New states and boundary adjustment, etc
Section 8(3) · 1999 Constitution (2004 edition)
What Constitution says
(3) A bill for a Law of a House of Assembly for the purpose of creating a new local government area shall only be passed if - (a) a request supported by at least two-thirds majority of members (representing the area demanding the creation of the new local government area) in each of the following, namely - (i) the House of Assembly in respect of the area, and (ii) the local government councils in respect of the area, is received by the House of Assembly; (b) a proposal for the creation of the local government area is thereafter approved in a referendum by at least two-thirds majority of the people of the local government area where the demand for the proposed local government area originated; (c) the result of the referendum is then approved by a simple majority of the members in each local government council in a majority of all the local government councils in the State; and (d) the result of the referendum is approved by a resolution passed by two-thirds majority of members of the House of Assembly.
This is the 1999 Constitution as published in 2004. Later amendments aren't included yet, so a section may have changed since.
Original source
Official Gazette · CFRN 1999 official PDF · printed page 22–24. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections