In 1958, the former City of Halifax adopted the grid-based 4-digit civic numbering schema that still exists on the Halifax Peninsula. Street numbering previously had been ad-hoc and new developments required awkward local re-numbering. The new grid-system imposed a geographic logic to civic numbers that was popular in many North American cities at the time.
The Commissioner on Works distributed a detailed explanation of the new system to all city households. Street Renumbering Procedures show how staff implemented the new system.
The re-numbering was phased in over the next few years, as every house was assigned a new number by the end of 1965. See the Street Re-numbering Progress Reports, to know exactly when a particular street was re-numbered.