Ontario’s guidance on additional residential units (ARUs) in prime agricultural areas describes a conditional policy path, not an automatic permission for every rural parcel. The applicable designation, local implementation, protected-plan rules, and site facts must be established before relying on the general policy.
What the provincial guidance describes
The Government of Ontario page says the Provincial Planning Statement, 2024 requires planning authorities to permit up to two ARUs in prime agricultural areas where a residential dwelling is permitted on the lot, subject to stated criteria. If two ARUs are proposed, at least one must be within or attached to the principal dwelling. The examples include basement or accessory apartments, additions, units within or attached to garages and other accessory structures, and detached coach houses or garden suites.
The phrase “up to two” is conditional. The current provincial guidance identifies Minimum Distance Separation (MDS) formulae, compatibility with surrounding agricultural operations, appropriate sewage and water services, public-health and safety considerations, limited scale and location, and minimizing agricultural land removed from production. It also distinguishes MDS I setbacks from livestock facilities on neighboring lots: a detached ARU must meet the setback, while an ARU within or attached to an existing dwelling does not require an MDS I setback. This distinction does not resolve other MDS, agricultural compatibility, servicing, or local implementation criteria. ARUs cannot be severed into separate residential lots and must remain with the principal dwelling. Greenbelt Plan and Oak Ridges Moraine Conservation Plan directions prevail over the general policy and may be more restrictive.
Verify the land designation and local rule
First confirm through official records whether the property is in a prime agricultural area or a protected-plan area. Then check the municipality’s current zoning by-law and its implementation of provincial policy. MDS, servicing, agricultural compatibility, and parcel conditions require project-specific assessment; the provincial guidance does not establish those results for an address.
The Government of Ontario page shows an update date of July 6, 2026. Check its current text alongside the municipality’s implementation and the parcel’s designation and site-specific criteria before relying on the policy. Contact the municipality and relevant agricultural or conservation authority for the parcel determination. A general ARU policy is not zoning clearance, servicing approval, or a building permit.