A reverse slope driveway is one that leads downward from a public street to a parking area, such as a below-grade garage.

  • The City of Toronto’s Zoning By-Law 569-2013 prohibits the construction of below-grade garages for residential buildings anywhere in the city.
  • If you want to build a below-grade garage which needs a reverse slope driveway, you must apply for an exemption through a Minor Variance Application or a Re-zoning Application, depending on your development type.
  • As part of the process of applying for a reverse slop driveway, you may be required to have a Toronto Water Technical Review, if:
    • The Committee of Adjustment’s Notice of Decision or an Ontario Municipal Board decision requires a technical review and approval by Toronto Water.
    • A technical review is requested through a re-zoning application approval process.
    • The application proposes a storm connection to the City’s sewer system to discharge water from the reverse slope driveway’s trench drain.

How to Apply for a Toronto Water Technical Review

To begin the process, you must submit payment.

Please include the property owner or contact person’s phone number and email address.

Payment must be made in person at the following City office, open Monday–Friday from 8:30 a.m.–4 p.m.

Toronto Water Counter, 2nd Floor
North York Civic Centre
5100 Yonge St.
Toronto, ON  M2N 5V7

Payments for the application process will be accepted by credit card, debit, certified cheques or bank drafts. Accepted credit cards include Visa, MasterCard and American Express.

  • After you have submitted the technical review fee, you will be contacted by Toronto Water staff within five business days.
  • Toronto Water staff will review your request and outline the required documentation, which will include, one hard copy each of:
    • Stormwater Management Report, stamped and signed by a professional engineer. This document will help demonstrate the need for the exemption.
    • 1:100 site drainage plan, stamped and signed by a professional engineer.
    • Existing or proposed site/grading plan certified by a registered surveyor, architect or professional engineer.
    • The conditional approval of Committee of Adjustment or decision of OMB (if applicable).
    • Other submissions if and as directed by City staff.


  • Complex applications may require more information, and revisions may be required.
  • The response time after the submission of the first complete application is four to six weeks.
  • The response time after the submission of revisions is ten business days for each revision.

Once staff have reviewed and agreed with all revisions, you must submit the following:

  • Three hard copies of the Stormwater Management Report originally stamped and signed by a professional engineer; and
  • Five hard copies of the 1:100 site drainage plan originally stamped and signed by a professional engineer for each copy.


  • The response time after the final submission is 10 business days.