ADU Feasibility in Hamilton

Zoning limits, typical rent, and 5%-down CMHC Prefab Plus financing for additional residential units (ARUs) in City of Hamilton — checked against 2026 by-laws and market data.

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Zoning Rules for Hamilton

Max ADU Size
807 sq ft
Rear Setback
4 m
Side Setback
0 m
Max Height
6 m

As-of-right status: Yes, as-of-right. 75 m² max, and the ADU can't exceed the primary dwelling's floor area.

The 4.0m setback is measured from the primary dwelling, not the property line — a detail many first-time applicants miss.

Source: City of Hamilton Zoning By-law 05-200

⚠️ Preliminary estimate based on publicly available zoning by-laws as of 2026. Your lot, tree by-laws, and recent amendments may change what applies. Our $497 Feasibility Report includes a verified zoning review for your exact address.

Typical Hamilton ADU Rent (2026)

Studio
$1,300/mo
1-Bedroom
$1,700/mo
2-Bedroom
$2,200/mo

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Financing: CMHC Prefab Plus (5% Down)

As of 2026, CMHC insures mortgages for prefab/modular ADU construction with as little as 5% down and staged funding across 4 milestones — the same terms as buying a regular home.

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Hamilton ADU — Frequently Asked

What is an ARU in Hamilton?
Hamilton's term for an Additional Residential Unit — the same concept as an ADU or garden suite, permitted as-of-right up to 75 m² and 45% combined lot coverage.
Does Hamilton allow a detached backyard unit?
Yes, up to 6.0m in height, with a required 4.0m separation from the main house.
How much does a Hamilton ADU rent for?
Roughly $1,700/mo for a 1-bedroom and $2,200/mo for a 2-bedroom as of 2026 — some of the most affordable rents-to-build-cost ratios in Ontario.

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