ADU Feasibility in Ajax, Oshawa & Whitby (Durham Region)

Zoning limits, typical rent, and 5%-down CMHC Prefab Plus financing for accessory apartments and garden suites in Durham Region — checked against 2026 by-laws and market data.

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Zoning Rules for Ajax, Oshawa & Whitby (Durham Region)

Max ADU Size
860 sq ft
Rear Setback
0.6 m
Side Setback
0.6 m
Max Height
4.5 m

As-of-right status: Varies by city. ~80 m² typical, varies by city — Oshawa, Ajax and Whitby each have their own by-law.

Ajax is moving toward permitting up to 4 units per lot — among the most permissive policies in Durham Region.

Source: Oshawa, Whitby, Ajax municipal zoning info, 2026

⚠️ 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 Ajax, Oshawa & Whitby (Durham Region) ADU Rent (2026)

Studio
$1,250/mo
1-Bedroom
$1,650/mo
2-Bedroom
$1,970/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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Ajax, Oshawa & Whitby (Durham Region) ADU — Frequently Asked

Is Durham Region a good place to build an ADU?
Yes — Durham has some of the most affordable land and construction costs in the GTA, though rents are also lower, which affects your cashflow math.
What is the typical setback requirement in Oshawa?
A minimum 0.6m (2ft) from interior side and rear lot lines, with 3m required between the main house and the ADU.
How much rent can I expect for a Durham ADU?
Roughly $1,650/mo for a 1-bedroom and $1,970/mo for a 2-bedroom as of 2026 — noticeably lower than Toronto or the western GTA.

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