Rules, unit limits and incentives vary by municipality. Filter the directory or search your city to see what's permitted and where to read the official details.
Tap any city to open a dedicated guide for that market, with local rules, rent context, and the official municipal page.
Last reviewed: October 2026. Programs change; confirm with your municipality.
The City offers free pre-approved garden and laneway suite plans. Development charge deferral for ancillary second units remains available.
GTA reference rents apply (TRREB Q2 2026 condo averages: 1-bed $2,273, 2-bed $3,013): market reference points, not guaranteed ADU rents.
Permit fees refunded; the 2nd and 3rd ARU are exempt from most municipal charges, lowering build cost.
GTA reference rents apply (TRREB Q2 2026 condo averages: 1-bed $2,273, 2-bed $3,013): market reference points, not guaranteed ADU rents.
Up to three units permitted; Credit Valley or Toronto Region conservation authority approval may be required near watercourses.
GTA reference rents apply (TRREB Q2 2026 condo averages: 1-bed $2,273, 2-bed $3,013): market reference points, not guaranteed ADU rents.
Additional residential units supported through Caledon's housing programs; rural and conservation lands have extra review.
GTA reference rents apply (TRREB Q2 2026 condo averages: 1-bed $2,273, 2-bed $3,013): market reference points, not guaranteed ADU rents.
Up to three ADUs (four units total). The ADU grant intake is closed; a lot-eligibility mapping tool and CMHC catalogue designs are available.
GTA reference rents apply (TRREB Q2 2026 condo averages: 1-bed $2,273, 2-bed $3,013): market reference points, not guaranteed ADU rents.
Five pre-approved detached ADU designs (developed jointly with Whitby) to streamline approvals.
GTA reference rents apply (TRREB Q2 2026 condo averages: 1-bed $2,273, 2-bed $3,013): market reference points, not guaranteed ADU rents.
Shares the Whitby–Pickering pre-reviewed detached ADU design catalogue to speed permitting.
GTA reference rents apply (TRREB Q2 2026 condo averages: 1-bed $2,273, 2-bed $3,013): market reference points, not guaranteed ADU rents.
Additional dwelling units supported across Durham Region; confirm lot-specific rules with the City.
GTA reference rents apply (TRREB Q2 2026 condo averages: 1-bed $2,273, 2-bed $3,013): market reference points, not guaranteed ADU rents.
Up to two ADUs in urban areas; restrictions apply in the Greenbelt and Oak Ridges Moraine.
GTA reference rents apply (TRREB Q2 2026 condo averages: 1-bed $2,273, 2-bed $3,013): market reference points, not guaranteed ADU rents.
Eligible on specific detached, semi and street-townhome lots; one extra parking space per ARU. Not permitted in the Woodbridge Special Policy Area or floodplain.
GTA reference rents apply (TRREB Q2 2026 condo averages: 1-bed $2,273, 2-bed $3,013): market reference points, not guaranteed ADU rents.
Up to three units. Two-unit registration is $246 plus a fire inspection fee; a fourth unit is not currently permitted as of right.
GTA reference rents apply (TRREB Q2 2026 condo averages: 1-bed $2,273, 2-bed $3,013): market reference points, not guaranteed ADU rents.
Up to three ARUs (four total units); a maximum of two ARUs in an accessory building, with municipal services required.
GTA reference rents apply (TRREB Q2 2026 condo averages: 1-bed $2,273, 2-bed $3,013): market reference points, not guaranteed ADU rents.
Both attached ADUs/SDUs and detached ADUs are permitted under the Zoning By-law (as amended by By-law 22-132); Hamilton publishes clear homeowner guidance.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
Up to two additional dwelling units permitted in both urban and rural areas, with a 1.2m setback for detached suites.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
Up to two ARUs (three units total); detached ARU standards updated April 2024, with development charges exempted.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
Welland permits Additional Dwelling Units consistent with Bill 23 (typically up to 2 ADUs per lot in addition to the principal dwelling). Development charges are exempt. Exact unit counts depend on lot characteristics; we confirm in feasibility.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
A coach house is Ottawa's term for a detached suite. Coach houses are subject to size and setback limits in Ottawa's new Zoning By-law 2026-50; up to three units per lot are permitted. Exact size limits vary by lot and zone; we confirm during feasibility.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
Attached, detached, garage-conversion and basement suites are all supported; Kingston strongly encourages additional residential units.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
Up to four units per lot; a unit can in some cases be created via plan of condominium, which may allow separate ownership.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
Up to four units; no City development charges on the first two ARUs (education charges still apply), plus an ARU grant of up to $20K–$30K for affordable-rent units while funds last.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
Offers a one-time grant of up to $10,000 toward an additional residential unit, with no City or Region development charges on ARUs.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
Up to three ADUs on single-detached lots; $170 owner-occupied registration fee per new ADU.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
Up to four units (max two detached, two bedrooms each). London's 2026 ARU construction grants (up to $45,000 affordable / $20,000 standard) and permit-fee waiver are fully allocated and closed (permits issued Apr 29 to Sep 7, 2026). A repayable ARU loan remains available.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
50% off ARU building permit fees for applications submitted Jan 1 to Dec 31, 2026; full rebate if final inspection is within 12 months of permit issuance (no later than Dec 31, 2027). Free pre-approved design catalogue.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
Additional residential units permitted under provincial rules; confirm detached-suite zoning with the City.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
ADUs supported under Bill 23; rural servicing and conservation review may apply on larger lots.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
Up to three units per lot (principal home plus two ADUs); confirm zoning and any Conservation Halton approval.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
ARU fee waivers ran until Dec 31, 2025, and the forgivable loan program closed Oct 1, 2025. Confirm current fees with the City.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
Up to four units on eligible serviced lots. A $340 registration (renewed annually) applies to additional residential units; clear homeowner guidance available.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
Runs a dedicated ARU program; detached garden suites assessed by lot size and servicing.
Below GTA average, typically $1,400–$2,400 for a 1–2 bedroom unit.
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Tell us where you are and we'll give you a quick, no-obligation feasibility read.
A feasibility read is a preliminary opinion only. Every project requires a property-specific feasibility review and municipal approvals.