Capital gain treatment for house sold which was redeveloped

FOR VALUE OF ASSETS PRIOR TO 1.04.81 FAIR VALUE ON 01.04.1981 IS TO BE CONSIDERED.

ADD THE INDEXED COST OF IMPROVEMENT FOR 07-08.

THIS WILL BE THE COST OF OLD HOUSE.

FULL VALUE OF CONSIDERATION -               XXX

LESS : INDEXED COST OF ACQUISTION 
         TAKING FAIR VALUE AS ON 01.04.1981 XXX
         AND PROVIDE INDEXATION

         INDEXED COST OF IMPROVEMENT
         FOR 07-08                                            XXX

LTCG                                                             XXX

 How to get the FMV as on 1/4/81 ie whether to apprach the registered Valuer for this or any specific method is there to calculate the FMV .

Also the building was redeveloped and they have charged some amount for the additional space

There are different methods of valuation and  has to select an appropriate method for arriving at fair market value. As the statute does not prescribe any particular method, the comparative sale method or rent capitalization method as applicable may be applied. 

ITS BETTER IF YOU REFER IT TO PROPER VALUATION OFFICER AS IN FUTURE DISCREPENCY MAY NOT ARISE.

WITH REGARD TO ADDITIONAL SPACE IF THE AMOUNT PAID IS SIGNIFICANT THAN TAKE IT AS COST OF ACQUISITION AND PROVIDE INDEXATION OTHERWISE INCLUDE IT UNDER COST OF IMPROVEMENT.

HOWEVER IF YOU HAVE PAID STAMP DUTY FOR PURCHAE OF ADDITIONAL SPACE.

BETTER SHOW IT AS COST OF ACQUISITION.

REGARDS.

Thank you