Notice: All Toronto Building services have resumed, however, they are being delivered differently, Toronto Building offices are closed at this time, however, please contact the Customer Service, General Inquiries line for further assistance.


You may require a building permit if you are renovating your basement. You do not need a permit if:

  • the work does not include structural or material alterations
  • no additional dwelling unit(s) is (are) created (i.e. a second unit) and
  • the work does not include the installation of new plumbing

If you are doing any of the following work a permit is required:

  • structural or material alterations
  • installing or modifying heating and or plumbing systems
  • excavating and/or constructing foundations
  • basement underpinning
  • constructing a basement entrance
  • adding a second suite

Related information: