Environmental Impact Assessment (EIA) in India: Process, Steps and Clearance
Quick answer: An environmental impact assessment studies how a proposed project will affect the environment before it's approved. In India, projects listed under the EIA
Notification, 2006 need prior environmental clearance through a four-stage process: screening, scoping, public consultation and appraisal, filed through the PARIVESH portal.
Table Of Contents
Key takeaways
An EIA happens before a project starts. It's different from an environmental audit, which checks an operating site after the fact.
Projects fall into Category A (cleared centrally) or Category B (cleared by the state), and B splits further into B1 and B2.
The clearance process has up to four stages, and not every project goes through all of them.
In July 2026, the Supreme Court closed the routine route for getting clearance after construction had already begun. Prior clearance is now enforced more strictly than before.
Skipping clearance isn't just a paperwork risk. It can mean criminal liability and penalties running into crores of rupees.
Introduction
Planning a new factory, expanding a hotel, or developing a real estate project? At some point, you may hear someone say, “You’ll need an EIA before you start.” If you’re wondering what that means for your project, you’re not alone.
An Environmental Impact Assessment (EIA) helps identify how a proposed project could affect the environment before major decisions are made. For projects covered by India’s environmental clearance rules, it can be a crucial step between having a plan and getting the go-ahead.
And there’s an important legal update to know about. In July 2026, the Supreme Court reinforced that prior environmental clearance is mandatory where required by law. It also struck down the Centre’s 2021 office memorandum that had allowed certain projects to seek clearance after work had begun. In short, starting first and sorting out the paperwork later is a risky approach.
So, who needs an EIA, how are projects classified, what does the clearance process involve, and how long can it take? Let’s break it down, including the latest legal position, the documents you may need, and the consequences of starting a project without the required clearance.
What is an environmental impact assessment?
An environmental impact assessment studies how a proposed project is likely to affect the environment, air, water, land, biodiversity, and the people living nearby, before that project is approved. It's a forward-looking study, not a check on something already built.
"Environmental clearance" is the approval that comes out the other end, once the assessment and the government's review process are complete. So the two terms are related but not interchangeable: the EIA is the study, the clearance is the outcome.
India's first EIA notification came in 1994. The EIA Notification, 2006 replaced it and is still the framework that governs clearance today. A draft EIA Notification, 2020 proposed sweeping changes, but as far as we could find, it remains a draft, so the 2006 notification and its amendments are still what applies.
This is also where an EIA differs from an environmental audit. An EIA looks ahead, before ground is broken. An audit reviews a site that's already operating, checking whether it's actually following the commitments made in its clearance.
Who needs environmental clearance?
Not every project does. The Schedule to the EIA Notification, 2006 lists the specific project types and sizes that require prior clearance, covering sectors like mining, thermal power, large-scale industry, infrastructure, ports, and building or construction projects above certain thresholds.
The exact size thresholds get amended from time to time, so rather than quoting numbers that might be out of date by the time you read this, check your project against the current Schedule directly, or get a consultant to confirm your category.
One thing worth knowing: if your project isn't listed in the Schedule, you generally don't need prior clearance under this notification. But you may still need other approvals, such as Consent to Establish or Consent to Operate from your state board, forest clearance, or CRZ clearance if you're near the coast.
Project categories: A, B1 and B2
Every project that needs clearance gets sorted into one of these categories, and the category decides who reviews it and how much is required.
Category A | Category B1 | Category B2 | |
Who appraises it | Central Expert Appraisal Committee, cleared by MoEFCC | State Expert Appraisal Committee, cleared by SEIAA | State Expert Appraisal Committee, cleared by SEIAA |
Screening stage | Not applicable | Applies (decides B1 or B2) | Applies (decides B1 or B2) |
Full EIA report required | Yes | Yes | No |
Public consultation required | Yes, with narrow exemptions | Yes, with narrow exemptions | No |
Typical examples | Larger mining, thermal power, major infrastructure | Mid-sized industrial or infrastructure projects | Smaller projects with limited impact |
Category A covers the higher-impact projects and goes straight to the centre. Category B goes to your State Environment Impact Assessment Authority, based on what the State Expert Appraisal Committee recommends. Within Category B, B1 needs the full EIA study and a public hearing. B2 doesn't, once it clears screening.
The environmental clearance process, step by step
The process runs through up to four stages, though Category A projects skip the first one.
Stage 1: Screening (Category B only). The State Expert Appraisal Committee reviews your Form 1 application and decides whether your project is B1 or B2. If you're Category A, you move straight to scoping.
Stage 2: Scoping. The Expert Appraisal Committee (for Category A) or the State committee (for B1) sets the Terms of Reference for your EIA study, based on your Form 1 and the supplementary Form 1A. This stage matters more than it sounds. Get the scope wrong here, and you'll be redoing work later.
Stage 3: Public consultation. Required for Category A and B1 projects, with a few narrow exemptions, including certain defence-related projects. It has two parts: a public hearing near the project site, and written responses from anyone affected who couldn't attend.
Stage 4: Appraisal. The committee reviews your final EIA report, your Environmental Management Plan, and everything that came out of the public consultation, then recommends whether clearance should be granted or refused.
Everything runs through the PARIVESH portal now. Physical, paper applications generally aren't accepted.
One honest note: timelines genuinely vary by category and by how complete your application is the first time round. Treat any single average figure you read online as a rough guide, not a promise.
How long does it take, and how long does clearance last?
This is usually the question that actually matters for planning.
On timing, the government's PARIVESH 2.0 push has been credited with cutting average processing time for some approvals, though the real number for your project depends heavily on its category and how complete your application is. Don't bank a construction schedule on an average you read in a news article.
