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Due to the sheer number of construction and development projects being carried out simultaneously, often the deciding factor for the question “Which project is better?” is dependent on whether these projects meet Chennai Metropolitan Development Authority (CMDA) guidelines. Though the CMDA guidelines for developmental projects are quite extensive, let us look into one of the most important highlights that buildings should meet in order to receive CMDA approval.

The rules laid down by the CMDA divide buildings into three types, ordinary buildings, special buildings and multi-storeyed buildings. This classification is based on the height of the buildings, number of households in a plot and extent of commercial activity. The ‘ordinary’ buildings are the buildings that do not exceed a height of 9 m (30’) in height. These are generally low ground plus one-storeyed building. The ‘special buildings’ cannot exceed a height of 15 m (50’). These are generally residential or commercial buildings with more than two floors but not more than 4 floors. The ‘special buildings’ are, as the name suggests, a special type of multi-storeyed buildings. These consist of residential buildings with more than four dwelling units and commercial buildings exceeding 300 meter square (3228 sq. ft.) of plinth area.  When it comes to these buildings, the height of 15 m matters more than the use to which they are put, be it residential or commercial.

However, most of the buildings, nowadays, fall under the ‘special category’ section and hence, this is the topic we will take forward here.

The Floor Space Index (FSI), also known as Floor Area Ratio (FAR), Floor Space Ratio (FSR) and Plot Ratio, is the index by which the total constructible area can be calculated.  This index is used by the authorities to control the density of development.

Constructible area = Land Area * FSI Index

The FSI for ordinary and special buildings (residential and commercial) is 1.5. This means that the plinth area should not exceed 1.5 times the area of the plot where construction is being projected. If the area of the plot where the construction is proposed is 9600 sq.ft, with a 1.5 FSI, the total plinth area is 14,400 sq.ft. However, there are a few exemptions to the this calculation like parking area, electrical transformer room, garbage area, caretaker's room, etc., provided the plinth area of such service areas does not exceed 10% of the total plinth area. Staircase headroom and the lift machine room in the topmost floor are also excluded from this calculation.

FSI can be availed on all plots that abut on a road that has a minimum width of 30 feet. The premium FSI for plots that meet roads that have a width of 30 feet or more and lesser than 40 feet is 20% of the normal FSI. The buildings on plots that abut roads that have a width more than 40 feet and lesser than 60 feet, have a premium FSI of 30% and the plots that abut a road with a width of 60 feet or more have a premium  FSI of 40%. However, premium FSIs are allowed for specific regions only and are also accompanied by additional premium fees.

 To find out more about Floor Space Index (FSI) in Chennai, visit "Floor Space Index"

Comments   

0 #95 Krishna 2017-05-14 13:48
Nope. G+1 is all you can get done in a 1200 sq.ft.
plot.

Quoting NidhiR:
Hi,

My parents have a land of size 1200sqft. Ground plus first floor is already constructed. Can we construct on second floor?

Thanks,
Nidhi
Quote
0 #94 NidhiR 2017-05-12 16:55
Hi,

My parents have a land of size 1200sqft. Ground plus first floor is already constructed. Can we construct on second floor?

Thanks,
Nidhi
Quote
0 #93 seethalakshmi 2017-05-01 19:30
I have 1800sq feet land in chennai rapuram howmuch FSI and howmany floor to be construct but road is width 40feet G car park 3floor building g+3 possible

Now the question is .... Whether it is possible to get CMDA approval for the reconstruction given the Road width is 40 feet. Thanks.
Quote
-2 #92 Krishna 2017-03-23 01:06
What specific advise do you need.Arnold.

Quoting Arnold Dhayakaran:
Respected Sir

I have already constructed 650 sq ft ground floor house only and now get plan approval as demolition and reconstruction, I am going to partially demolish and construct the first floor and second floor. I need your advise on this.

Arnold W.
Quote
-1 #91 Anitha selva 2017-03-22 17:38
Hi

I own a Individual house at kilpauk with 1786 sq feet. I am planning to go for JV. As CMDA approval How many flats can be build. The road width is 20 feet.
Quote
0 #90 Arnold Dhayakaran 2017-03-22 08:05
Respected Sir

I have already constructed 650 sq ft ground floor house only and now get plan approval as demolition and reconstruction, I am going to partially demolish and construct the first floor and second floor. I need your advise on this.

Arnold W.
Quote
0 #89 Krishna 2017-02-26 11:50
Quoting Sourirajan:
I am residing PRINCE VILLAGE PHASE 1 ELALYA ST. TONDIARPET , CHENNAI 600 081 a major fire broke Loss's burnt more two wheelers ,4 floor buildings ,19 blocks 582 flats
No fire hydrant waterhoose wheel provision s no fire smoke alaram is CMDA approved ?


Hi Sourirrajan,

For CMDA approval, enough space is supposed to be left for people to leave the building. However, for building approval, normally a fire existinguisher should be kept. The maintenance is the onus of the association though.

Do you mean to say that the village had no provision for these things or the buildings?

Thanks,
Krish
Quote
0 #88 Sourirajan 2016-10-31 10:11
I am residing PRINCE VILLAGE PHASE 1 ELALYA ST. TONDIARPET , CHENNAI 600 081 a major fire broke Loss's burnt more two wheelers ,4 floor buildings ,19 blocks 582 flats
No fire hydrant waterhoose wheel provision s no fire smoke alaram is CMDA approved ?
Quote
0 #87 Krishna 2016-07-19 23:27
Hi Subhramanyam,

I would suggest that you get in touch with a builder and architect. A lot would depend on the extent of your land, the UDS that you all got earlier. shape of your plot, etc.

Thanks and Regards,
Krish
Quote
-1 #86 Subrahmanyam vvv 2016-07-16 15:32
I am having one flat in kodambakkam, now we want to demolish and reconstruct the entire block since the flat has become 30 years old. At present total flats are 31flats in 3.50 grounds.
How many flats we can construct with ground floor keeping for carparking. Whom we have to consult reg approvals.
Quote

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