Mumbai’s redevelopment boom is transforming its skyline, but can its infrastructure and natural systems sustain the vertical expansion? As ageing buildings give way to towers, roads remain congested, water demand rises and open spaces shrink. Without scientific planning, urban renewal could deepen the crises it is expected to address.
At a discussion organised by NatConnect Foundation and the Mumbai Press Club last fortnight, Debi Goenka, executive trustee, Conservation Action Trust, gave this contradiction a memorable label: ‘devilopment’. “And a handful of builders and politicians are benefiting from it. The base FSI (floor space index) or plot-to-construction ratio has increased from 1 to 4, crossing the carrying capacity. The development Mumbai is witnessing is not scientific,” he added.
The concern also forms the core of NatConnect’s October 2026 policy paper, Towering Crisis: The City We Are Rebuilding. It argues that redevelopment must be assessed not merely building by building, but against the capacity of Mumbai and the wider Mumbai Metropolitan Region (MMR) to provide water, power, transport, drainage, sewerage, public services and ecological protection.
The market momentum is clear. A September 2026 JLL report, Redevelopment in Mumbai: The Inflection Point, records more than 1,000 redevelopment projects launched since 2020. Redevelopment accounted for 15 per cent of Mumbai’s housing sales in 2025 and the first half of 2026, when more than 1,600 self-redevelopment proposals were active.
Anarock’s first-quarter 2026 assessment recorded about 40,000 residential launches and 32,800 sales across the MMR. The launches represented about 32 per cent of new supply across India’s top seven cities. These figures cover the wider housing market, not redevelopment alone, but illustrate the scale of demand infrastructure must accommodate across the wider metropolitan region.
“A city cannot claim progress merely because it builds upwards,” argues B.N. Kumar, director, NatConnect Foundation. “It must build resilience into every floor, every neighbourhood and every infrastructure decision.”
The sprawl spreads: The pressure is no longer confined to Mumbai’s island city. Navi Mumbai was conceived partly to decongest the metropolis, but it too faces growing congestion. Further expansion around Navi Mumbai International Airport, including the proposed ‘Third Mumbai’ in Raigad and plans for a ‘Fourth Mumbai’ in Palghar, raises questions about whether new urban centres will avoid the problems they are meant to solve.
The metropolitan region has risked extending urban sprawl, rather than resolving it, cautions Stalin D, founder, Vanashakti. Navi Mumbai, originally planned as a pressure-release valve for Mumbai, has itself become congested, he notes.
As urbanisation spreads, wetlands, mangroves, salt pans, hills and other natural areas face competing demands for land. Once these buffers are lost, the region becomes more dependent on expensive engineered solutions to manage flooding, heat and water stress.
NatConnect calls for development decisions to be tested against the capacity of entire neighbourhoods and catchments. Its proposed MMR Urban Capacity Observatory would bring key indicators together, allowing residents and authorities to assess cumulative pressures rather than relying on isolated project-level clearances.
Water: the looming test
Water may prove to be one of the sharpest constraints on Mumbai’s vertical ambitions. The study cites projected water demand of 6,535 million litres per day (mld) by 2041, against current municipal supply of about 4,000 mld. Planned supply augmentation could improve the position but outcomes will depend on project commissioning, distribution, efficiency and future demand.
Where borewells supplement municipal supplies, excessive extraction can lower water tables and cause wells to dry up. Dense construction and impermeable surfaces can also reduce the land through which rainwater seeps into the ground and replenishes aquifers.
In coastal areas, falling groundwater pressure can disturb the balance that helps keep seawater out of freshwater aquifers, increasing the risk of saline intrusion. The extent varies with local geology and extraction patterns, but salinised groundwater can be difficult and costly to restore. This risk cannot be overlooked. Groundwater depletion does not automatically threaten skyscraper foundations and the danger is not uniform across the city. Foundation performance depends on site-specific soil, rock, groundwater chemistry and engineering.
Nevertheless, saline exposure can corrode susceptible materials, while changing subsurface conditions warrant careful geotechnical assessment. The question is whether groundwater monitoring, recharge, rainwater harvesting and wastewater reuse are keeping pace with rising demand. Without such measures, the city could become increasingly dependent on distant sources and costly alternatives while depleting local reserves.
