Permit guideMississaugaBuilding PermitsPlumbing & Drains

Backflow preventer permits

A permit is required prior to installing a backflow preventer.

From Mississauga’s own pages, checked Oct 2026.

  1. Check whether you need a permit

    • Backflow preventer
    • Backflow prevention devices are required under the authority of the Region of Peel’s Backflow Prevention By-law 10-2017 and the Ontario Building Code. The purpose of this by-law is to prevent backflow into the Region’s Municipal Drinking Water System to maintain clean and safe drinking water. For more information on the By-law and the Backflow Prevention Program, please visit the Region of Peel website.
  2. Prepare your plans0 of 7

    Your drawings must clearly show what is existing and the changes you’re proposing. Drawings must be to scale, and should use metric measurements. We may request additional information when your application is reviewed.

    You need an account to see these 7 items.It’s free. Use Sign in at the top of the page to create one, then tick the items off on any device and print them as a checklist.

  3. Complete the forms2

    For a backflow preventer you’ll need to submit:

  4. Submit your application

    All building permit applications must be submitted online through our ePlans portal.

    • Start the building permit application process by creating an ePlans account.
    • Log in to ePlans and navigate to the Building Applications section.
    • Follow the prompts to start the application process.
    • Complete each step by providing the requested information.
    • Submit your building permit request and pay the administration fee.
    • Shortly after submitting your permit request, you’ll receive an email from the City that includes your temporary project number and an invitation to upload drawings and supporting documents.
    • Log in to ePlans and open your applicant upload task under the Current Projects section.
    • Follow the task instructions to upload required drawings and documents.
    • When you upload all of these drawings and documents into ePlans, all files must follow the required file name and format guidelines.
    • After you upload your drawings and documents, the City will start the pre-screen review process to ensure the minimum requirements are met.
    • The time frame for this step is subject to change depending on request volumes.
    • You cannot upload any additional information or respond to comments during the pre-screen review.
    • If the submission requires more information, you will be notified by email with details about the pre-screen corrections. You must complete all pre-screen corrections in order to move ahead with the application process.
    • Once you have paid the required fees, your application will be created and the City will send you a new application number by email.
    • Your application will then be sent for a detailed review by the relevant review groups to make sure it meets the building code, zoning by-law and other applicable laws. Learn more about building permit cost and time frames.
    • When the review is completed by each review group, they will mark your application as either “approved” or “withheld”. You cannot upload any additional information or respond to comments when a file is in review.
    • If any of the review groups have “withheld” your application, you will need to resubmit revised or additional information once all examiners have completed the review. You can view outstanding comments in ePlans on the Project Status Report. The City will send you an “applicant resubmit” email that details what you need to do next. Each resubmission cycle could add two or more weeks to the process.
    • Once your application is approved by all the review groups, you’ll be notified by email that your permit and approved drawings are available to download in ePlans.
    • After receiving your building permit, you are ready to begin work. At this point, you’ll need to be aware of what needs to be kept on site, including your building permit notice and approved drawings, and start scheduling inspections.
    • If you need more information, call 311 (905-615-4311) or contact us online.
  5. Pay the fee

    • The total fees depend on the size, type and use of the proposed project or building. The exact cost of your permit will be calculated once we prescreen your request.
    • For a residential property, a permit will cost a minimum of $244. Permits for non-residential properties will cost a minimum of $386.
    • You will need to pay a $50 administrative fee when you submit your request online. This non-refundable deposit will be credited towards the total cost of your permit.
    • Fees for different types of projects are outlined in the Building Permit Fee Schedule.
    • Once your request passes the prescreen review, the City will send you an email to let you know what additional fees you need to pay.
    • You must pay fees under $40,000 using the applicant’s account in ePlans.
    • You must pay fees over $40,000 by electronic payment.

Written from Mississauga’s own pages as published on 19 October 2026. The municipality decides what a permit needs: confirm with it before you apply. Legal notice

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