LOTUS CERTIFICATION SYSTEM
LOTUS is a set of voluntary green building rating systems developed by Vietnam Green Building Council (VGBC), a project of the non-profit Green Cities Fund, based in California, USA. In Vietnam, VGBC has registered the Vietnam Green Building Social Enterprise Co. Ltd. to manage the LOTUS assessment and training programs.
Similar to LEED (USA), Green Star (Australia) and other established green building rating systems, LOTUS is developed based on established building physics science to evaluate the environmental performance from a whole building perspective, over a building’s life cycle. Since the first LOTUS pilot program was released in 2010, the rating system has undergone several updates and revisions. The latest version is LOTUS New Construction (NC) v3, released in April 2019. LOTUS now cover almost all building types and project scopes, including:
- LOTUS NC v3, for new construction or major renovation project with Gross Floor Area (GFA) from 2500 m2 and above (LOTUS NC v3 is applicable for both residential and non-residential projects)
- LOTUS BIO, for buildings in operation
- LOTUS Homes, for single-dwelling homes
- LOTUS SB, for small non-housing projects, with GFA less than 2500 m2
- LOTUS Interiors, for interiors fit-out projects
- LOTUS Small Interiors, for small interiors fit-out projects (GFA less than 1000 m2)
LOTUS BUILDINGS IN OPERATION
LOTUS BIO assesses any building that has been in operation for more than 18 months and has over 50% occupancy
LOTUS Homes assesses single family dwellings (villas, terraced house or traditional rural house)
LOTUS NC CREDIT CATEGORIES
LOTUS rating system provides a framework for design, construction and operation of buildings from a whole-building perspective and recognize performance in 7 key areas. Points are awarded for achievement of credit requirements in each of these areas. In addition, there are certain prerequisites under each category that the project must meet in order to qualify for consideration of other credits.
This category of credits and prerequisites sets standards for minimum energy efficiency of buildings and encourages the use of various strategies to reduce their overall energy consumption. It also rewards monitoring energy use and supplementing it with on-site renewable energy systems. Up to 32 points can be achieved by implementing various credit requirements in this category.
The increasing use of potable water by buildings has caused a severe drop in the water level in underground aquifers and likely lead to a strain on the country’s water resources, as has already happened in some major urban centers around the world. The credits and prerequisites in this category outline water reduction targets and encourage the use of various strategies, such as using high efficiency fixtures, reusing rainwater, etc. to reduce the amount of potable water used in buildings. It also encourages the use of efficient irrigation and landscape design strategies to reduce the amount of water used for irrigation purposes.
Materials & Resources
This category focuses on reducing the amount of waste that buildings generate during both their construction and operation cycles. It encourages the selection of sustainable materials that incorporate recycled content, are made from rapidly renewable materials, and/or sourced regionally. The category also rewards strategies that reduces the use of concrete or minimizes the need for landfill and incinerator disposal for materials that leave the building.
Health & Comfort
This category focuses on improving the overall indoor environmental quality of buildings. It rewards projects that provide improved ventilation, are designed with occupant thermal and acoustic comfort in mind. It also encourages the use of daylighting and improving access to outdoor views for occupants.
Site & Environment
This category of credits provides guidance on how to select, design and manage project sites. Specifically, it encourages designing regionally appropriate landscape, utilizing best practices for stormwater management. It also rewards smart transportation choices, reduction in light pollution, heat island effect, and construction activity pollution. In essence, these credits try to mitigate some of the negative effects of buildings on the local and regional environment.
This category encourages integrative design, application of BIM, building commissioning and other effective project management practices to deliver high-performance buildings in a cost-effective manner.
This category offers projects a chance to gain extra points in addition to the credit points offered in the above categories. Up to 8 points can be achieved under this category. There are two ways by which these credits can be achieved:
- by demonstrating use of innovative strategies to improve the building’s performance beyond what is required by a LOTUS credit (these are referred to as Enhanced Performance points); or
- by pursuing innovative ideas that are not specifically addressed by any credit in the rating system
LOTUS Certification consists of four levels of certification – Certified, Silver, Gold and Platinum – based on the number of points a project is awarded. There is a varying number of points available for each rating system (including bonus points within the Innovation category). To earn LOTUS Certification, a project must satisfy all prerequisites and achieve a minimum of 40% of the total amount of points (exclusive of bonus points).
IMPACT OF LOTUS-CERTIFIED PROJECTS
21 projects, with a total gross floor area (GFA) of 295,530 m2, have been awarded LOTUS Full Certification by the end of 2018. According to as-built documentation, these projects were projected to save 15,828,757 kWh and 5,700,147 m3 of water each year, compared to baseline (code-compliant) models.
For more information, refer to: LOTUS Market Update.