The 300 sq ft is not usable while 700 sq ft is the remaining area that will be used.
Floor area and built up area.
Suppose there is a very big community in which there are a lot of buildings and my apartment is in one of them.
So if built up area is 1 000 sq ft it implies that 30 per cent i e.
As a rule of thumb the super built up area can be calculated by adding a loading factor to the carpet area which may vary from 15 to 50.
Super built up area means built up area plus common areas proportioned to a unit checkout the illustration below.
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.
Super built up area is the built up area in addition to the proportionate share of entrance lobby corridors stair cases lift shafts lift lobby generator.
Built up area sq ft carpet area external walls service ducts inside property balconies.
What is super built up area.
Built up area is the area that comes after adding carpet area and wall area.
The built up area bua is the total area being developed or constructed.
Generally the built up area works out to be approximately 10 more than the carpet area.
Built up area means the area covered by a typical flat.
As my apartment has two stories the area will be about half of the built up area.
The formula for built up area.
Here is the thing.
Now the wall area does not mean the surface area but the thickness of the inner walls of a unit.
However this is not standard practice and the built up area should be calculated on actual values importance of the built.
In simple terms any floor level which is below the normal floor level will be excluded like the bathroom utility area excluding kitchen what is built up area plinth area.
A typical flat will contains bedrooms living room hall kitchen balcony utility area bathroom shafts.