FSI in Real Estate: How Mumbai, Bengaluru, Hyderabad, Amaravati and Vizag Compare
Every property buyer in India runs into three letters sooner or later: FSI. It sits quietly in the fine print of a builder’s brochure, yet it decides how tall a building can rise, how many flats a project can hold, and in many cases, how much you end up paying per square foot. Two plots of identical size in two different cities can carry wildly different construction potential, and FSI is the reason why.
This piece breaks down what FSI actually means, how it is calculated, and how the rule differs across India’s major property markets, including two cities that are drawing fresh investor attention for very different reasons: Amaravati, the upcoming capital of Andhra Pradesh, and Visakhapatnam (Vizag), its largest commercial hub.
What Is FSI (Floor Space Index)?
Floor Space Index, also called Floor Area Ratio (FAR) in several cities and abroad, is a town planning number that fixes the maximum built-up area a developer is permitted to construct on a given plot. It is worked out with a simple formula:
FSI = Total Built-Up Area ÷ Total Plot Area
Take a plot measuring 1,000 sq. ft. If the sanctioned FSI is 2.0, the builder may put up a total of 2,000 sq. ft. of construction on it, spread across as many floors as height and setback rules allow. Raise the FSI and the same plot supports more flats, more floor space for sale, and often a taller building. Lower it, and construction stays limited no matter how much land is available.
FSI and FAR describe the same thing. In everyday Indian real estate usage, FSI is the term you will hear in Mumbai, Bengaluru and most western and southern cities, while FAR is the word used in Delhi and in much of the rest of the world. Some authorities express the number as a decimal (2.0), others as a percentage (200%), but the underlying calculation stays the same.
A related term worth knowing is TDR, or Transferable Development Rights. TDR lets a landowner who has unused development potential on one plot sell or transfer that unused potential to another plot, usually in exchange for cash or certificates issued by the local authority. This allows a developer to build beyond the base FSI limit on a receiving plot, provided the authority approves the transfer. TDR is especially active in Mumbai and Pune, where base FSI in older, congested zones is kept deliberately low.
Why FSI Rules Differ So Much From City to City
FSI is not a national standard. Every state and, within a state, often every development authority sets its own limits based on road width, water supply capacity, sewage infrastructure, fire safety access, heritage status and how crowded the area already is. A narrow inner-city lane in Mumbai and a wide arterial road in Hyderabad will never carry the same construction rights, even if the plot sizes match exactly. This is the single biggest reason property economics look so different across Indian cities, and why the same investment amount buys such different amounts of built-up space depending on where you put it.
City-Wise FSI Comparison
Mumbai
Mumbai runs one of the tightest FSI regimes in the country, a legacy of an island city with almost no room left to expand outward. The base FSI in the island city area sits around 1.33, while the suburbs are even more restrictive, typically between 0.5 and 1. Redevelopment projects under MHADA can go up to 2.5, and premium FSI along with TDR is frequently purchased to push projects higher, particularly in the western and central suburbs where demand for housing far outstrips the land on offer. This scarcity is a core reason Mumbai carries the highest per-square-foot property rates in India.
Bengaluru
Bengaluru’s FSI, regulated by the BBMP and BDA, ranges roughly from 1.5 to 2.75 for residential plots, rising to around 4 in commercial zones. The city also classifies localities as Intensely Developed, Moderately Developed or Sparsely Developed, and the applicable FSI shifts depending on which band a plot falls into along with road width. Wider roads and metro-adjacent plots typically unlock the upper end of the range, which is part of why land near Bengaluru’s expanding metro corridors commands a premium.
Hyderabad
Hyderabad stands apart from almost every other Indian metro because it has no fixed FSI cap for most zones. Depending on road width and the specific plot, effective FSI can reach 6 or even 7, among the most liberal construction density allowances anywhere in the country. This open-ended approach is one reason Hyderabad has seen such rapid vertical growth over the past decade, particularly along the IT corridors of Gachibowli, HITEC City and Financial District, where developers can build significantly larger projects on comparatively smaller footprints than they could in Mumbai or Bengaluru.
