The congested area regime is not a discount on the ordinary rules. It is a different set of rules, built for a place where buildings already touch each other, and it stops applying at 24 metres of height.
Key takeaways
- Table 6-C sets side and rear marginal distances at zero for plots up to 1000 sq m in a congested area, and 1.00 m between 1000 and 4000 sq m.
- Light and ventilation come from interior and exterior chowks under Regulation 6.9 instead of from margins.
- Table 6-A gives basic FSI of 1.50 below a 9.0 m road with no premium and no TDR, and 2.00 at 9.0 m and above with both, so maximum potential jumps from 1.50 to 2.60 in a Municipal Corporation.
- Ancillary area FSI of up to 60 percent of the proposed FSI, and 80 percent for non-residential use, is purchasable at 15 percent of the ASR rate in Pune and Thane and 10 percent everywhere else.
- The concessions expire with height: margins rise by 1.0 m from 15.0 m, and at 24.0 m and above the non-congested rules apply in full.
- On ReraGenie's registry copy captured 11 August 2026, 40.8 percent of published projects statewide sit on a plot of 1000 sq m or less.
What counts as a congested area
Chapter 6, Regulation 6.0, UDCPR as updated 30 January 2025 scopes the regime: it covers land in the congested area, or core area, as shown on the Development Plan, and also gaothan areas in Regional Plans, including areas of local bodies and Special Planning Authorities where no Development Plan or planning proposal is sanctioned. In Nashik Municipal Corporation, 6.1 notes, "core area" means the same thing.
One qualification decides which rulebook a plot uses, and it is covered in full in the margins article: a holding larger than 0.40 hectare inside a congested area moves to the non-congested rules for everything except FSI, which stays here.
FSI turns on nine metres of road
Chapter 6, Regulation 6.1.1, Residential Buildings / Residential Buildings with mixed-use* opens with Table 6-A, and the table is banded by road width.
| Road width | Basic FSI | Municipal Corporations and CIDCO as NTDA: premium FSI, max TDR, max potential | Remaining authorities: premium FSI, max TDR, max potential |
|---|---|---|---|
| Below 9.0 m | 1.50 | None, none, 1.50 | None, none, 1.50 |
| 9.0 m and below 18.0 m | 2.00 | 0.30, 0.30, 2.60 | 0.30, 0.10, 2.40 |
| 18.0 m and below 30.0 m | 2.00 | 0.30, 0.50, 2.80 | 0.30, 0.20, 2.50 |
| 30.0 m and above | 2.00 | 0.30, 0.70, 3.00 | 0.30, 0.20, 2.50 |
The first row is a cliff, not a step. Below a 9.0 m road a plot gets basic FSI of 1.50 and nothing else: no FSI on payment of premium, no TDR loading, and a maximum building potential equal to the basic figure. Cross 9.0 m and the basic rises to 2.00 and both other columns open, taking maximum potential to 2.60 in a Municipal Corporation.
That is a 73 percent increase in what the plot can hold, decided by the width of the street outside it. Two adjacent plots on opposite sides of a road width boundary are not comparable assets, and no amount of premium or TDR closes the gap, because on the narrow side the code does not sell either.
It also means the first document to obtain for a congested area parcel is the prescribed road width, not the zoning. A road that is 8.6 m today and shown wider on the Development Plan is a different valuation from one that is not.
Ancillary area FSI, and the two cities that pay more
A note under Table 6-A adds a layer on top of everything in it. Ancillary area FSI of up to 60 percent of the proposed FSI in the development permission, counting basic, premium and TDR but excluding the items in Chapter 6, Regulation 6.8, Exclusion of Structures / Projections for FSI Calculation*, may be taken on payment of premium calculated on the ASR land rate without considering the guidelines in it. For non-residential use the extent is 80 percent.
| Authority or area | Rate of premium for ancillary area FSI |
|---|---|
| Pune and Thane Municipal Corporation | 15 percent |
| Nagpur and Nashik Municipal Corporations, Municipal Corporations in MMR other than Thane, Metropolitan Development Authority area, and CIDCO as Planning Authority by virtue of being an NTDA | 10 percent |
| All other Municipal Corporations | 10 percent |
| Municipal Councils, Nagar Panchayats and Regional Plan areas | 10 percent |
Pune and Thane pay half again what everyone else pays for the same entitlement. Four more points sit in the same note and each changes a model.
- It is optional, and divisible. Utilisation of ancillary area FSI may be full or partial.
- It is not calculated separately. The entire FSI in the development permission is calculated and measured with reference to permissible FSI, premium FSI, TDR and additional FSI including the ancillary area FSI added into it.
- Mixed use is prorated. In a composite building of mixed users, premium and ancillary area FSI are on a prorata basis.
- It reaches the named schemes but not SRA rehabilitation. It applies to TOD, PMAY, ITP, IT, MHADA and the like, except the rehabilitation component in SRA, and free of FSI items in those schemes other than those mentioned in UDCPR stand deleted.
Margins: the part that makes it a different code
| Plot area | Side margin | Rear margin |
|---|---|---|
| Up to 1000 sq m | 0.00 | 0.00 |
| Above 1000 and up to 4000 sq m | 1.00 m | 1.00 m |
| Above 4000 sq m | As per the regulations for the non-congested area | As per the regulations for the non-congested area |
Zero is not a rounding. On a plot up to 1000 sq m in a congested area, Table 6-C requires no side margin and no rear margin at all, and a note adds that irrespective of plot area, where the plot width is 7.0 m or less the side margin shall be nil.
