Second Dwelling Units

A Second Dwelling Unit (SDU) is a self-contained residential unit within a main dwelling (ie. single, semi, townhome dwelling unit) or within a detached building or structure on the same lot as the main dwelling (ie. within a detached garage).

Where permitted, a SDU- also referred to as an in-law suite or garden suite- can be constructed to provide long term rental accommodations for independent family members, friends and people of all demographics. SDUs also make more efficient use of existing infrastructure and the housing stock, and are a great way to generate rental income to assist with the cost of home ownership.

Where are SDUs permitted?

1. A SDU is permitted in a detached building or structure ancillary to a main dwelling (such as within a detached garage or garden suite constructed for such purpose) in Agricultural and select Residential zoning districts.
2. A SDU is also permitted within a single, semi, or town home dwelling unit in Agricultural and select Residential zoning districts.
3. in Agricultural and select Residential zoning districtsA SDU is not permitted in a mobile home or residential zoning districts permitting exclusively three (3) season occupancy.
4. A SDU is not permitted within a required front, side, or rear yard.
5. A SDU in an ancillary building is not permitted on a lot with less than the required minimum lot width.

Land Use Policy and Zoning Regulations

• A SDU cannot be severed from a lot to create a new and separate lot.
• The Gross Floor Area (GFA) of the SDU cannot exceed the GFA of the main dwelling.
• A SDU is limited to one (1) storey in height in a residential district except where a SDU is located within an accessory building (ie. garage) that is not located within a required yard.
• One (1) onsite (ie. off-street) parking space is required for each dwelling unit.
• A separate service connection will not be permitted to service a SDU when available services are municipally owned and operated.
  • A SDU cannot be used in whole or in part as a short term rental.
  • Tiny homes, which are not a defined term in the Ontario Building Code or the Town’s Zoning By-law, can be considered a SDU.
  • A motor home, recreational vehicle, or trailer is not considered a SDU.

Building Permit Required

A building permit is required for the addition or construction of a SDU, and may be required for the conversion of SDUs within the main building (for example, basement or attic suites). 

For more information on constructing and/or adding SDUs in the Town of Essex , please  follow the link below to the SDU Building Manual or contact the Building Division at buildingdept@essex.ca or 519.776.7336 ext. 1400.

Guide to Second Dwelling

Planning Department
Town of Essex, 33 Talbot Street South, Essex, Ontario N8M 1A8, T. 519-776-7336 ext 1128
essexplanning@essex.ca