Secondary Dwelling Unit Zoning By-law Amendment


What is Happening?

 The Municipality of Mississippi Mills has initiated a Zoning By-law Amendment (File Number: Z-07-22) to clarify and simplify the rules regarding Secondary Dwelling Units across the Municipality. The proposed Zoning By-law Amendment will make it easier for homeowners in Mississippi Mills to add a Secondary Dwelling Unit to their property.

Why is the Municipality Doing This?


In 2019, the Provincial Government made changes to Ontario’s planning legislation. These changes directed municipalities to permit “Additional Residential Units” in a detached house, semi-detached house, or townhouse. The legislation also clarified that these units could be in a detached accessory building.

The Municipality’s current Zoning By-law permits “Additional Residential Units” as “Secondary Dwelling Units”; but the current rules for these units are more restrictive than what the Provincial Government has directed. For example, Secondary Dwelling Units are not currently permitted to be in an accessory building in the Municipality’s Zoning By-law.


What are Secondary Dwelling Units?


Secondary Dwelling Units are an additional residential unit that can be built on a residential lot where an existing detached house, semi-detached house, or townhouse is located. These are permanent residential units that can either be in the same building as the existing dwelling or in a separate building that is accessory to the existing dwelling.

More and more people are considering the addition of an additional unit to their home. Secondary Dwelling Units can make homeownership more attainable for homeowners and homebuyers, and they can also provide attainable rental options for those who may be looking to rent a home in the community.

Secondary Dwelling Units can be a beneficial form of development because:

  • They can act to support changes in demographics by providing housing options for different family types; and,
  • They can help maximize densities which in turn support and enhances local businesses, labour markets, and the efficient use of infrastructure.

What Changes are Being Proposed?


The Zoning By-law Amendment proposes to revise the definition for Secondary Dwelling Units and amends the existing provisions regarding Secondary Dwelling Units in Section 8.16 to be in compliance with Provincial Rules.

The proposed zoning would permit Secondary Dwelling Units in both the same building as the principal dwelling unit and in detached buildings ancillary to principal dwelling units, such as detached garages.  


What Comes Next?


A Public Meeting for the subject Zoning By-law Amendment will be held on Tuesday, June 7, 2022, at 6:00 p.m. The Public Meeting will be held virtually through the Municipal ‘Zoom’ platform, where oral submissions for the Public Meeting can be made. If you are interested in attending the Public Meeting via ‘Zoom’, please email the assigned Planner noted below.

A staff report with a more fulsome analysis of the proposed amendment will be prepared following the Public Meeting scheduled for June 7, 2022, in order to fully consider any and all public comments received. Draft proposed zoning will be prepared by Planning Staff along with the full staff report.

Following the Public Meeting, Committee and Council will consider the Zoning By-law Amendment.

Notice of Public Meeting - Proposed Zoning By-law Amendment 


How Do I Get Involved?


You can provide comments to Municipal Staff by attending the Public Meeting on Tuesday, June 7, 2022, at 6:00 p.m. Additional information relating to the proposed Zoning By-law Amendment may be requested from the assigned planner via phone, e-mail or mail. You may also submit comments via e-mail or mail to the assigned planner noted below.

For more information, please contact:

Jeffrey Ren, Planner                                Melanie Knight, Senior Planner

613-256-2064 ext. 206                           613-256-2064 ext. 259                

For more information, please contact:

Jeffrey Ren, Planner                                Melanie Knight, Senior Planner

613-256-2064 ext. 206                           613-256-2064 ext. 259