Last week we looked at DCPR 2034 as a whole — where it comes from, what it governs, and why it sits at the centre of Mumbai’s development economics. This week we go into the part of it that shapes almost every deal in the city: how much you can actually build.
Floor Space Index and Transferable Development Rights are the two instruments that answer that question. They work together elegantly once you see the structure, and the goal this week is to make that structure clear enough that you can look at any plot in Mumbai and reason through its potential yourself.
Starting with the basics
Floor Space Index is a ratio — total built-up area divided by plot area. An FSI of 2.0 on a 1,000 sq m plot means you can build 2,000 sq m, spread across whatever number of floors the height and setback rules allow.
The useful insight is that permissible FSI isn’t a single number handed down by the regulation. It’s built up in layers, each drawn from a different source and available on different terms. Once you can see the layers, a phrase like “FSI 2.4” stops being a figure and becomes a structure you can work with.
One helpful detail before we go further. DCPR 2034 computes FSI on gross plot area — the whole plot, before deductions for road setbacks and internal roads. DCR 1991 used net area, after those deductions. It’s a small definitional shift that meaningfully increases developable area on plots with road widening obligations, and it’s one of the quieter improvements in the 2018 framework.
The road width principle
Here’s the idea at the heart of DCPR 2034’s FSI structure, and it’s a genuinely good one.
A building’s residents need to get in and out — cars, deliveries, emergency access, all of it moving through the road in front. So the regulation ties how much you can build to the capacity of that road. Wider road, higher FSI. It calibrates density against the infrastructure that carries it, which is exactly what good planning should do.
Here’s how it works in the Island City for residential and commercial development:
| Road width | Base FSI | Premium FSI | Admissible TDR | Total permissible |
| Below 9 m | 1.33 | — | — | 1.33 |
| 9 m to 12 m | 1.33 | 0.50 | 0.17 | 2.00 |
| 12 m to 18 m | 1.33 | 0.62 | 0.45 | 2.40 |
| 18 m to 27 m | 1.33 | 0.73 | 0.64 | 2.70 |
| 27 m and above | 1.33 | 0.84 | 0.83 | 3.00 |
Two features of this table are worth sitting with.
Look down the base FSI column — it’s 1.33 at every row, the same figure that existed under DCR 1991. In the Suburbs it’s 1.00, also unchanged. DCPR 2034 kept the base steady and built the entire increase into the layers above it. That’s a deliberate design choice, and it means the interesting questions are always about the upper layers.
And look at how much range there is. The same land, in the same zone, can support 1.33 or 3.00 depending on its access. The road is a genuine asset characteristic, and reading it correctly early in a transaction is one of the more valuable habits in this business.
Premium FSI
Premium FSI is additional development rights purchased directly from the planning authority. It’s priced as a percentage of the Annual Statement of Rates for that location, and the revenue is shared between the municipal corporation and the state government.
There’s a nice logic to this. Density generates public revenue, and that revenue funds the infrastructure that makes higher density work. The mechanism sustains itself, and it has become a meaningful contributor to municipal finances — which benefits the city that all of us are building in.
Practically, it’s the most straightforward layer to work with. The price is published, the process is administrative, and there’s no counterparty to negotiate with. You know your cost before you begin.
TDR
Transferable Development Rights are the most interesting instrument in the framework, and worth understanding properly.
Start with what they solve. The city regularly needs private land for public purposes — widening a road, creating a park, building a school. The owner has to be compensated. Rather than paying cash, which is expensive and slow, the government issues a certificate representing the development potential of the surrendered land. The owner can use it elsewhere or sell it to someone who will.
The city gets its land. The owner gets full value. Development rights, rather than rupees, do the work.
Three aspects of DCPR 2034’s TDR framework are especially worth knowing.
TDR is now usable in the Island City. Under DCR 1991 it was largely a suburban instrument, which kept demand away from where the highest land values sit. Extending it to the Island City deepened the market considerably — and a deeper market means better compensation for everyone surrendering land anywhere in Mumbai.
The quantum is indexed to ready reckoner rates. This is the refinement I’d point to as the framework’s smartest feature. Rather than a flat area-for-area exchange, both the TDR generated and the TDR usable are calibrated against relative land values at each end. A high-value receiving zone absorbs proportionally less TDR area, which keeps values consistent across a city where land prices vary enormously from one location to the next.
TDR sits inside the total, not above it. Return to the table — on a 12-metre road in the Island City, admissible TDR is 0.45. That’s a component of the 2.40 total, not an addition to it. This cap is what allows the road-width principle to hold together across the whole framework.
Fungible FSI
Above all of this sits one more layer, and it works differently.
Fungible Compensatory Area allows up to 35% additional built-up area over and above your total permissible FSI, on payment of premium. It’s called fungible because it can be deployed flexibly — balconies, flower beds, service areas, features that would otherwise consume FSI.
Two points make it commercially significant. It applies to your total permissible FSI rather than your base, so it compounds — a plot at 3.00 picks up roughly another 1.05, taking the effective figure past 4.00. And in several redevelopment schemes, including slum rehabilitation, cessed building redevelopment, and affordable housing, fungible area may be granted without premium. On the right project, that materially improves the economics.
The full stack
For an Island City plot fronting a 27-metre road:
1.33 base + 0.84 premium + 0.83 TDR = 3.00 permissible FSI
Plus fungible at 35% = approximately 4.05 effective FSI
Four layers, four different sources, one number at the end. Once you can assemble that stack from first principles, you can evaluate any plot in Mumbai without waiting for someone to hand you the answer.
That’s the real value of this week’s material. Not the individual figures — those you can always look up. The structure, which stays constant, and which turns a regulation into a tool you can actually use.
A note on precision
The figures above reflect the structure as notified. As we discussed last week, DCPR is a living framework — premium rates are revised alongside the annual ready reckoner, and several provisions have been refined by circular since 2018. The architecture is stable and worth learning thoroughly. The specific numbers are worth verifying against the current position before they go into a model.
Next week
Next week, we move from the general FSI stack to the special schemes that shape much of Mumbai’s actual construction pipeline. Regulation 33 is where DCPR becomes most visible on the ground — in slum rehabilitation, MHADA redevelopment, cluster redevelopment, cessed building renewal, and self-redevelopment. Each scheme has its own purpose, incentive structure, and development logic, but together they explain how the city uses regulation not just to control growth, but to unlock housing, rehabilitation, and renewal at scale.