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                   58504 Points
                   Joined June 2010
                
               
			  
			  
             
            
             Hi Akku,
For Trader License / Certificate of Enlistment with KMC (Kolkata Municipal Corporation), the area for calculating the license fee typically refers to the built-up or covered area of your business premises, not the super built-up area.
Here's why:
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Super built-up area includes common areas like terraces, stairs, passages, etc., which usually are not considered for license fees because you don’t have exclusive possession or usage of those spaces. 
- 
Built-up area (or covered area) refers to the actual physical space covered by your shop or premises — walls, rooms, storage, etc., which you exclusively occupy. 
- 
Carpet area is the usable floor area inside the premises but is generally smaller than built-up area and rarely used for license fee calculations. 
Since KMC guidelines are not explicitly available online, it's standard municipal practice to ask for the built-up/covered area for license fee calculation.
My suggestion:
When you apply, mention the built-up area of your premises. Also, keep the floor plan handy, and if needed, consult with the KMC office directly or a local professional for confirmation.