Depending on the regulatory law in your location (Counrty/State/City) this may vary. Where I am from, the construction area can have two meanings:
1. The common: An area where construction work is being commenced
2 Technical (depending on regulatory law and how it defines it): The horizontal area that can be constructed.
Built-up area:
1. Common: An area that is built (in some countries, nothing is considered built unless cement/bricks are used)
2. Technical: The total contsructed Area, horizontal and vertical in meter/feet square.
Example (regarding Technical meanings):
a land lot of 1,000 m.sq. that falls into, let's say Zone A, where Zone A allows 60% construction area, will then have: 600 m.sq construction area, (let's say 3 floors were built, all 3 of 600m.sq) with a total built-up area of 1,800 m.sq.
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Built up area is the area which has been developed.and floor area is the area which is about to built or about to develope.
Their is no such fix ratio. But approimately it is 70:30 that means 70% of built up is carpet area
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It is understood that the Egyptians built the inclined plane for construction of the pyramids
For Eg: say 20x70m is the land area where a building of two floors (G+1) is to be constructed and 25m length are allocated for porch. This leaves 20x45=900sqm per floor. The built-up area of this double storey house will be 900x2 = 1800sqm (or more if there are extended balconies). Sometimes developer added the roof over the porch, to "increase" the value of the total built up area too. Lets say from the 25m porch length, about 15m are roofed. THis means the final built up area for the example above is = 1800+ (15x20) = 2100sqm