Building permit intelligence · St. Catharines, ON
312 Grantham Avenue has 13 municipal building permits on file. The latest recorded activity was a residential permit dated May 31, 2026. PropertyLabs also identified 18 mapped permits within 500 m of this address.
Alter Interior of Basement to Create a Duplex
Alter Interior of Basement to Create a Duplex
Alter Interior of Basement to Create a Duplex
Alter Interior of Basement to Create a Duplex
Alter Interior of Basement to Create a Duplex
18 mapped permits within 500 m, shown on the intelligence map above.
4 other addresses on Grantham Ave with municipal permit records in St. Catharines.
This address has 13 permit records in PropertyLabs' public history. The city figures below provide context without changing the focus of this exact-address record.
City coverage counts address-linked rows and does not add overlapping canonical tables. Rolling windows are inclusive, use UTC boundaries, and end Jul 31, 2026.
PropertyLabs compiled this permit history from municipal public records for St. Catharines, ON. The latest recorded permit activity at 312 Grantham Avenue is dated May 31, 2026. Municipal records can be corrected or updated after publication.
See the contractors, applicants, permit holders, permit numbers, and project documents associated with 312 Grantham Avenue in the PropertyLabs platform, along with alerts when new permits are filed at this address.
Alter Interior of Basement to Create a Duplex
Alter Interior of Basement to Create a Duplex
Alter Interior of Basement to Create a Duplex
Alter Interior of Basement to Create a Duplex
Alter Interior of Basement to Create a Duplex
Alter Interior of Basement to Create a Duplex
Alter Interior of Basement to Create a Duplex
Alter Interior of Basement to Create a Duplex
Secondary Buildings · Jun 26, 2026