Promoting Green Buildings: India’s Push Towards Energy Efficiency

Buildings are quiet but enormous consumers of energy. In India, the building sector accounts for over 30% of the total electricity consumed annually and is among the largest emitters of greenhouse gases. As cities expand and construction booms, the way we design and run our buildings has become central to the country’s energy and climate goals. This is exactly why the government has built a layered system of codes, clearances, and rating systems to push construction toward energy efficiency. Understanding how these pieces fit together gives you a clear picture of how “green buildings” move from an idea to a regulated, measurable reality.

Why green buildings matter for India’s energy story 🔗

The construction and real estate sector contributes a significant share of India’s GDP and has been growing far faster than the global average. That growth is welcome, but it comes with a cost. More buildings mean more demand for cooling, lighting, water heating, and electricity overall. Electricity consumption in residential buildings rose from about 55 TWh in 1996-97 to roughly 260 TWh by 2016-17 – more than a fourfold jump in two decades.

A green building is designed and operated to reduce this consumption while keeping occupants comfortable and healthy. The idea is not to make buildings austere but to make them efficient: better insulation, smarter lighting, natural ventilation, renewable energy, and responsible use of water and materials. The government’s response to rising building energy demand works on three connected fronts – design codes, environmental clearances, and voluntary rating systems.

National Building Code and ECBC 🔗

The first front is the rulebook for how buildings should be designed and constructed. Two documents anchor this in India.

The National Building Code of India 🔗

The National Building Code (NBC) is the national instrument that lays down guidelines for regulating building construction activities across the country. Its most relevant section here is Part 11, which defines an approach to sustainability focused on energy efficiency and other environment-compatible norms. The NBC covers structural safety, fire protection, plumbing, and much more, but Part 11 is what ties everyday construction practice to sustainable design. It is the broad framework within which more specific energy codes operate.

The Energy Conservation Building Code 🔗

The Energy Conservation Building Code (ECBC) is the more targeted tool. The Bureau of Energy Efficiency (BEE) developed the ECBC for new commercial buildings and released it in May 2007, drawing its legal backing from the Energy Conservation Act, 2001. The code sets minimum energy performance standards for commercial buildings. It applies to buildings or building complexes with a connected load of 100 kW or greater, or a contract demand of 120 kVA or greater.

The ECBC sets requirements across the components that drive a building’s energy use. It outlines guidelines for the building envelope, HVAC (heating, ventilation, and air conditioning), service water heating, interior and exterior lighting, electrical power and motors, and renewable energy systems. In 2017, an updated version was launched. ECBC 2017 made provisions for renewable energy generation systems mandatory and required passive design strategies like daylighting and shading.

To measure how well a building actually performs, the code uses a metric called the Energy Performance Index (EPI). The EPI is the ratio of a building’s annual energy consumption in kWh to its total built-up area, so a lower EPI signals a more efficient building. Savings are estimated by comparing a conventional building’s EPI with the proposed efficient design.

How the code is adopted across states 🔗

Here is an important structural point. Buildings fall under the State List of Schedule 7 of the Constitution, so adopting and implementing these codes is the responsibility of state governments and their urban local bodies. The central government sets the model code, but states have the flexibility to modify it to suit local or regional conditions and then notify it. This is why ECBC adoption has been uneven, with several states making it mandatory through their gazette notifications while others remain in earlier stages.

Extending the code to homes 🔗

Since most building energy in the residential sector comes from homes, the government extended this approach to housing. The Ministry of Power and BEE released the Eco-Niwas Samhita (ENS) in 2018, the energy conservation code for residential buildings. Its first part focuses on the building envelope – walls, roof, and windows – to limit unwanted heat gain or loss and to ensure adequate natural ventilation and daylight. A second part, launched in 2021, covers energy efficiency in building services, indoor electrical end uses, and on-site renewable energy systems. A notable shift came with the Energy Conservation (Amendment) Act, 2022, which made the Eco-Niwas Samhita mandatory and set out the transition of ECBC into a broader Energy Conservation and Sustainability Building Code covering embodied carbon, net-zero emissions, and material efficiency.

Environmental Impact Assessment 🔗

The second front is the gatekeeping mechanism. Before a large building can be constructed, its likely environmental effects must be studied and cleared.

What EIA does 🔗

An Environmental Impact Assessment (EIA) systematically examines both the positive and negative effects of a proposed project so that these are accounted for during design itself, rather than discovered after damage is done. The legal foundation is the EIA Notification, 2006, issued under the Environment (Protection) Act, 1986, which requires prior environmental clearance for listed new projects, expansions, or modernizations before they can be undertaken anywhere in India.

The notification sorts projects into two categories. Category A and Category B are distinguished by the scale of environmental impact, with Category A appraised at the central level and Category B handled by the State Environment Impact Assessment Authority (SEIAA). The overall process moves through stages: screening, scoping, public consultation, and appraisal.

How EIA applies to buildings 🔗

Building construction projects appear in the notification’s schedule under item 8(a). For decades, the trigger threshold was clear: building and construction projects, area development projects, and townships with a built-up area of more than 20,000 square metres required prior environmental clearance. This is how EIA promotes energy efficiency indirectly – clearance conditions can require efficient design, water management, waste handling, and air-quality safeguards for large projects.

The framework has evolved. In 2016, the government linked environmental conditions directly to building permissions. A new institutional structure introduced self-declaration of compliance and certification by Qualified Building Environment Auditors empanelled by the Ministry of Environment, Forest and Climate Change, with local bodies stipulating environmental conditions while granting building permission. The aim was to decentralise and streamline clearance for the construction sector.

A recent legal turn worth knowing 🔗

The thresholds have been contested in court. A 2025 amendment had exempted certain projects such as educational institutions and hostels up to 1,50,000 square metres from prior clearance, but the Supreme Court in Vanashakti v Union of India held that environmental clearance is necessary for all large-scale building and construction projects. This shows that the regulatory line between development and environmental protection is still being actively drawn.

Green building rating systems 🔗

The third front is voluntary recognition. Codes set the floor and EIA gates the largest projects, but rating systems reward buildings that go further. A green building rating system is an evaluation tool that measures a building’s environmental performance across its life cycle, using criteria with pre-assigned points and independent third-party evaluation. Two systems dominate in India.

GRIHA 🔗

GRIHA (Green Rating for Integrated Habitat Assessment) is the homegrown national system. It was conceived by TERI (The Energy and Resources Institute), developed jointly with the Ministry of New and Renewable Energy, and adopted as the national rating system for green buildings by the Government of India in 2007. GRIHA evaluates buildings against criteria spanning sustainable site planning, health and well-being, building planning and construction, energy end use, renewable energy, water recycling and reuse, waste management, and indoor air quality. A distinctive feature is its emphasis: GRIHA integrates life-cycle thinking strongly and places energy use above other categories.

LEED India 🔗

LEED (Leadership in Energy and Environmental Design) is the internationally recognised system. It represents the U.S. Green Building Council’s standard for what constitutes a green building, and LEED-India was adapted from the USGBC version for Indian conditions. In comparison, LEED allocates comparatively more points to materials, while GRIHA leans harder on energy – so the two systems share aims and structure but weigh sustainability differently. India’s green building movement gained early momentum when the CII-Sohrabji Godrej Green Business Centre in Hyderabad became one of the first buildings in the country to win the prestigious LEED Platinum rating.

What rating systems achieve 🔗

The payoff is concrete. Energy-efficient or green buildings can reduce energy demand by around 40% while also using water and other natural resources more judiciously. Because these systems are largely voluntary, their real strength has been in raising awareness, popularising green design, and giving developers a recognisable benchmark to aim for. Alongside GRIHA and LEED, the Indian Green Building Council (IGBC) also runs widely used rating programmes, giving builders multiple credible pathways.

How the three pieces work together 🔗

It helps to see these not as competing tools but as a stacked system. The codes – NBC, ECBC, and Eco-Niwas Samhita – set the mandatory minimum standards for how buildings are designed. The EIA process acts as a clearance gate for large projects, attaching environmental conditions before construction begins. The rating systems sit on top, encouraging buildings to exceed the minimum and earn recognition for doing so. Together they cover the full journey of a building from drawing board to occupancy, and they steadily nudge the entire construction sector toward lower energy use and a smaller environmental footprint.

What do you think? Should energy codes like ECBC and Eco-Niwas Samhita remain voluntary for states to adopt, or would a uniform mandatory standard across the country serve India’s climate goals better? And do voluntary rating systems like GRIHA and LEED do enough on their own, or only when paired with strong legal enforcement?

References

1. https://policy.asiapacificenergy.org/node/4167
2. https://climate-laws.org/document/national-building-code_0a50
3. https://www.iea.org/policies/2520-energy-conservation-building-code-ecbc-commercial-2007
4. https://etpi.in/indicator_results/b1-energy-conservation-building-code-compliance-and-eco-niwas-samhita
5. https://udit.beeindia.gov.in/ecbc-commercial-buildings-programme/
6. https://www.beepindia.org/eco-niwassamhita/
7. https://www.drishtiias.com/daily-updates/daily-news-analysis/energy-efficiency-in-construction-sector
8. https://www.ielrc.org/content/e0654.pdf
9. https://www.scribd.com/document/883298446/EIA-Notification-2006
10. https://www.lexology.com/library/detail.aspx?g=8b0e2b16-b975-46e3-a7db-fcf8b13a87c3
11. https://www.pib.gov.in/newsite/PrintRelease.aspx?relid=155550
12. https://ebooks.inflibnet.ac.in/esp12/chapter/griha-rating-of-green-buildings/
13. https://www.commercialdesignindia.com/insights/9050-a-summary-of-all-the-indian-rating-systems-for-green-buildings
14. https://www.ejournal.aessangli.in/ASEEJournals/CIVIL32.pdf