The Two Main Rating Systems
India has two green building rating systems that matter in practice. IGBC (Indian Green Building Council) is the more widely used, adapted from the US LEED framework but calibrated for Indian climate and materials. GRIHA (Green Rating for Integrated Habitat Assessment) was developed domestically by TERI and is mandated for all Central Government buildings above 500 sqm. Both evaluate buildings across energy efficiency, water efficiency, material use, site ecology, and occupant health. A project can pursue either; some pursue both.
For a contractor, the important distinction is this: rating system requirements are not aspirational — they have measurable, documentable thresholds. A GRIHA One Star building must demonstrate 25% reduction in energy consumption compared to a baseline. A Five Star building must demonstrate 50% or more. Each credit has a defined measurement methodology and a required body of evidence. This is not a vibe — it is documented compliance.
What Gets Checked on Site
Contractors are responsible for a significant share of the documentable evidence. Material sourcing records — specifically whether materials were procured within 400 km of the project site (a credit in both systems) — need to be kept from the start. Cement, steel, and aggregates purchased locally contribute to 'regional materials' credits. Fly ash content in cement or brick is separately documented. Construction waste management — how much went to landfill versus was recycled or reused — needs to be tracked.
During execution, water used on site, dust suppression methods, storage of hazardous materials (paints, solvents), and erosion control at the site boundary are all auditable. The auditor will visit the site during construction, not just at completion. A contractor who is disorganised about documentation will create problems for the project's rating even if the building itself is well-built.
The Cost Reality
A common objection is that green buildings cost more. The data is more nuanced. IGBC certification of a standard commercial building adds 1–4% to construction cost depending on the star level targeted. For a building designed with energy efficiency in mind from the start — good orientation, shading, and insulation — the cost premium drops to near zero. The premium is higher when green measures are retrofitted onto a design that was not conceived with them in mind.
For contractors, the incremental cost is largely in documentation, a few specified materials (LED fixtures, dual-flush fittings, low-VOC paints), and the time of a green building consultant. The consultant cost for a mid-size project is ₹8–15 lakh. On a ₹20 crore project, this is less than 1% of project cost and is typically client-paid.
Practical Steps for Contractors
If you are working on a rated project, appoint one person on your team — a senior supervisor or site engineer — as the green documentation coordinator. This person's job is to collect material invoices, photograph construction waste disposal, and maintain the evidence register. Do not try to reconstruct this documentation at the end of the project — it is nearly impossible. IGBC and GRIHA both have online portals where evidence is submitted credit by credit; your consultant will guide you through what is needed.
If your clients have not yet asked for green ratings, start asking whether they are interested. Government clients are increasingly required to pursue ratings. Private commercial clients in office and retail are aware that rated buildings command higher rents and have better valuations. Being the contractor who can credibly promise rated delivery is a differentiator in the market.