Coastal-Burwood ward councillor David East alleged council staff had wrongly removed a clause from a district plan that would have made it easier for Christchurch residents in the eastern suburbs to rebuild and repair their earthquake-damaged homes.
East made the allegations at a media conference on Monday, but Christchurch mayor Lianne Dalziel has since stood him down.
"I am extremely disappointed about Councillor East's allegations regarding tampering of the District Plan by staff. He is well aware that the appropriate course of action would have been to raise his concerns formally with the Council," Dalziel said.
She said East had been stood down as chair of the Regulatory Performance Committee while an investigation into his code of conduct.
Staff would be working to resolve the issue East raised, Dalziel said.