If you are house-hunting in Bengaluru, you have probably seen the letters IGBC on a hoarding or brochure. Here is what they stand for, and how to think about them when buying your first home.
IGBC in one line
IGBC is the Indian Green Building Council, set up by the Confederation of Indian Industry (CII). It runs rating systems that score buildings on how they use water, energy, materials and land.
It is a choice, not a law
No law forces a builder to get an IGBC rating. A builder applies because it wants an outside view of its green design. That is a good sign. But it is separate from the things the law does require, such as RERA registration and approved building plans. Always check those first.
What a home rating looks at
For housing, IGBC's systems look at broad areas such as:
- how the site is planned and how rain is handled
- how much water the homes and gardens are designed to use
- energy use, such as lighting and common-area power
- materials and waste
- daylight, fresh air and indoor comfort
Projects earn points, and the points decide the level awarded.
Who does the checking
The builder's team prepares the documents. IGBC reviews them. The key point for you: the score comes from IGBC, not from the builder's own marketing.
What a rating tells you
That an outside body has reviewed the green features of the design, or of the finished building, depending on the stage.
What it does not tell you
- It is not a safety certificate.
- It does not promise your electricity or water bill.
- It does not show how well the society will run the systems after handover.
- It says nothing about the legal title of the land.
How to check
Ask the builder for the IGBC letter. Note the project name, the rating system and the stage. Then look for the project on IGBC's website. If the names do not match, ask why.
Rating levels and stages
IGBC ratings come in levels. For its home and residential rating systems, the levels are usually Certified, Silver, Gold and Platinum, from lowest to highest, with some systems also listing a Super Platinum level. The level depends on the points earned. Check the rating system's own document for the exact point bands.
The stage matters as much as the level:
- Pre-certification: given on the design, before or during construction. It shows intent.
- Final certification: given after the building is complete and the features are checked.
A brochure for an under-construction project will usually refer to pre-certification. Ask which stage the claim refers to.
A worked example: what water-saving fittings can mean (illustrative)
Green ratings often reward low-flow taps and showers. These numbers are made up to show the arithmetic.
- A regular shower: 12 litres a minute. A low-flow shower: 8 litres a minute.
- A family of four, 8 minutes of showering each a day.
- Saving per day = 4 × 8 × (12 − 8) = 128 litres.
- Saving per month = 128 × 30 = 3,840 litres.
If a building buys tanker water at an illustrative ₹1,200 for 6,000 litres, that is ₹0.20 a litre. 3,840 litres is worth about ₹768 a month for one family. In a building that depends partly on tankers, savings like this show up in the shared water bill.
A worked example: common-area lighting (illustrative)
Say a building has 200 common-area lights running 12 hours a day. Swapping 20-watt fittings for 10-watt ones saves 200 × 10 W × 12 hours = 24,000 Wh, or 24 kWh a day. Over 30 days, that is 720 kWh. At an illustrative ₹8 per kWh, about ₹5,760 a month off the common power bill, shared by all owners.
Step by step: checking an IGBC claim
- Ask for the IGBC letter or certificate, not a brochure logo.
- Note four things: the project name, the rating system, the level and the stage.
- Look up the project on IGBC's website and match the details.
- Ask which features earned points that affect you directly: water fittings, daylight, ventilation, rainwater harvesting.
- Ask who will run the green systems after handover, and what that costs.
Common mistakes first-time buyers make
- Treating pre-certification as final. Design intent is not the same as a checked, finished building.
- Paying extra just for a label. Ask what the features save you, in numbers.
- Skipping legal checks. A green rating never replaces RERA registration, approvals and title.
- Forgetting operation. A rainwater system that is not maintained saves nothing.
- Mixing up ratings. IGBC, GRIHA and others are different systems. Compare like with like.
Your IGBC checklist
- Certificate or letter seen.
- Rating system, level and stage noted.
- Listing found on IGBC's website.
- Features that matter to my bills listed.
- Plan for running them after handover.
Why green features matter on a first-home budget
A first home comes with two monthly costs: the EMI and the running costs. The EMI is fixed by your loan. Running costs, such as water, power and maintenance, depend partly on how the building was designed. Features like good daylight, cross-ventilation, efficient common-area lighting and rainwater harvesting can lower some of those costs over many years. That is why a green rating is worth understanding, even if it should never be the main reason you choose a home.
Questions to ask the builder
- Which IGBC rating system and level does this project have, and at which stage?
- Can I see the certificate or letter?
- Which features in my flat came from the green design: fittings, windows, ventilation?
- Is there rainwater harvesting, and how much storage does it feed?
- How is waste handled on site?
- Will the association get the manuals and maintenance plan for these systems?
Green features you can check yourself
You do not need a rating to check some things on a site visit. Stand in each room in the day and see whether you need a light on. Feel whether air moves through the flat with windows open. Look at the taps and showers in a sample flat. Ask to see the rainwater harvesting pits or tanks. These simple checks tell you about daily comfort, which is what a green design is meant to deliver.
How IGBC fits with other approvals
Think of a home's papers in layers. At the base are the legal ones: title, approvals, RERA registration and, at the end, the occupancy certificate. On top are voluntary ones, such as a green rating. A voluntary label can add confidence, but it cannot fill a gap in the legal layer. Check the base first, then look at the label. If a project leads with its green rating but is slow to show its approvals, ask for the approvals before anything else.
The short version
IGBC is a voluntary green rating run by an outside body. It is a useful sign of care in design, especially at final certification. It does not replace legal checks, and it does not promise your bills. Check the certificate, the level and the stage, and ask how the green systems will be run after you move in.
A green label is a bonus. For a first home, the basics come first: title, approvals, RERA and an EMI you can carry. Our first-home guide lists them in order.