The full form of the OC in the Real Estate context is “Occupancy
Certificate”, and its importance can't be overstated. An occupancy
certificate is a document that is issued at the end of construction,
by a planning authority or local government agency. OC also
certifies that the construction of the building has complied with
the approved plans hence stating the building/project is completed
and is ready to be occupied.
A Completion Certificate (CC) is
an important legal document that certifies that a building is
constructed according to the laid down norms and master plan of the
project.