Delhi
Delhi uses the term FAR rather than FSI, and under the Delhi Master Plan norms the range typically runs between 1.2 and 3.5, with redevelopment projects permitted up to 4. Plots that benefit from proximity to Delhi Metro corridors are often granted higher FAR to encourage transit-oriented development, a pattern that is increasingly common across Indian cities as authorities try to concentrate density around public transport rather than let cities sprawl outward.
Other Major Metros
For quick reference, Chennai’s FSI generally sits between 1.5 and 2 under the city’s master plan, Pune ranges from 1.5 to 2.5 and can reach 5.5 for slum redevelopment schemes, Ahmedabad allows 1.2 to 1.8 depending on the zone with additional premium purchase options near transit corridors, and Gurgaon stays comparatively conservative at 1 to 1.45 across most sectors.
FSI in Amaravati: Andhra Pradesh’s Capital in the Making
Amaravati sits in a different category altogether because it is being planned from scratch rather than retrofitted onto an existing dense city. Under the current capital city zoning framework, FSI within the designated Capital City area ranges from 0.4 to 5, a spread that reflects the mixed nature of the region, from low-density residential zones to high-rise government and commercial precincts along the core capital corridor.
The Andhra Pradesh government has also notified the Common Zoning Regulations, 2026, which apply across the wider Amaravati Economic Region covering NTR, Krishna, Eluru, West Godavari, Guntur, Palnadu, Bapatla, Prakasam and Markapuram districts, though the Capital City area itself continues to follow its own dedicated regulations rather than this common framework. For investors, this matters because Amaravati’s FSI structure is not a single number the way Mumbai’s suburban FSI is. It is a planned gradient, with room built in for the city to densify over the coming years as government offices, the new Legislative Assembly complex and supporting infrastructure come up. A plot bought today in a designated high-FSI corridor could carry meaningfully more construction rights once the master plan matures further, which is part of the long-term appreciation case that draws investors to a greenfield capital rather than an established metro.
FSI in Visakhapatnam (Vizag)
Visakhapatnam falls under the jurisdiction of the Greater Visakhapatnam Municipal Corporation (GVMC) and the Visakhapatnam Metropolitan Region Development Authority (VMRDA, earlier VUDA). Unlike Amaravati’s capital-specific rules, Vizag follows the Andhra Pradesh Building Rules, 2017 (G.O. Ms. No. 119) along with subsequent amendments, the same statewide framework that governs most municipal corporations and urban development authorities outside the capital region. Under this framework, permissible FSI is tied closely to road width, plot size and building height, with wider roads and larger plots unlocking higher construction potential, broadly comparable to the 1.5 to 2.5 range seen in other tier-1 and tier-2 Indian cities, though specific values depend on the zone and are confirmed at the plan approval stage.
Vizag’s case is a little different from Amaravati’s. It is not a new city being built on a blank map, but an established port city and Andhra Pradesh’s commercial capital, with its own IT and pharma corridors, a working port, and a population already past 2.3 million. Its FSI story is therefore less about a planned future density and more about incremental growth: as VMRDA continues to widen roads and expand infrastructure along growth corridors, more plots become eligible for higher FSI slabs under the existing road-width-linked formula.
Amaravati and Vizag Against the Metro Benchmark
Placed side by side with Mumbai, Bengaluru and Hyderabad, Amaravati and Vizag tell a story about where India’s next phase of urban construction activity is headed. Mumbai’s low FSI reflects a city that ran out of room decades ago and now relies on redevelopment and TDR to add any meaningful supply. Hyderabad’s uncapped approach shows what happens when a city with available land chooses to encourage density rather than restrict it. Amaravati sits closer to the Hyderabad model in spirit, a wide FSI band designed to accommodate rapid, planned growth, but it starts from essentially undeveloped land rather than an existing urban core, which changes the investment horizon considerably. Vizag, meanwhile, behaves more like a maturing tier-1 city working within a standard statewide rulebook, gradually unlocking higher FSI as its infrastructure catches up with its ambitions.
