A comparison of building rating systems

Green Globes is an online green building rating and certification tool that is used primarily in Canada and the USA.

A comparison of building rating systems

The release included the design and construction portions of the the rating system suite which includes rating systems for buildings, villas, and neighborhoods. The decision to learn from these rating systems was not only to learn from their mistakes but also to help create a system whose requirements are familiar to the market.

On the other hand, the Estidama program asserted that the A comparison of building rating systems Rating System would not be a direct copy of either systems given the environmental and cultural differences of the Emirates Given the debates that exist amongst practitioners and researchers on both sides of the Atlantic on the merits, shortcomings, and differences between BREEAM and LEED.

An Introduction To understand the differences between the three systems one must first understand their background and history.

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The Pearls Rating system is a government initiative developed by the Abu Dhabi Urban Planning Authority and has just been launched in LEED is a registered trade mark and a brand name.

The Pearls Rating System is also strongly linked to the Estidama Integrative Design Process EIDPwhich seeks to promote the new concept of Integrated Design process IDP as a design approach amongst design professional by encouraging design coordination at the early stages of the project.

These analyses include solar and contextual analyses, Energy efficiency design strategies including preliminary energy modeling, water budgeting, simple material strategies, and an analysis of potential for habitat connectivity.

These broad goals are tied to Estidama through a number of key performance indicators measuring energy use, water use, waste generation, carbon footprint, and biodiversity amongst others indicators.

Pearls and the Building Code The second striking difference between the Pearls Rating System referred to as Pearls henceforth is its integration into the Abu Dhabi development codes.

Pearls includes requirements to comply with these new development codes which are mandatory requirements for a development to get planning and building permits.

Such an integration would be more challenging in established and complex code environments such as those of the UK or the US.

A comparison of building rating systems

Credits and Requirements As noted above, Pearls includes a number of code requirements which have been rewritten specifically for Pearls, and the satisfaction of these code requirements awards a project the lowest Pearls rating of One Pearl.

Points are added up to a final rating which ranges from One Pearl to Five Pearls. The highest rating of Five Pearls requires a restorative, or a net positive, contribution to the environment in terms of energy, water, and improving diversity and health of living systems.

Such requirements are much like — if not more challenging than- the progressive Living Building Challenge developed by the Cascadia Green Building Council. This relative importance is understood differently between different rating system. For example, LEED is strong on occupant comfort, internal pollution issues off-gassing etcand heat island effects.

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LEED is also geared towards climates which use mechanical ventilation and air conditioning and where existing infrastructure promotes the use of cars as is the case in much of the United States whereas BREEAM responds to a built environment where natural ventilation is more prevalent and where a strong public transportation infrastructure exists.

BREEAM on the other hand is strong on pedestrian and cyclist safety, with much higher targets for cyclist spaces. It is also stronger than LEED on the social aspects of sustainability, and on acoustics. This emphasis is understandable given that the Emirates ranks third in the world in terms of the volume of sea water desalinated daily, at 4.

Pearls also puts more emphasis on materials and Indoor Environmental Quality. Rating systems comparison table. The table is for general comparison purposes only as it does not take into account point-less prerequisites.

The names of some categories have been adjusted and some credits have been moved across categories to simplify the comparison. This assessment method is very different from the web-based LEED Online system which reduces interaction and dialogue between building professionals and the USGBC to a minimum mostly through online submissions of Credit Interpretation Requests.

To compensate for this, the United States Green Building Council has chosen to encourage building professionals to obtain training on how to use LEED and to become accredited professionals in the use of the rating system.

Pearls hybrid approach is much like BREEAM, in relying on a dedicated competent assessor for each project in its attempts to emphasize dialogue and an iterative design process. However, taken into consideration that the actual certification only takes place after a post-occupancy assessment, it appears that Pearls would be much more onerous than LEED since any alternative compliance path adopted by the designers must be demonstrated to work after occupancy, which is not the case with LEED.

The first stage is during the design and construction phases. A Pearls Design Rating can be used to confirm that the proposed project design is consistent with the goals of Estidama.

Once construction is complete as designed, a Pearls Construction Rating, will be provided. While these design and construction rating certificates can be used for marketing purposes, they must state that the rating advertised is a Design Rating or a Construction Rating and must not be used beyond their respective stages.

As such, the construction rating does not constitute the final Pearls certificate.

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The post-construction assessment, is designed to validate the Pearls Construction Rating, but it also has the powers to reduce or increase the rating. Previous draft publications from Estidama have indicated that the final certificate for Pearls Operational Rating was mandatory for the rating to be complete, however, since Operational portion of the rating systems has not yet been released, this is yet to be confirmed.

Estidama appears to have picked certain elements from these two systems amongst other sources of inspiration, but still developed a system that is quite progressive and distinctly local.

The degree to which market will embrace a system with such a high bar is yet to be determined as project teams engage with the system. He can be contacted at:The concept of sustainable building incorporates and integrates a variety of strategies during the design, construction and operation of building projects.

The use of green building materials and products represents one important strategy in the design of a building. rating systems around the world, which HDR is asked about most frequently.

It does not include all rating High-Level Comparison BOMA PERFORMANCE PROGRAM BREEAM (v2) EDGE ENERGY STAR ESTIDAMA PEARL Description Rating system .

Various green rating systems are established globally to evaluate the sustainability of construction projects. Their categories and criteria have been under constant updates to follow the sustainable trend of building development.

GREEN BUILDING RATING SYSTEMS A COMPARISON OF THE LEED AND GREEN GLOBES SYSTEMS IN THE US Prepared For: The Western Council of Industrial Workers. information about the world’s most widely used green building rating systems and how they incorporate and reflect wood and wood products. The intention is rating systems, there follows a comparison of two theoretical project scenarios the first with as much wood in .

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