The installation of plumbing is regulated by Part 7 of the Ontario Building Code.

Plumbing Inspectors are qualified by the Ontario Ministry of Municipal Affairs and Housing. Inspectors receive enquiries, and applications, issue permits and perform inspections of plumbing installations.

It is the responsibility of the property owner to ascertain whether or not a permit is required and to ensure that the work is inspected at the appropriate stages. Before any plumbing work commences an application for a permit should be made and a permit obtained

A permit is required for the following work:
The installation of plumbing in a new building.
The installation of new plumbing in an existing building.
The alteration of existing plumbing.