DCPR 2034 Explained for Housing Societies

DCPR 2034 is the official rulebook — its full name is the Development Control and Promotion Regulations 2034 — that decides what can legally be built on any plot in Greater Mumbai, the city governed by the Municipal Corporation of Greater Mumbai (MCGM, also called the BMC). For a housing society planning redevelopment, these regulations quietly control the one number that matters most: how much new construction is allowed on your land. That in turn decides how large a flat each member receives, how much corpus and rent the builder can afford to pay, and how many extra flats the builder gets to sell. This guide explains DCPR 2034 in plain English — what FSI is, what "fungible" area means, the difference between base and premium FSI, what TDR is, and the special "33-series" regulations that make old-building, cluster and slum redevelopment possible. Because the exact figures change from plot to plot, we point you to the FSI calculator whenever a real number is needed.

What DCPR 2034 actually is

DCPR 2034 is the set of building and development rules notified for Greater Mumbai alongside the city's Development Plan for the horizon year 2034. The "2034" is a planning target year, not a version number. These regulations replaced the older Development Control Regulations of 1991 and now govern every construction and redevelopment permission that the MCGM grants inside the municipal limits of Greater Mumbai — from the Island City in the south to the eastern and western suburbs. Every approval a redevelopment passes through, from the sanction of plans to the final occupation permission, is tested against these rules.

Two points matter most for a society. First, DCPR 2034 applies only to Greater Mumbai. The rest of Maharashtra — Thane, Navi Mumbai, Pune, Nagpur and other municipal areas — follows a separate rulebook called the UDCPR (Unified Development Control and Promotion Regulations). So if your building is inside MCGM limits, DCPR 2034 is your law; just outside those limits, the UDCPR applies, and the numbers differ. Second, the meanings of the key terms are fixed in Regulation 2 ("Definitions") of DCPR 2034. Using those exact meanings — not loose everyday language — is what protects members during negotiations, because a builder's proposal lives or dies on how each of these words is applied.

FSI: the number behind everything

Floor Space Index (FSI) is defined in DCPR 2034 as the ratio of the combined total floor area of all floors of a building to the area of the plot. In plain arithmetic:

FSI = total floor area of all floors ÷ plot area.

For illustration only: if a plot measured 1,000 square metres and the permitted FSI were 2.0, the total floor area allowed would be 2,000 square metres. Double the FSI and you roughly double what can be built — more floors, more flats, and therefore more area to share between members and the builder. This is exactly why every extra decimal point of FSI is worth so much in a redevelopment, and why the "extra flats" that fund a project only exist because the FSI allows them. We deliberately do not print a single "Mumbai FSI" figure here, because the permissible FSI depends on your zone, road width, plot size and which redevelopment regulation applies. Your plot's real number comes from the FSI calculator.

A related term is built-up area — under DCPR 2034 this is the area a building covers on all floors including cantilevered portions, but excluding cladding and anything specifically exempted from FSI computation. Built-up area is not the same as the carpet area you actually live in, which is explained further down. Keeping these two apart is one of the most useful habits a committee can build.

Fungible Compensatory Area (Regulation 31(3))

"Fungible FSI" is the phrase everyone uses; the correct official term in DCPR 2034 is Fungible Compensatory Area. It is built-up area permitted over and above the admissible FSI, granted by special permission of the Municipal Commissioner under Regulation 31(3), generally on payment of a premium to the corporation.

In practical terms, fungible area is extra construction the builder can add on top of the base entitlement. Part of it can be passed on to members as larger flats, and part helps the builder increase the saleable portion. Because it sits above the base FSI and is paid for separately, how much fungible area is used — and who benefits from it — is an important line item to check in any redevelopment proposal. A member's flat can grow meaningfully depending on how this area is allocated, so it should never be left vague in the agreement.

Carpet area: the two meanings you must know

Members care about carpet area — the space you can actually lay a carpet on. DCPR 2034 gives it two related but distinct meanings, and confusing them costs members real space.

1. The general (RERA) meaning: the net usable floor area of a unit inside a building, excluding the area covered by walls and areas exempted from FSI computation. This carries the same meaning as under the Real Estate (Regulation and Development) Act, 2016 (RERA). This is the figure your sale agreement and your new-flat promise must be written in.
2. The special rehabilitation meaning: for redevelopment schemes carried out under Regulations 33(5), 33(7), 33(7)(A), 33(9), 33(9)(A), 33(10) and 33(10)(A), carpet area is the net usable floor area excluding walls and exempted areas. This is the exact basis on which each existing member's entitlement — the "rehab" flat — and the redevelopment incentive are measured.

