IGBC, LEED, GRIHA and EDGE: Four Systems, Four Owners

Four acronyms circulate in Indian residential marketing, and buyers reasonably assume they are four brands of the same thing, the way Bosch and Siemens are two brands of dishwasher. They are not. They have different owners, different countries of origin, different treatments of water and climate, and different ideas about what a green building is for.

Here is what separates them, and what a homebuyer can actually do with the difference.

Who owns each system

Two of the four are Indian institutions and two are not, and that shows up everywhere in how they are written.

What each one weights most heavily

IGBC scores a residential project across families of credits covering site planning, water conservation, energy efficiency, materials and waste, and indoor environmental quality, with mandatory requirements inside each family and optional credits above them. Water carries real weight, which is what you would expect of a system written in a country where a city's supply can be the constraint on whether it grows.

LEED is structured similarly in principle — prerequisites and credits, added to a total, mapped to levels — but its centre of gravity historically sits on energy performance and on documented, modelled outcomes. It is the system an international investor or a multinational occupier is most likely to name by default.

GRIHA is the most process-oriented of the four. It puts unusual weight on the construction phase itself — site management, worker welfare and safety, waste on site — and on things assessed by evaluation and site visit rather than by document alone. If your concern is how a building was made and not only how it performs, that emphasis is the differentiator.

EDGE is deliberately the narrowest. It is not a broad credit catalogue at all: it measures three resource streams — energy, water, and the energy embodied in materials — against a modelled base case for the same building type in the same location, and awards certification when the design clears the system's published reduction thresholds in all three. Fewer questions, answered numerically.

How each treats Indian climate and water

This is where the origin of a system stops being trivia.

India spans several climate zones, and a strategy that is correct in one is wrong in another: the glazing and shading logic for a warm-humid coastal city is not the logic for a composite or hot-dry one. IGBC and GRIHA are written from inside that problem and reference Indian climatic classification and Indian codes directly. EDGE handles it by modelling a local base case, so its comparison is intrinsically local even though the system is not. LEED addresses climate through its own regional frameworks, which work, but which were designed around a different building stock.

Water is the sharper divide. In an Indian city, water is frequently the binding constraint on a residential community — tanker dependence, groundwater depletion, treatment and reuse. The Indian systems treat water conservation and reuse as a first-class family of credits. A rating written for a market where municipal supply is assumed will not weight it the same way, and for a Bengaluru buyer that weighting is not an academic point.

Residential scope: which one is even about your home

Not every system has a homes-specific rating, and this is the trap that catches buyers most often. A developer may hold a rating under a system's commercial or large-development rating rather than its residential one, and the announcement will simply say the acronym.

IGBC publishes residential rating systems, including ones aimed specifically at homes and at residential societies. GRIHA has residential variants alongside its main system. LEED has a homes rating alongside its building-design systems. EDGE covers homes among its building types. The question to ask is not "are you rated?" but "under which rating system, and is it the residential one?"

Design stage versus operational assessment

All four distinguish, in one way or another, between an assessment of a design and an assessment of something built or operating. IGBC awards a design-stage pre-certification and a final certification after completion. LEED separates design and construction from performance in operation through different rating systems. GRIHA's evaluation runs through the construction phase and into completion. EDGE separates a preliminary design-stage outcome from a post-construction certification against what was actually built.

Whatever the labels, the buyer's question is identical in all four cases: which one is this letter? A design assessment is a genuine third-party review of a set of intentions. It is not a statement about a finished building, and no system pretends otherwise — only marketing does.

Levels, stars and thresholds

The scales differ in kind, not only in name. IGBC and LEED both use a points total mapped to named rungs, with Platinum at the top of each. GRIHA rates in stars. EDGE is threshold-based rather than graduated in the same way, with certification awarded when the modelled reductions clear the published bar, and further recognition above that for deeper performance.

A level is awarded, and it is awarded at a specific stage. This is why a level printed in an advertisement is not, by itself, evidence of anything: it is a number that either came off a letter or came out of a design meeting, and the advertisement does not tell you which.

What none of them is

None of the four is a statutory permission. A project still needs its planning and building approvals, its water and sanitation connections, its consents for a treatment plant from the state pollution control board, and its sanctioned electrical load — none of which any council issues or waives.

It is also worth knowing that India has a code-based track running in parallel to the voluntary rating track: the Bureau of Energy Efficiency publishes an energy conservation code for buildings, with a residential code alongside it. A code sets a floor by rule; a rating system offers a ladder by choice. Confusing the two is common, and it flatters the rating.

Which directory to check, and what a directory entry proves

Each body publishes its own listing of registered and rated projects, and that listing — not the developer's website — is the check. IGBC's is on igbc.in. The LEED and GBCI project directories are searchable online. GRIHA publishes its rated projects. EDGE lists certified projects through the programme's own site.

Three cautions about directories, learned the hard way by anyone who has run this check.

• Search the applicant, not the brand. The entity that applied is often the registered legal promoter, and the name on the hoarding may be a trading brand. If the two do not match, that is a question, not necessarily a problem.
• A directory entry records a status, not a quality. "Registered" means an application exists. It does not mean an award was made.
• Absence is not proof of absence. Directories lag. A recently issued award may not be listed yet — which is exactly why you ask for the letter as well.

So what should a buyer actually do

Stop ranking the acronyms and start reading the sentence. Establish which body issued it, which of that body's rating systems applies, what stage the award describes, and whether the project appears under a name you can reconcile. Then take the features the rating is resting on and find out which of them appear in the specification annexure to your agreement, because that is the only part of any of this you can enforce.

The vocabulary — pre-certification, alignment, rating system, level — is defined in the glossary, and where SUYUG stands on each of these words, project by project, is set out on our sustainability page.