 Calculator when the project includes AHUs that don't meet the minimum outside air flows set by ASHRAE 62.1-2007. NOTE: there is an updated version of the IEQp1 form which doesn't require this calculator. Please use the Feedback form in LEED Online if you wish to gain access to the new form.

• Regional Priority Credits -- A listing of the LEED 2009 regional priority credits by United States ZIP code.

Updated 10/5/2011