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Permit guideWhitchurch-StouffvilleBuilding PermitsAdditional Residential Units

Pre-approved additional residential unit designs

Homeowners can choose from up to four pre-approved ARU designs, free of charge, and must still comply with the Town's Official Plan and Zoning By-law and obtain a building permit prior to any construction.

From Whitchurch-Stouffville’s own page, checked Oct 2026.

  1. Check your property

    Homeowners must still comply with the Town’s Official Plan, Zoning By-law, and obtain a building permit prior to any construction.

    • Please see the Town’s Zoning By-law to see where you can add an ARU or multiplex in the Town.
    • Please see the Town’s Zoning By-law to learn more about the zoning regulations (like height and setbacks).
    If your ARU can’t fully comply with the Zoning By-law

    If an ARU or multiplex is permitted on your property but doesn’t fully comply with the Town’s Zoning By-law (like height and setbacks), you can apply for a Minor Variance.

    • Please see the Town’s Committee of Adjustment webpage to learn more about the minor variance process.

  2. Explore the Design Catalogue

    Review the available pre-approved ARU designs.

    • The Betz – One Bedroom
    • “The Flint” - Pre-approved ARU Design (Studio)
    • “The Forsyth” - Pre-approved ARU Design (One Bedroom)
    • “The George” - Pre-approved ARU Design (One Bedroom)

  3. Select a Design

    Choose a design that fits your property and housing goals.

    • If you wish to make any modification or changes to pre-approved ARU designs, please contact Duncan Patterson Architecture at info@dparchitecture.ca.

  4. Request Design Plans1

    Obtain full pre-approved ARU plan packages from Development Services by completing the Request Form and submit the form to preapprovedaru@townofws.ca.

  5. Apply for a Building Permit

    Submit your pre-approved ARU design plans to Development Services and complete the building permit process to receive a building permit.

    • Please see the Town’s Building & Renovating webpage to learn more about the building permit process to receive a building permit.

Written from Whitchurch-Stouffville’s own pages as published on 16 October 2026. The municipality decides what a permit needs: confirm with it before you apply. Legal notice

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