ADU Feasibility in Ottawa

Zoning limits, typical rent, and 5%-down CMHC Prefab Plus financing for garden suites and coach homes in City of Ottawa — checked against 2026 by-laws and market data.

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Zoning Rules for Ottawa

Max ADU Size
1,200 sq ft
Rear Setback
1.2 m
Side Setback
1.2 m
Max Height
4.9 m

As-of-right status: Yes, as-of-right. Up from 800 sq ft in the prior by-law — one of the most generous limits in Ontario.

Ottawa's 2026 zoning update roughly doubled the old size cap for detached ADUs, making larger 2-bedroom and XL models much easier to fit.

Source: City of Ottawa 2026 Zoning By-law, Section 202

⚠️ 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 Ottawa ADU Rent (2026)

Studio
$1,400/mo
1-Bedroom
$1,900/mo
2-Bedroom
$2,300/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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Ottawa ADU — Frequently Asked

How big can a detached ADU be in Ottawa?
Up to 1,200 sq ft as of the 2026 zoning update — nearly double the previous 800 sq ft limit, and the most generous size allowance we track in Ontario.
Is a garden suite as-of-right in Ottawa?
Yes, a detached accessory dwelling unit (coach home, garden suite, laneway home) is permitted as-of-right on most Ottawa lots.
What does an Ottawa ADU typically rent for?
Around $1,900/mo for a 1-bedroom and $2,300/mo for a 2-bedroom as of 2026.

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Our $497 Feasibility Report confirms your exact zoning, realistic cost, and permit pathway for your Ottawa property within 48 hours.

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