India’s infrastructure build-out is advancing at a scale and pace rarely seen before, cutting across airports, highways, rail networks, ports, metros and urban water systems. The sheer scale of development is intensifying pressure on natural resources and urban ecosystems, bringing sustainability to the forefront of infrastructure planning. Against this backdrop, construction techniques are rapidly transitioning from peripheral best practices of sustainable execution to core project imperatives. What distinguishes the current phase is not merely the adoption of green materials or energy-efficient equipment, but a systemic shift in how infrastructure assets are conceived, designed, built and operated across their entire life cycle.
The convergence of climate commitments, tightening environmental regulations, resource scarcity and investor scrutiny is forcing infrastructure developers to rethink conventional construction models. Increasingly, sustainable aspects are being considered and detailed out at the planning and construction stage through water-sensitive designs, low-carbon materials, prefabrication, waste valorisation and digital optimisation. These techniques are no longer limited to pilot projects but are being scaled across large national programmes such as PM Gati Shakti, Bharatmala, Sagarmala, metro rail expansions and airport modernisation initiatives.
Embedding sustainability into high-impact infrastructure
Airports
Airport construction has emerged as one of the most visible test beds for sustainable construction practices, given the sector’s scale and complexity of construction and operations. Recently executed and expanded projects demonstrate a decisive shift towards embedding water efficiency directly into construction workflows. Airports such as Madurai, Trichy and Chennai have significantly reduced dependence on groundwater by integrating decentralised treatment systems and alternative water sourcing during construction and expansion works. These measures are particularly critical for airports located in water-stressed regions, where sustainable construction planning now prioritises life cycle water security alongside capacity expansion.
Material innovation has further strengthened sustainability outcomes in airport construction. One of the recent landmark developments was the adoption of limestone calcined clay cement (LC3) at the Noida International Airport, making it India’s first large airport project to deploy low-carbon cement at scale. This initiative demonstrated that LC3 can deliver up to 40 per cent lower carbon emissions compared to conventional portland cement without compromising on structural integrity. Similarly, Delhi’s Indira Gandhi International Airport recently became the first airport in the country to receive the IGBC Net Zero Waste to Landfill Platinum certification, diverting about 95 per cent of the solid waste from landfills through segregation, recycling and composting systems. Beyond water and materials, airports are increasingly integrating renewable energy systems, electric construction equipment and digital construction management platforms during project execution.
Roads and bridges
The road sector, among the most emissions- and material-intensive sectors, is undergoing a sustainable transition, driven by circular economy principles and policy-backed execution. Sustainable road construction is being supported by regulatory frameworks that directly link environmental performance with project approvals, execution permissions and funding eligibility. The Ministry of Road Transport and Highways has reinforced its circular economy push by embedding mandatory provisions for fly ash use, steel slag and processed municipal solid waste into engineering, procurement and construction (EPC), and hybrid annuity model-based tenders. In fact, large-scale integration of industrial and municipal waste into highway construction has moved from pilot initiatives to mainstream practice. Under the Pradhan Mantri Gram Sadak Yojana, around 44,000 km of road construction has been completed using plastic waste (till August 2025).
According to industry reports, fly ash is also widely reused for road and flyover construction, accounting for around 32 per cent of the total fly ash utilisation in 2024-25, including backfilling, embankments and other infrastructure uses. Fly ash utilisation has expanded sharply along Bharatmala corridors, particularly in states with high thermal power generation, where ash is now routinely used for embankments and pavement layers to improve their strength and stability. To this end, India’s national highways reported a cut in the greenhouse gas intensity from 1.0-0.8 MTCO2e per km, with 63.1 million tonnes of recycled materials such as fly ash, plastic waste and reclaimed asphalt used in construction. The plastic-modified bitumen has been deployed across national and state highways in Uttar Pradesh, Tamil Nadu and Maharashtra, with over 1,200 tonnes of shredded plastic waste consumed by 2025. These roads have demonstrated enhanced moisture resistance and durability, extending pavement life and lowering long-term maintenance-related emissions.
Furthermore, India is piloting plastic-based geocell technology in road construction, where about 20-25 tonnes of end-of-life plastic waste was used to build an around 160 metre trial section on a road section near the DND-Faridabad-KMP Expressway, improving load-bearing capacity and turning waste into infrastructure material. Similarly, pilot projects have deployed steel slag and blast furnace slag in road construction at specific sites, including a flexible pavement section at Hazira port, where processed steel slag was used and the first steel slag road segment on NH-66 (Mumbai-Goa Highway).
