VURB and JV3 are both verification methods of compliance with the energy efficiency requirements of NCC. The methods and are basically the same methods but applicable to different building classes . VURB is an alternative solution to achieve compliance under NCC Vol 2.0 Part 3.12 for Class 1 and Class 10 buildings. JV3 is an alternative solution to achieve compliance under NCC Vol 1.0 Section J for common parts of Class 2, Class 3 to Class 9 buildings.