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Guelph has loosened its rules on additional dwelling units significantly over the past few years, and it's one of the most common questions I get from buyers looking at income potential or multi-generational living. Here's where things actually stand.  What the city allows In December 2024, City Council approved changes permitting up to four residential units on many low-density residential lots. For a single detached home, that generally works out to the main house plus up to two additional units in an accessory building, or one additional unit inside the home plus up to two in a separate building, depending on configuration. Semi-detached homes, duplexes, and townhouses are generally permitted up to three units per lot. A March 2026 partial settlement at the Ontario Land Tribunal also resolved a number of the appealed provisions around parking, building lengths, and buffer strips, giving more certainty than there was even a year ago. That said, parts of Guelph's zoning bylaw remain under city-wide appeal, so the specific rules that apply to any given property still depend on the zoning, lot size, and existing structures. Units within the main home vs. detached An additional dwelling unit inside the primary home (a basement apartment, for example) is generally capped at 45% of the home's total floor area and a maximum of two bedrooms. A detached unit in the backyard, like a garden suite or coach house, is limited to about 861 square feet, can't cover more than 30% of the yard, and is capped at roughly 6.1 metres in height. Both require their own separate entrance with proper pedestrian access. It's not automatic This is the part buyers sometimes miss: the city's zoning changes create the opportunity, but they don't automatically qualify every property. Lot dimensions, existing buildings, parking availability, servicing capacity, and where entrances can be located all still determine what's actually approvable on a specific lot. The City's ADU Assessment Tool is a good starting point, but for anything beyond a rough sense of feasibility, it's worth a Preliminary Zoning Review or a conversation with a designer or contractor before you count on a unit as part of your purchase decision. Registration is required Any additional dwelling unit, new or existing, needs to be registered with the City under the Additional Residential Dwelling Units bylaw, and it needs a building permit, meets the Ontario Building Code, and passes inspection, including a licensed electrical contractor's sign-off. Adding a unit can also affect your property tax assessment through MPAC. Why this matters if you're buying Whether you're looking for a basement apartment to offset your mortgage, space for a family member, or simply want to know what a property could become down the road, this is exactly the kind of question worth asking before you write an offer, not after. With my construction background, I can often give you a realistic read on a property's potential on the spot, and point you toward the right professional when the answer needs more than a walkthrough.