He said reinstating the posts was also seen by the city's earthquake taskforce as a "quick fix" for what could be an issue if a major quake struck Wanganui.
"Having the verandah posts reinstated is certainly more in keeping with the inner-city streetscape," Mr Barrett said.
"You only have to look at the refurbished Rutland Hotel on the corner of the Avenue and Ridgway St, with its fluted cast-iron columns, to get an appreciation of how good they can look."
Called "proposed change 32", it seeks to address what council officers say are contradictory provisions in the district plan. So while the present rule restricts the use of verandah posts, central city design guidelines encourage them.
Many central city building verandahs were supported by posts but most of these were removed and the verandahs cantilevered to the buildings using tie rods.
Mr Barrett said the posts help reduce structural loads on buildings and are now seen to be in keeping with the character of the inner-city streetscape.
Public submissions close with the council on October 11.