MUMBAI: Every old building pulled down for redevelopment creates mountains of debris. For a city witnessing one of the country’s biggest redevelopment drives across ageing housing societies, MHADA colonies, cessed buildings and infrastructure projects, experts say the real opportunity lies not in disposing of this waste, but in treating it as a valuable raw material for the next phase of construction.Architect and interior designer Moayyed Fatehi argues that construction and demolition (C&D) waste should be viewed as an “urban mine” capable of supplying recycled materials for new buildings, roads and public infrastructure. With landfill space shrinking and environmental concerns rising, he says recycling building waste can become a crucial pillar of sustainable urban development.The building sector is among the largest consumers of natural resources and one of the biggest generators of inorganic waste. Fatehi estimates that nearly 70-80% of construction waste can be repurposed if it is properly segregated and processed, reducing dependence on virgin materials while lowering the environmental impact of redevelopment.The principle, he says, extends beyond the familiar “Reduce, Reuse and Recycle”. It requires designing a circular economy in which materials from demolished buildings return to the construction cycle instead of ending up in landfills.Proper segregation at source is critical. Organic, biodegradable, inorganic and hazardous waste must be separated before recycling begins, making recovery of usable materials more efficient and preventing contamination.Concrete from demolished buildings can be crushed into recycled aggregates for structural fills, utility backfilling and road construction. Broken brick masonry can be reused in waterproofing beds, landscaping or processed into material for manufacturing fresh bricks.Metals offer even greater potential. Structural steel, reinforcement bars, copper wiring and aluminium can be recovered, melted and recycled without losing their engineering properties, reducing both mining pressure and manufacturing emissions.Wood waste, another significant component of demolition debris, can be converted into medium-density fibreboards, particle boards and wood-cement composite panels used in interior and exterior applications. Discarded ceramic tiles can also find a second life as decorative china mosaic flooring.Fatehi notes that while some construction debris is suitable for reclamation works, hazardous materials such as lead-based products, certain plastics and chemically contaminated waste require separate handling because of their environmental risks.He also points to emerging technologies that could expand the use of recycled materials. Digital design tools and specialised computer software now make it possible to incorporate recycled building components into new construction while maintaining structural performance and design flexibility.As Mumbai pursues large-scale redevelopment and infrastructure expansion, the challenge is no longer merely managing debris but ensuring that valuable construction materials remain within the economy instead of becoming waste. Experts say such a shift can reduce pressure on landfills, conserve finite natural resources and support lower-carbon urban growth.For a city rebuilding itself at an unprecedented pace, the next generation of buildings may increasingly rise from the materials of those they replace—turning demolition into the first step of sustainable construction rather than the last stage of a building’s life.Ends