For an investor, the practical takeaway is this: in Mumbai and Bengaluru, you are largely buying into scarcity, where FSI limits keep new supply tight and prices firm. In Hyderabad, you are buying into policy generosity, where liberal FSI has already fuelled a construction boom. In Amaravati, you are buying into a planning bet, where today’s FSI band could translate into materially higher construction rights once the capital’s infrastructure is complete. And in Vizag, you are buying into steady, infrastructure-linked growth, where FSI expands in step with road widening and metropolitan development rather than through a single policy change.
Why FSI Matters Beyond Just Builders
It is easy to assume FSI is a builder’s concern and not a homebuyer’s, but the number filters down into almost every part of a property decision. A higher FSI zone usually means more units in a project, which can translate into smaller common areas per resident, more traffic on surrounding roads, and greater pressure on local water and drainage systems unless the authority has planned for it. A lower FSI zone often means fewer, larger units, more open space, and a calmer neighbourhood, but also a higher price per square foot because supply stays limited. Neither is automatically better. It depends on whether you are buying a home to live in for the next fifteen years or an asset you expect to appreciate on the back of future redevelopment or TDR potential.
Before finalising a purchase, it is worth asking the developer or checking directly with the local authority, whether that is the BBMP, HMDA, MCGM, GVMC, VMRDA or APCRDA, what FSI has actually been sanctioned for that specific plot, and whether any part of the project relies on premium FSI or TDR that is still pending approval. Projects built on assumed rather than sanctioned FSI have run into legal trouble in the past, and that risk is worth ruling out before you sign.
Frequently Asked Questions
What is the difference between FSI and FAR? FSI (Floor Space Index) and FAR (Floor Area Ratio) refer to the same planning ratio: built-up area divided by plot area. FSI is the term commonly used in Mumbai, Bengaluru and most Indian cities, while FAR is used in Delhi and internationally. Some authorities express the figure as a decimal and others as a percentage, but the underlying calculation does not change.
Which Indian city has the highest FSI? Hyderabad currently allows the highest construction potential among major Indian cities, with no fixed FSI cap in most zones and effective values reaching 6 to 7 depending on road width and plot specifics.
Why is Mumbai’s FSI so low compared to other cities? Mumbai is an island city with very limited land available for outward expansion. To manage congestion and infrastructure load, the base FSI is kept low, around 1.33 in the island city and 0.5 to 1 in the suburbs, with developers relying on premium FSI, TDR and redevelopment schemes to add extra construction potential.
What is the FSI in Amaravati? Within Amaravati’s designated Capital City area, FSI ranges from 0.4 to 5, depending on the zone. This wide band reflects the mix of planned low-density residential areas and higher-density government and commercial precincts across the capital region.
Does Visakhapatnam follow the same FSI rules as Amaravati? No. Visakhapatnam falls under the Andhra Pradesh Building Rules, 2017 (G.O. Ms. No. 119) as administered by GVMC and VMRDA, the same statewide framework used across most of Andhra Pradesh outside the capital city, whereas Amaravati’s Capital City area follows its own dedicated zoning regulations.
Can I build beyond the sanctioned FSI on my plot? Only through mechanisms the local authority permits, such as premium FSI (paid additional construction rights, usually on wider roads) or TDR (development rights transferred from another eligible plot). Both require formal approval, and building beyond sanctioned FSI without approval can lead to demolition orders or regularisation penalties.
How does FSI affect property prices? Lower FSI limits the supply of new flats a plot can generate, which tends to push prices per square foot higher, as seen in Mumbai. Higher FSI allows more units on the same land, which can moderate price growth by increasing supply, though it depends heavily on demand in that specific micro-market.