Deduction u/s 54

According to me 

applicable section to your case is section 54F

if you construct addition floor on existing house you will not get benefit of section 54F

if added floor can be sold seperatly and plan is approved accordingly you can get benefit 

subject to conditions mentioned in section 54F of number of owership of property  

Dear Sir,

As per a judgement dated 1981,U/s - 54  house property does not mean complete independent house, it includes units also.

Does this also apply to Sec - 54F?

I am not aware of Judgement which you have mentioned but , judgement of the court should be compared with facts and conditions of each case which may very from case to case