Re-certification of Green Mark Buildings“Re-certification of Green Mark Buildings” is a process for qualified Green Mark-certified buildings tobe recognised for sustained performance in the area of energy and water efficiency, operations andmanagement, and indoor environment quality. By satisfying a checklist of performance metrics, suchbuildings can be re-certified to its most recent Green Mark scheme and rating.Prospective buildings will find this process more user friendly and of greater value with the option touse the BCA’s smart chiller efficiency portal – a dynamic tool that continually testify that its coolingsystem performs efficiently.Eligibility1. The building has not been retrofitted since its last Green Mark assessment2. It intends to retain the same Green Mark scheme and rating3. It was certified with the following schemes:a. Green Mark for New Non-residential Buildings (GM-NRB)b. Green Mark for Existing Non-residential Buildings (GM-ENRB)c. Green Mark for Healthcare Facilities (GM-HC)Assessment Process“GM Recertified” process provides a framework of requirements enabling Green Mark certifiedbuildings to: data to better understand and make decisions concerning energy and water useDevelop a policy for more efficient use of resourcesSet targets and objectives to meet the policyMonitor and measure the resultsReview the effectiveness of the policyAccount for its waste footprint and recyclingContinually meet occupants’ satisfactionWhile it resembles some aspects of a management system, it should not be seen as a substitute orequivalence of the latter.Sep 2017Pg 1/5

Referring to the above diagram, building performance metrics and policy statements are submittedin a prescribed spreadsheet comprising worksheets to facilitate data entry and documentattachment:1. Building information such as Green Mark application details, GFA, cooling load2. Energy audit report for the cooling system by an BCA-accredited Energy Auditor orProfessional Mechanical Engineer3. Temperature readings from the chiller measurement and verification (M&V) instrumentation(to be filled in by the assessor, not applicable to early versions of Green Mark)4. 3-year energy and water use5. Energy and water improvement plan6. Cycle of concentration of cooling tower water, derived from a water analysis report7. Occupant satisfaction survey (see “Annex B: POE Questionnaire for Indoor EnvironmentSurvey” of GM ENRB:2017)8. Corporate environmental and recycling policy9. Indoor Air Quality (IAQ) audit report by an accredited firm, and noise and light levels in variousareas of the buildingThe spreadsheet template to facilitate the submission of the above is available on the BCA website.This will be followed by an on-site verification of the temperature sensors used for chiller M&V; andvisual inspection of key installations and equipment such as AHU, filters, M&V instrumentations,cooling towers, waste management, building automation system and water and electrical submeters. Attention will also be paid to symptoms of indoor environmental quality issues such asmoisture and condensation, thermal comfort, indoor pollutant control etc.The assessment will be based on the checklist as described above. There will not be any point scoringfor the recertification assessment. Projects previously certified to GoldPLUS and Platinum, and wish toSep 2017Pg 2/5

retain the same rating under the recertification process do not have to go through the Boardpresentation.AwardSuccessful applicant will be awarded the Green Mark certificate with its previous GM scheme andrating, next to which is the word “Re-Certified” to publicly acknowledge the building’s continuedperformance and commitment. Legacy versions of Green Mark, i.e. GM-NRB v1 & 2 and GM-ENRBv1, will be re-certified as GM-ENRB v2.1.Sep 2017Pg 3/5

FAQ about the Re-certification Process1) My building’s Green Mark certificate has lapsed. Is the building still eligible to use this process torenew its Green Mark certification?Yes, if it meets the eligibility criteria.2) My building was certified as a Green Mark for New Non-residential Building v4.1 (GM-NRB v4.1Gold) in 2012. Can I used this process to re-certify it to Green Mark for Existing Non-residentialBuilding v3 (GM-ENRB v3 Gold)?No, this process may not be used to “port” a building across GM schemes. Your building will bere-certified to GM-NRB v4.1.3) My building is still subject to verification for New Development / committed features. Is it stilleligible for this process?The building should have been verified or in its final stage of verification. Discuss with yourassigned assessor to work out an action plan.4) How do I apply for my building to use this process?You may do so online at as you would with all otherGreen Mark application.5) Where may I download a copy of the submission templates?They are available from mark criteria.html6) What are the efficiency pre-requisites for the chiller plant?The chiller plant efficiency benchmark is as required in the respective Green Mark scheme andrating that the building will be re-certified to, e.g. for a GM-ENRB v3 Platinum building, its plantefficiency should not exceed 0.65 kW/Rt.7) Earlier versions of Green Mark did not have chiller plant efficiency pre-requisite. Must a buildingscertified with one of these versions meet a minimum efficiency for its chiller plant?Yes, the minimum efficiency is 0.9 kW/RT, pegged to that required in GM-ENRB v2.1. Earlierversions of Green Mark that did not stipulate a minimum plant efficiency are NRB v1, 2 & 3, andENRB v1.And to retain GoldPLUS or Platinum rating, buildings certified with these versions must also meetthe corresponding minimum efficiency in GM-ENRB 2.1 for these ratings at 0.75 and 0.70 kW/RTrespectively.8) The building’s chiller plant is not equipped with permanent M&V instruments. How shall itsefficiency be determined?A plant energy audit report by a BCA-registered Energy Auditor or a professional MechanicalEngineer is required. This entails using temporary instruments to trend the plant’s performancefor a period of one or more weeks.Sep 2017Pg 4/5

9) My building’s energy/water consumption has increased by more than 5% in recent years. Howare such deviation evaluated?A building’s energy or water consumption may increase for various reasons such as change ofuse in certain areas or a new tenant’s operation. Discuss with your assigned assessor to accountfor these causes.10) Will the re-certified building be awarded a Green Mark certificate? And how long will it be validfor?Yes, and it is valid for 3 years from the date of Letter of Award.Sep 2017Pg 5/5

Re-certification of Green Mark Buildings “Re-certification of Green Mark Buildings” is a process for qualified Green Mark-certified buildings to be recognised for sustained performance in the area of energy and water efficiency, operations and management, and indoor environment qualit