Ontario SuiteRules Guides | SuiteRulesCanada

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Uses Natural Resources Canada’s national Geolocator to match the address. The rule result comes from SuiteRulesCanada’s audited municipal source set.

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Provincial starting point

Province-level as-of-right baseline

Ontario: specified additional-unit configurations are protected by provincial law.

Section 35.1 of the Planning Act limits municipal zoning power so that, on qualifying urban residential land, zoning cannot prohibit: two units in a detached, semi-detached or rowhouse where ancillary buildings cumulatively have no more than one unit; three units in the main house where no ancillary building contains a unit; or one unit in an ancillary building where the main house contains no more than two units and no other ancillary building contains a unit.

Ontario Regulation 299/19, amended in 2024, applies to these additional residential units and restricts several zoning barriers. The provincial permission is still not a building permit: local setbacks, servicing, hazard constraints and other lawful standards must be checked for the site.

Ontario Planning Act, s. 35.1 ↗O. Reg. 299/19 — Additional Residential Units ↗

Provincial framework reviewed September 20, 2026. “Up to three” describes the protected configurations; it does not mean every parcel can physically or legally accommodate every form.

43 Ontario city guides