Chennai CMDA - FSI rule clarity

Q: I have a 45x80 plot in chennai with a 40 Ft road iin front, and would like to build a stilt (car park + security room + gen set + small storage room for flat needs) plus 3 floors. Per CMDA max FSI allowed id 30% over standard 1.5 times plot area. Is the 30% extra on the 1.50 meaning 1.50*1.30= 1.95 or 1.5+.30 = 1.80 times the plot area. Not very clear on this rule.
Let us say it is 1.95X plot 3600 = 7020 sq ft. if 7020 sft FSI is permissible, how much space should i allow at a minimum ton all 4 sides to be in compliance with CMDA.
Also please clarify does FSI include common areas as stair case, lift, gen set, watchman room and stilt level toilet , balconies etc. The ruleas are confusing. Will greatly appreciate an answer from knowledgeable sources. Thanks.

Joseph, Chennai

3rd June 2014

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Hey Joseph, 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% it means it would be 1.95.

You can follow this article, you can get details through this. Building regulation in Chennai

And also FSI does not include common areas as stair case, lift, gen set, watchman room and stilt level toilet , balconies etc.

Srinivas , Chennai

3rd June 2014

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Mr. Srinivas, Thanks for your comments. OK now that I know I can build 1.95 times 3600 = 7020 sft, in order to accomplish that on a stilt plus 3, are the minimum set backs (spaces on sides and back) going to prevent me from accomplishing that total built sq ft of 7020. I am afraid with other rules on the minimum open spacing etc., I may not be able to build a 7020 sq ft . Can you please advise what would be max living space attainable. By the way are you a engineering architect and do you design CMDA compliant architectural plans for residences in Chennai.

Joseph, Chennai

3rd June 2014

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