Building permit intelligence · St. Catharines, ON
331 Grantham Avenue has 24 municipal building permits on file. The latest recorded activity was a plumbing only permit dated May 5, 2026. PropertyLabs also identified 11 mapped permits within 500 m of this address.
Private side sanitary repair and water service upgrade from 1/2' to 1'.
Private side sanitary repair and water service upgrade from 1/2' to 1'.
Private side sanitary repair and water service upgrade from 1/2' to 1'.
Private side sanitary repair and water service upgrade from 1/2' to 1'.
Private side sanitary repair and water service upgrade from 1/2' to 1'.
11 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 24 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 331 Grantham Avenue is dated May 5, 2026. Municipal records can be corrected or updated after publication.
See the contractors, applicants, permit holders, permit numbers, and project documents associated with 331 Grantham Avenue in the PropertyLabs platform, along with alerts when new permits are filed at this address.
Private side sanitary repair and water service upgrade from 1/2' to 1'.
Private side sanitary repair and water service upgrade from 1/2' to 1'.
Private side sanitary repair and water service upgrade from 1/2' to 1'.
Private side sanitary repair and water service upgrade from 1/2' to 1'.
Private side sanitary repair and water service upgrade from 1/2' to 1'.
Private side sanitary repair and water service upgrade from 1/2' to 1'.
Private side sanitary repair and water service upgrade from 1/2' to 1'.
Alter Interior of Basement to Create an Accessory Dwelling Unit
Alter Interior of Basement to Create an Accessory Dwelling Unit
Alter Interior of Basement to Create an Accessory Dwelling Unit
Alter Interior of Basement to Create an Accessory Dwelling Unit
Alter Interior of Basement to Create an Accessory Dwelling Unit
Alter Interior of Basement to Create an Accessory Dwelling Unit
Alter Interior of Basement to Create an Accessory Dwelling Unit
Alter Interior of Basement to Create an Accessory Dwelling Unit
Alter Interior of Basement to Create an Accessory Dwelling Unit
Alter Interior of Basement to Create an Accessory Dwelling Unit
Alter Interior of Basement to Create an Accessory Dwelling Unit
Alter Interior of Basement to Create an Accessory Dwelling Unit
Secondary Buildings · Jun 26, 2026