New states and boundary adjustment, etc
Section 8(2) · 1999 Constitution (2004 edition)
What Constitution says
(2) An Act of the National Assembly for the purpose of boundary adjustment of any existing State shall only be passed if- (a) a request for the boundary adjustment, supported by two-thirds majority of members (representing the area demanding and the area affected by the boundary adjustment) in each of the following, namely- (i) the Senate and the House of Representatives, (ii) the House of Assembly in respect of the area, and (iii) the local government councils in respect of the area. is received by the National Assembly; and (b) a proposal for the boundary adjustment is approved by - (i) a simple majority of members of each House of the National Assembly, and (ii) a simple majority of members of the House of Assembly in respect of the area concerned.
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