Ports
Port infrastructure is increasingly being shaped by sustainability-led construction frameworks as India accelerates maritime capacity expansion. Recent port modernisation projects are aligned with the Harit Sagar-Green Port Guidelines, which mandate water efficiency, pollution control and energy optimisation across construction and operations. Major ports such as the Jawaharlal Nehru Port Authority, Paradip port and Deendayal Port have embedded sustainability clauses into their EPC contracts, requiring contractors to minimise freshwater withdrawal and manage construction runoff responsibly. According to the Ministry of Ports, Shipping and Waterways, several port expansion projects now operate on-site effluent and wastewater treatment systems, enabling treated water reuse for concrete curing, equipment washing and dust suppression. This is critical in coastal zones, where freshwater stress and ecological vulnerability are pronounced. Rainwater harvesting systems and engineered stormwater drains are also being integrated into port layouts to prevent sediment-laden runoff from entering marine ecosystems during construction.
Sustainability measures are extending beyond the core infrastructure to encompass auxiliary facilities, which traditionally account for significant environmental impacts. At ports such as Visakhapatnam and Cochin, redevelopment and expansion projects have introduced decentralised sewage treatment plants, solid waste segregation systems and reuse of treated water within labour camps and site offices. Renewable energy integration, particularly rooftop solar installations powering temporary offices, lighting and surveillance systems, is becoming a standard practice under green port implementation frameworks. These interventions, highlighted in recent Harit Sagar guidelines and port authority disclosures, demonstrate a life cycle-oriented approach where even temporary construction ecosystems are designed to minimise pollution, reduce resource consumption and lower emissions.
Railways
Indian Railways has significantly expanded the use of precast viaduct segments, platform components and station structures, reducing reliance on in-situ construction in congested corridors. This shift to factory-controlled manufacturing has helped minimise material wastage, dust and noise pollution, while lowering diesel consumption from repetitive on-site activities. Metro projects in cities such as Delhi, Chennai and Bengaluru have also embedded water stewardship into construction planning by deploying decentralised wastewater treatment systems to recycle water from labour camps, site offices and air-conditioning condensate for curing and landscaping, thereby reducing freshwater withdrawal. Complementing these measures, digital tools such as building information modelling and data-driven project monitoring platforms are now being widely used across railway projects to optimise material quantities, reduce rework and improve construction sequencing. These combined interventions are enabling Indian Railways to lower embodied carbon and resource intensity at scale.
Other urban infrastructure
Urban rail projects across major Indian cities significantly deepened their reliance on industrialised and resource-efficient construction practices. Metro authorities such as Chennai Metro Rail Limited (CMRL) expanded the use of precast viaduct segments, station components and long-span girders, enabling faster execution, while sharply reducing on-site dust, noise, congestion and diesel consumption in dense urban corridors. Sustainability has also been embedded at the institutional level. For instance, in October 2025, the CMRL headquarters at Nandanam received the IGBC Platinum certification, reflecting integrated approaches to water efficiency, material optimisation and energy-efficient construction practices adopted during development.
In parallel, water supply and wastewater infrastructure construction is undergoing a quiet but significant transformation, driven by decentralised, low-impact and indigenous technologies. Modular treatment plants, energy-efficient pumping systems and solar-integrated facilities are enabling faster construction with lower resource intensity, while improving long-term operational resilience. Research and innovation have played a critical role recently, as IIT Bhilai researchers develop a sustainable polymer technology that upcycles toxic industrial sulphur waste into advanced materials capable of selectively removing pollutants from water.
Similarly, in October 2025, researchers from BITS Pilani (Goa Campus) and IIT Kharagpur introduced an indigenous nanobubble technology that enhances wastewater treatment efficiency, while lowering energy consumption and maintenance costs, making it viable for large-scale deployment. In May 2025, an indigenous nanoporous multilayered polymeric membrane was also developed by the Defence Materials Stores and Research and Development Establishment laboratory of the Defence Research and Development Organisation for high-pressure seawater desalination. Its initial trials conducted by Indian Coast Guard vessels yielded satisfactory results.
From compliance to building competitive advantage
Sustainable construction in India’s infrastructure sectors is moving beyond regulatory compliance towards strategic value creation. The integration of water stewardship, circular materials, industrialised construction and digital technologies is redefining how infrastructure assets are delivered and managed. While challenges remain in terms of supply chain readiness, financing and skill development, the direction of travel is clear.
As sustainability becomes integral to procurement norms, investor expectations and performance benchmarks, construction techniques that reduce resource intensity and carbon emissions will increasingly confer a competitive advantage. India’s experience demonstrates that sustainability and scale need not be mutually exclusive. Instead, they can reinforce each other, enabling the country to build infrastructure that is not only larger and faster, but also more resilient, efficient and future-ready.
Shubhangi Goswami