Bittu Sahgal, founder, Sanctuary Nature Foundation & editor, Sanctuary Asia, links ecological decline to the quality of urban life. “City is an act of faith,” he says. “Look what is happening to our anger levels, happiness levels. The worst is that our aquifers are getting polluted and no one seems to bother about this,” he adds.
Sahgal also warns that rainfall patterns are becoming increasingly unpredictable, mixing “too much rain, too little rain and unpredictable rains”. That uncertainty makes protecting natural drainage systems and groundwater recharge areas more important.
Beyond permission
NatConnect argues that the problem is not simply a shortage of infrastructure but the absence of a consolidated picture of how much additional pressure the city can absorb. Information on redevelopment, population, water, transport, drainage, power, waste, schools, hospitals and fire services remains fragmented across agencies.
Prerna Yadav, associate director, Urban Design Research Institute, stresses the importance of public understanding of planning frameworks, including the development plan, development control and promotion regulations, as also comprehensive accessibility plan. Co-ordination among citizens and agencies, she says, remains inadequate.
The report proposes a public MMR Urban Capacity Observatory to track development and infrastructure indicators, alongside carrying-capacity assessments and post-occupation audits. The purpose is to determine whether promised services are adequate once new buildings are occupied.
Transport planning illustrates the scale of the challenge. MMRDA’s 2041 plan envisages extensive expansion of metro, suburban rail and highways, with estimated transport investment of R5.01 lakh crore. Such infrastructure is essential, but projects take time to complete. Residential towers can fill up long before roads, public transport and civic services catch up.
Redevelopment may provide safer buildings and modern amenities, but benefits are not evenly distributed. Residents can face relocation costs, higher maintenance charges and difficulty returning to neighbourhoods, where property values have risen. Meanwhile, the wider population bears pressure on roads, water and public services.
The market data raise questions about who can afford the city being rebuilt. Anarock’s first-quarter 2026 figures show that 22 per cent of new residential launches in the MMR were priced below R40 lakh, while 12 per cent were priced above R4 crore. Knight Frank’s affordability index for the first half of 2026 put the MMR’s home-loan EMI-to-household-income ratio at 69 per cent – above the 50 per cent threshold commonly used to indicate unaffordability.
More construction does not automatically translate into housing ordinary households can afford. The test is whether redevelopment renews the city for its existing population or increasingly caters to buyers able to pay a premium.
Mumbai’s remaining natural assets are central to the debate. Wetlands and floodplains can temporarily store excess rainwater; mangroves support coastal ecosystems; trees provide shade; and permeable soil helps rainfall infiltrate the ground. Their destruction can intensify flooding and heat.
NatConnect’s report cites accessible open space at about 3.7 per cent of Mumbai and per-capita green cover of about 1.8 sq m. It also records a decline in vegetation cover from 46.42 per cent in 1988 to 26.67 per cent in 2018. These figures assume greater significance in the context of the 3-30-300 rule for urban greening, proposed by urban forestry expert Cecil Konijnendijk, professor & director, Nature-based Solutions Institute. The guideline recommends that every resident should be able to see at least three trees from home, live in a neighbourhood with at least 30 per cent tree-canopy cover, and have access to a quality public green space within 300 metres.
Subhajit Mukherjee, founder, Mission Green Mumbai, highlights rainfall uncertainty and the need to expand wastewater reuse. “The next 24 months are going to be tough,” he says, pointing to challenges posed by rainfall deficits and climate uncertainty.
“We are exhausted with land,” cautions Gurbir Singh, veteran journalist & housing-rights activist, summing up the dilemma. The redevelopment spree has become a sort of drug. As land is not available, the housing complexes are becoming taller, while grappling with roads of the same width as before and compounding the water crisis.”
Mumbai’s future cannot be measured by the height of its skyline alone. If groundwater dwindles, natural buffers disappear, and civic services fall behind, the towers may continue to impress, while the city before them becomes less resilient.