The lesson for members is simple: always insist that the area promised to you is stated as carpet area, never "built-up" or "saleable", and that the definition used matches DCPR 2034 and RERA. If any term in your offer is unclear, the plain-language FAQ and glossary defines each one.

Base FSI, premium FSI and TDR

The total construction allowed on a plot is usually built up from several layers, not one figure:

• Base FSI — the basic quantum of construction allowed on the plot as of right, without paying anything extra.
• Premium FSI — additional FSI that can be purchased from the planning authority on payment of a premium. The premium FSI regulations set out how much is available and at what charge, and the premium is a source of revenue for the authority. The exact amount is plot-specific, so we describe it generally and leave the figure to the calculator.
• Transferable Development Rights (TDR) — dealt with under DCPR 2034 Regulation 34. TDR is development potential generated on one plot (for example, when land is surrendered for a public purpose such as a road or amenity) that can be "transferred" and loaded onto a different receiving plot instead of being used where it arose. How much TDR a plot can absorb again depends on the plot's own characteristics.

Stacked together — base FSI, fungible area, premium FSI, TDR and any redevelopment incentive — these decide the total buildable area. To see how the base and additional components add up for your plot, use the additional area calculator.

The 33-series: the redevelopment incentive regulations

Old buildings are usually not worth redeveloping on base FSI alone — after rehousing every existing member there would be little or nothing left for the builder to sell. The regulations that fix this sit in the Regulation 33 family. They grant extra FSI or incentive area for specific kinds of redevelopment, so that a builder can rehouse existing members and still have a saleable portion left over. The main ones for Mumbai societies are:

A "cluster" here uses the DCPR 2034 definition — any defined area with proper access made up of dwelling units, buildings and chawls — which is why 33(9) can combine several societies and structures into one scheme. Cessed buildings are old structures that pay a repair cess, and their redevelopment often involves the Maharashtra Housing and Area Development Authority under the MHADA Act, 1976. Regulations 33(5), 33(9)(A), 33(10) and 33(10)(A) cover further categories of redevelopment scheme; where they apply, the same special rehabilitation carpet-area meaning explained above is used to measure each member's entitlement.

For deeper, scheme-specific explanations, see our guides on DCR 33(7) cessed buildings and cluster redevelopment. The exact incentive FSI under any of these regulations is always plot-specific — never accept a single universal figure, and confirm yours with the FSI calculator.

How road width and plot size change your entitlement

Two physical facts about your land heavily influence what DCPR 2034 lets you build. The first is the width of the road your plot faces. Wider access roads generally allow a greater quantum of construction and more loading of premium FSI and TDR, while a narrow road caps how much can be added — because more built-up area means more people, vehicles and services that the surrounding road must support.

The second is plot size and shape. Larger plots must set aside statutory open space and, where applicable, amenity space — space reserved for public amenities such as recreational open spaces, welfare centres, markets or schools, as defined in DCPR 2034. Setbacks, marginal open spaces and layout rules all consume part of the plot before FSI is even applied. This is why two societies with the same paper FSI can end up with very different real outcomes. To model how road width and plot area affect the additional area available to you, use the additional area calculator.

How it all becomes your new flat

Every layer above finally converts into two buckets of construction:

• The rehabilitation (rehab) component — the new flats for existing members. Under the 33-series schemes this is measured in carpet area, usually your present carpet area plus an agreed increase.
• The free-sale component — the flats the builder sells in the open market to recover construction cost and earn a profit.

The total buildable area (base FSI + fungible area + premium FSI + TDR + incentive) is split between these two buckets. The larger the incentive your plot qualifies for, the more room there is to give members bigger flats, a healthier corpus and fair rent during construction — while still leaving the builder a viable sale component. This is exactly why understanding DCPR 2034 before you negotiate is worth the effort: the regulations set the size of the pie, and your agreement decides how it is shared. Once you have competing proposals, put them side by side with the offer comparison tool so the promised carpet area, corpus and rent can all be judged on the same basis.