Front setbacks work on a different datum from the rest of the code.
Banded by width of the street
- less than 4.5 mResidential: 2.25 m from the CENTRE of the street. Residential with mixed use: 2.25 m plus 1.50 m from the centre.
- 4.5 m to less than 6.0 mResidential: nil. Residential with mixed use: 1.50 m
- 6.0 m to less than 12.0 mResidential: 1.00 m. Residential with mixed use: 2.00 m
- 12.0 m and aboveResidential: 2.00 m. Residential with mixed use: 2.50 m
Source: Chapter 6, Regulation 6.1.1(ii), UDCPR as updated 30 January 2025
On a lane under 4.5 m the setback is measured from the centre of the lane, not from the plot boundary, which is how the code widens a lane without acquiring it. Regulation 6.1.1(iv) makes that explicit for lanes abutting any side of the plot: 2.25 m from the centre, so as to make the lane 4.5 m wide, with no projections over the widened strip.
If margins are zero, light and ventilation have to come from somewhere, and Chapter 6, Regulation 6.9, Interior and Exterior chowk* is where. An interior chowk must be at least 3.0 m by 3.0 m, and not less than the square of one sixth of the height of the highest wall abutting it, measured from the lowest point of the chowk at all levels. An exterior chowk must be at least 2.4 m wide with depth not exceeding twice the width for buildings up to 17.0 m, and above that not less than H/7 by H/7.
The sentence to remember is the disqualifier: if the width of the exterior chowk is less than 2.4 m, it is treated as a notch and is not considered for deriving ventilation. A gap that looks like light on a drawing does not count as light unless it clears 2.4 m.
The concessions have a ceiling
Regulation 6.1.1(vi) is where the congested area regime hands back.
- The setbacks and margins above apply to buildings less than 15.0 m in height.
- From 15.0 m to less than 24.0 m, marginal distances are increased by 1.0 m.
- At 24.0 m and above, marginal distances are as per the regulations of the non-congested area.
So zero side margins are a low rise arrangement. A tower in a congested area pays the same H/5 and 12.0 m cap as one anywhere else, while keeping the congested area's FSI table. Regulation 6.1.1(v) confirms the shape of the bargain: excepting FSI, its maximum loading limit and the marginal distances prescribed here, all other regulations apply.
Chapter 6, Regulation 6.1.2 handles other buildings, meaning public and semi-public, educational, medical, institutional, commercial and mercantile. Their FSI follows 6.1.1, their marginal distances are 3.0 m on all sides including the front up to 24.0 m, and above that the non-congested rules apply. Cinema theatres, multiplexes, assembly buildings and shopping malls go to the non-congested regulations entirely, except for FSI.
Two short provisions close the entry. Chapter 6, Regulation 6.1.3 requires an access pathway to an internal building of not less than 3.6 m. Chapter 6, Regulation 6.1.4 preserves front setbacks prescribed under highway or other rules where they exceed these.
How many plots are small enough for this to matter
Source: ReraGenie analysis of the MahaRERA project registry, 46,636 of 46,654 published projects outside Mumbai City and Mumbai Suburban filing a land area, captured 11 August 2026
Land area is one of the best filled fields in the whole register: 46,636 of 46,654 projects, essentially every one. The median project sits on 1,386 sq m, the tenth percentile on 404 sq m and the ninetieth on 8,900 sq m.
40.8 percent are on 1000 sq m or less, the band where a congested area plot carries no side or rear margin at all, and another 36.3 percent fall in the 1.00 m band. Only 22.8 percent are large enough that Table 6-C sends them to the non-congested rules.
That chart measures plot sizes, not congested area status, and the difference matters. MahaRERA does not record whether a plot is in a congested or core area; that comes from the Development Plan. So this shows how much of the register falls in the size bands Table 6-C uses, not how many projects are actually governed by it.
Mumbai City and Mumbai Suburban are excluded throughout, because Chapter 1, Regulation 1.1, Extent and Jurisdiction* puts the Municipal Corporation of Greater Mumbai outside UDCPR.
What to check on a congested area plot
- Get the prescribed road width first, because 9.0 m is the difference between 1.50 and 2.60 of potential and nothing else recovers it.
- Check the holding size against 0.40 hectare, since Chapter 6, Regulation 6.0 moves a larger holding to the non-congested form rules.
- Design the chowks, not the margins, and hold the exterior chowk above 2.4 m or it counts as a notch.
- Decide the height band before the layout, because 15.0 m and 24.0 m change the margin regime under the same FSI table.
- Price ancillary area FSI at your authority's rate, 15 percent in Pune and Thane and 10 percent elsewhere, then read the UDCPR FSI rulebook for the non-congested position.
Where the filings come in
The code says what a tight urban plot may carry. The register says what was declared on it and whether it was delivered on time. ReraGenie's project analysis, Rs 2,999 for one project, reads a project's full MahaRERA filing: the filed land area, the promoter's extension history with their stated reasons, the slip between original and current completion dates against the median for the same pincode, construction progress against the eleven activity checklist building by building, and complaints and litigation with case numbers. The area consolidated report covers a whole micro-market at Rs 2,999 for the first project and Rs 1,999 per additional one.
Every project's filing is free to read at reragenie.com/projects, and the question that comes before all of this is which rulebook governs your plot.
Source: Unified Development Control and Promotion Regulations for Maharashtra, UDCPR as updated 30 January 2025. Sanctioned under the Maharashtra Regional and Town Planning Act, 1966.
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