The Floor Space Index (FSI), often referred to as the Floor Area Ratio (FAR), is a crucial planning tool in Mumbai’s urban development, as detailed in the Comprehensive Development Control and Promotion Regulations (DCPR) 20341. It’s a ratio that dictates the maximum permissible built-up area on a given plot of land, directly impacting the scale of construction and urban density2.<\/p>\n\n\n\n
Understanding FSI: Definition and Calculation<\/strong> In simpler terms, the calculation is: When is FSI Allowed and How is it Generated?<\/strong> How is FSI Utilized? The DCPR 2034 also includes the concept of Fungible Compensatory Area (FCA), as per Regulation 31(3)17. This allows for additional built-up area, not exceeding 35% for residential\/industrial\/commercial development, over and above the admissible FSI\/BUA18. FCA can be acquired by paying a premium, which is shared between MCGM, State Government, and MSRDC19. However, in many redevelopment schemes (e.g., slum rehabilitation, cessed buildings, affordable housing), FCA may be granted without charging a premium20.<\/p>\n\n\n\n Restrictions on FSI Utilization and Associated Terms & Conditions FSI Exemptions: What is NOT Counted in FSI?<\/strong> \u25cf Common Areas:<\/strong> Staircase rooms, lift machine rooms above topmost storey, staircase\/lift wells and passages in stilt, basement, and floors exclusively used for parking and other ancillary uses33. What IS Counted in FSI?<\/strong> For example, in a plot of 10,000 sq.m. in the Suburbs with a 9m road width: These calculations highlight the intricate interplay of plot area, road width, existing structures, and new amenity requirements in determining the final developable FSI.<\/p>\n\n\n\n FSI, along with its various components and conditions, is therefore a dynamic and central element of Mumbai’s urban planning, continuously adapted to meet the city’s evolving needs for development and infrastructure.<\/p>\n","protected":false},"excerpt":{"rendered":" The Floor Space Index (FSI), often referred to as the Floor Area Ratio (FAR), is.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-60","post","type-post","status-publish","format-standard","hentry","category-kutir-group"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kutirgroup.in\/blog\/wp-json\/wp\/v2\/posts\/60","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kutirgroup.in\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kutirgroup.in\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kutirgroup.in\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kutirgroup.in\/blog\/wp-json\/wp\/v2\/comments?post=60"}],"version-history":[{"count":1,"href":"https:\/\/kutirgroup.in\/blog\/wp-json\/wp\/v2\/posts\/60\/revisions"}],"predecessor-version":[{"id":61,"href":"https:\/\/kutirgroup.in\/blog\/wp-json\/wp\/v2\/posts\/60\/revisions\/61"}],"wp:attachment":[{"href":"https:\/\/kutirgroup.in\/blog\/wp-json\/wp\/v2\/media?parent=60"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kutirgroup.in\/blog\/wp-json\/wp\/v2\/categories?post=60"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kutirgroup.in\/blog\/wp-json\/wp\/v2\/tags?post=60"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
FSI is defined as the “quotient of the ratio of the combined gross floor area of all floors, excepting areas specifically exempted under these Regulations, to the area of the plot”3.<\/p>\n\n\n\n
FSI=Plot AreaTotal Covered Area on all floors 4<\/p>\n\n\n\n
The DCPR 2034 outlines varying FSI norms based on the zone (Residential, Commercial, Industrial) and the road width abutting the plot5. This tiered approach aims to manage density effectively across Greater Mumbai.<\/p>\n\n\n\n\n
\u25cf Island City (Residential\/Commercial Zones):<\/strong>
\u25cb For road widths less than 9m, the Zonal (Basic) FSI is 1.336.
\u25cb For road widths of 9m and above, the Zonal (Basic) FSI remains 1.33, but higher permissible FSI can be achieved through additional FSI on payment of premium and admissible TDR7.
\u25cf Suburbs and Extended Suburbs (Residential\/Commercial Zones):<\/strong>
\u25cb For road widths less than 9m, the Zonal (Basic) FSI is 1.08.
\u25cb For road widths of 9m and above, the Zonal (Basic) FSI remains 1.0, with higher permissible FSI available through additional FSI on premium and admissible TDR9.
\u25cf Industrial Zones (Island City, Suburbs, and Extended Suburbs):<\/strong> The Zonal (Basic) FSI is generally 1.010.<\/li>\n\n\n\n
<\/strong>The “Permissible FSI” for a plot is the sum of the Zonal (Basic) FSI, Additional FSI on payment of premium, and Admissible TDR16. This total FSI can then be utilized for construction on the plot.<\/p>\n\n\n\n
<\/strong>Several restrictions and conditions govern FSI utilization:
\u25cf Road Width Dependence:<\/strong> The total permissible FSI on a plot is linked to the width of the road it abuts21.