On validity, the period your clearance is good for depends on your project type, and this is an area that's actively being amended. As one example, in September 2026 the government extended the validity period for ports, harbours, breakwater and dredging projects to 20 years, with further extensions possible. Other sectors have their own validity periods, generally running somewhere in the range of several years to a couple of decades depending on the project. Because these figures get revised, check the current notification for your specific sector rather than relying on a number that might already be out of date.
Clearance can usually be extended before it expires, and in some cases transferred to a new owner through PARIVESH, but only within the original project's scope and terms.
What changed in 2026: the Supreme Court closes a door
This is the part of the story most guides to EIA in India are missing right now, and it's worth understanding properly.
For years, a 2021 government Office Memorandum let some projects get environmental clearance after they'd already started construction or operations, a process called "ex post facto" or "post-facto" clearance. In practice, this gave some developers a quiet safety net: start building, sort the paperwork out later if anyone asked.
On 29 July 2026, a three-judge Supreme Court bench struck that memorandum down. The Court held that prior environmental clearance remains the rule, and that the government can't use a standing administrative order to routinely regularise projects that skipped it. A narrow, time-bound amnesty, created through a proper notification rather than an open-ended office memo, may still be used in genuinely exceptional public-interest cases. But routine regularisation through an administrative circular is no longer allowed.
This came after a fair bit of back and forth. A May 2025 ruling called such clearances "a gross illegality." A November 2025 larger bench recalled that decision, worried about the knock-on effect on large public projects already under way. The July 2026 judgment reviewed all of that and landed back on the stricter position: get your clearance first.
Clearances already granted under the old memorandum remain valid unless someone individually challenges them. But for any project starting now, the message is straightforward: the safety net is gone. Starting construction before clearance comes through is a genuinely riskier bet than it might have seemed a year ago.
What happens if you skip environmental clearance
We don't say this to be alarming, just honest, because understanding the real cost helps make the case for doing this properly, early.
The Environment (Protection) Act, 1986 provides for imprisonment and fines for contravening its provisions, with the penalties escalating the longer a violation continues. (Amendments have been proposed over the years to shift some of these penalties from criminal liability to monetary ones, so check the current position before relying on specific figures.)
Beyond the Act itself, the National Green Tribunal has repeatedly imposed large environmental compensation payments on projects that started without clearance. In one widely cited case, the Tribunal ordered a group of Tamil Nadu builders to pay around Rs 76 crore after they began construction without environmental clearance. In another, it fined a Delhi hospital trust Rs 15 crore, calculated at 5% of the project's value, for construction that had already progressed before clearance was sought.
And practically speaking, a Consent to Operate generally can't be granted without environmental clearance where clearance is required in the first place, so skipping the EIA step doesn't just risk a fine. It can stall the whole project.
Common challenges, and how to handle them
A few things trip projects up again and again:
Incomplete Form 1 applications. Missing or vague details at the start slow down screening and scoping.
Unclear categorisation. Getting your Category A/B1/B2 status wrong early costs time later.
Public hearing logistics. These need real lead time to organise properly, not a last-minute afterthought.
Gaps between the EIA report and what actually gets built. If construction drifts from what was modelled, that's exactly the kind of gap an environmental audit later catches.
The realistic fix for most of this is simple: bring in an environmental consultant early, while the project is still being designed, not after the design is locked in. Scoping decisions made at the start shape what the rest of the process demands.
Where to get the right kind of help
It's worth knowing that "environmental consultant" and "sustainability consultant" aren't quite the same thing, and the distinction matters when you're choosing who to work with. An environmental consultant typically handles EIAs, Consent to Establish and Consent to Operate applications, the kind of clearance work this article has been about. A sustainability or ESG consultant focuses more on frameworks like BRSR, GRI, and investor-facing disclosures, the ESG side explained in Greenmyna's guide to what ESG actually stands for.
If you're weighing whether to build this expertise in-house or hire it in, how to start an environmental consulting firm walks through what the field actually looks like in India right now, useful reading even if starting a firm isn't your goal, just to understand who you're hiring.
The bottom line
An EIA exists to catch problems before they're built into the ground, literally. The process has clear, well-defined stages, but 2026 raised the stakes for getting it right the first time: the easy route to fixing things after the fact has narrowed considerably. Start early, get your categorisation right, and don't treat scoping as a formality.
Talk to our team about environmental compliance and sustainability consulting, and we'll help you figure out exactly what your project needs.
FAQs
1. What's the difference between an EIA and an environmental audit?
An EIA looks ahead, assessing a project before it starts. An audit reviews a site that's already up and running, checking whether it's actually doing what its clearance said it would.
2. How long does environmental clearance take in India?
It depends heavily on your category and how complete your application is. Government figures point to meaningful improvements in average processing time through the PARIVESH portal, but treat any single number as a rough guide rather than a guarantee for your specific project.
3. Can a project get clearance after construction has already started?
Not routinely, not anymore. Since the Supreme Court's July 2026 ruling, the open-ended administrative route for post-facto clearance has been closed. A narrow, time-bound amnesty may still apply in genuinely exceptional public-interest cases, but it's no longer something a project can casually rely on.
4. Do all projects need environmental clearance?
No. Only the project types and sizes listed in the Schedule to the EIA Notification, 2006 need prior clearance under this specific framework. Smaller or unlisted projects may still need other approvals, just not this one.
5. What's the penalty for building without environmental clearance?
It can mean criminal liability under the Environment (Protection) Act, 1986, and separately, the National Green Tribunal has ordered environmental compensation running into tens of crores of rupees in past cases involving construction started without clearance. The exact figures depend on the case and the current state of the law, so this isn't something to estimate casually.
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