\u25cf Premiums: <\/strong>Premiums are applicable for Additional FSI and Fungible Compensatory Area, with varying rates and sharing mechanisms with the Government2222.
\u25cf Development Cess:<\/strong> A development cess is levied at 100% of the Development Charge for BUA over and above the Zonal (basic) FSI \/ Protected BUA (excluding fungible compensatory area)23. This cess is for off-site infrastructure charges24. The recovery of this cess was suspended for a period of two years from August 20, 201925.
\u25cf Handing Over of Land\/Amenities:<\/strong> In many cases, particularly for redevelopment or amenity plots (e.g., Regulation 14, 15, 17), certain areas of the plot or built-up amenities must be handed over to MCGM or the Appropriate Authority, often free of cost and encumbrances26. The FSI for these handed-over areas is then often transferred to the remaining plot or provided as TDR27.
\u25cf Integrated Scheme Considerations:<\/strong> In cases of industrial zone conversion or large layouts, the entire land holding is considered for determining premiums and amenity requirements28.
\u25cf Validity of Development Permission:<\/strong> Development permissions are typically valid for four years in aggregate and need renewal29.
\u25cf Compliance with Other Regulations:<\/strong> FSI utilization must still conform to other building requirements, such as open spaces, parking, fire safety, and environmental sustainability norms30.
\u25cf No Refund for Excess Premium:<\/strong> If a premium was paid in excess due to earlier regulations, it generally will not be refunded31.<\/p>\n\n\n\n
Regulation 31(1) details a comprehensive list of areas and structures that are exempted from FSI computation32. These exemptions aim to encourage the provision of essential building components and amenities without consuming the developable FSI:<\/p>\n\n\n\n
\u25cf Parking Areas:<\/strong> Basements used exclusively for parking, covered parking spaces within limits, and additional parking (with\/without premium)34.
\u25cf Essential Building Features:<\/strong> Lofts, porches, canopies, chajjas, cornices, weather shades, sun-breakers (with specific projection limits), and certain vertical fins35.
\u25cf Service & Utility Areas:<\/strong> Effluent treatment plants, water treatment plants, sewage treatment plants, suction tanks, pump rooms, electric meter rooms, sub-stations, and refuse chutes\/garbage shafts36.
\u25cf Safety & Welfare Features:<\/strong> Refuge areas (subject to specific rules), fire escape chutes, and one office room for a co-operative society\/apartment owners’ association (up to 20 sq.m)37.
\u25cf Recreational & Environmental Features:<\/strong> Structures within recreational ground (LOS) areas (with limits), open to sky swimming pools on the topmost terrace or podium, rain water harvesting arrangements, and non-conventional energy systems38.<\/p>\n\n\n\n
Conversely, Regulation 31(2) specifies areas that ARE counted in FSI, such as:
\u25cf Covered parking spaces\/garages beyond the exempted limits39.
\u25cf Fire escape balconies40.
\u25cf Part\/pocket\/covered terraces (with exceptions for open terraces at the topmost storey)41.
\u25cf Areas below open-to-sky swimming pools if clearance from the floor level exceeds 1.5m42.
\u25cf Air conditioning plant rooms\/air handling unit rooms (except in basements)43.
\u25cf Service floors other than those specifically exempted44.
\u25cf Balconies that exceed permitted projections or are enclosed45.
FSI Calculations Based on Road and Plot Area (Examples from Annexure)<\/strong>
The DCPR 2034 provides sample calculations (e.g., Annexures I-IV of Circular No. T-5 46464646) to illustrate how FSI and associated amenities are calculated, especially for ongoing proposals transitioning to the new regulations. These annexures demonstrate scenarios where the plot area and existing BUA are considered to determine the “balance BUA to be constructed as per DCPR 2034″47474747.<\/p>\n\n\n\n
\u25cf The Net Plot Area for FSI calculation might be 9500 sq.m after deducting 5% amenity as per Regulation 14(A)4848.
\u25cf The Permissible BUA is then calculated by multiplying the Net Plot Area by the Zonal (basic) FSI and adding any Additional FSI from premium\/TDR4949.
\u25cf If a portion of BUA is already constructed and retained from prior regulations, the Balance BUA is derived by subtracting the retained BUA from the total Permissible BUA5050.
\u25cf Amenity requirements (e.g., under Regulation 14(A)) for the balance development are then applied proportionally to the proportionate plot area of this balance development51515151.<\/p>\n\n\n\n