Garden suite Oakville. Designed to the survey, not to a catalogue.

Key takeaways

Updated October 13, 2026.

Most serviced lots can now hold three units as-of-right under Bill 23: the house plus two additional residential units. Oakville's zoning by-laws allow either two attached units, or one attached unit plus one detached unit (By-law 2014-014, s. 4.1, south of Dundas Street; By-law 2009-189, s. 4.29, in North Oakville). A basement apartment does not block you from adding a detached suite.

Garden suite Oakville is designed to the survey

Oakville has no twin of Mississauga's 430 and 600 plans, and no Toronto catalogue. Oakville's zoning allows either two attached units, or one attached unit plus one detached unit, not two detached suites. South of Dundas Street that rule is in By-law 2014-014, section 4.1. North Oakville, between Dundas Street and Highway 407, uses By-law 2009-189, section 4.29. There is no instant zone-code lookup for an Oakville address on this site. Setbacks and height are confirmed on the survey, not quoted here as one town-wide number.

What you can actually build here

Oakville does not publish a free pre-approved catalogue the way Mississauga does (studio 430 / one-bed 600) or Toronto does (studio + two-bed garden). There is no Modular X "Oakville 430/600" on file at the Town.

We design custom, or we adapt a plan to the lot and to the Town's ARU rules. Same team. Zoning and Building still review how the building sits on your lot.

See how we draw: Plans. Those drawings are a starting point, not an Oakville-certified set.

We do not build laneway suites in Oakville. That product is Toronto, on a public lane.

The lot rules that stop a build

We confirm setbacks, height, coverage, and servicing on the survey at feasibility. Oakville's ARU standards sit in the zoning by-law and vary by zone (south of Dundas uses By-law 2014-014; North Oakville, between Dundas and Highway 407, uses By-law 2009-189). We will not invent a rear-setback number that the Town has not published as a single town-wide figure.

What we can say from the Town's current ARU text:

• What it is: a detached additional residential unit in an accessory building associated with a detached, semi-detached, or townhouse dwelling
• How many: one detached unit plus one attached unit, or two attached units — not two detached suites
• Entrance: a separate entrance cannot face a yard that is less than 1.0 m
• Services: municipal water and sewer on a serviced lot. We confirm connections at feasibility
• Bill 23 / O. Reg. 462/24: as-of-right additional units on most serviced urban lots; provincial standards also speak to coverage and building separation. The Town's by-law still sets height and setbacks

Heritage conservation districts, the Natural Heritage System, Conservation Halton lands, and protected trees add review. Those are lot-specific.

Trees, existing sheds, and a hydro or gas meter in the path kill more projects than a zone label does. We check those on the lot.

Feasibility first — no instant zone code

Oakville is not on our instant zoning map. That tool covers Toronto and Mississauga only.

Start the feasibility form. Skip any expectation of a typed-address zone code. If the lot still holds after the quiz, we book a free site assessment and read the survey.

Two ways to build

Same accountable team. Same finish standard.

Full custom — foundation-up on your lot. Typical 9–14 months. Best for irregular lots, heritage conditions, and a house you want the suite to match.

Modular crane-in — we pour the slab and run utilities while the unit is built on a factory floor. Typical 5–8 months. One crane day. Less weather risk. Crane access from the street or a neighbouring yard has to work; we will tell you if the pick does not work before you pay for a module.

We do not pass stock photos off as completed Modular X jobs. Factory and jobsite footage is the record.

What it costs (illustrative)

A typical one-bed turnkey elsewhere in the GTA is illustrated around $310,000. That is not an Oakville quote. Lot, servicing, trees, heritage or Conservation review, and finish level move the number.

We do not invent an Oakville rebate, grant, or development-charge waiver on this page. Confirm current Town and Regional fees on the published schedule at application.

Permits, without the theatre

1. Feasibility and site assessment — survey, zone, trees, servicing
2. Custom or adapted plan that fits the current ARU rules
3. Site plan and grading / drainage as the Town requires
4. Building permit through Oakville Building Services
5. Conservation Halton or heritage review if the lot requires it
6. Inspections through occupancy (building, HVAC, plumbing, ESA)

We run the file. You pick the plan and the finishes.

Incomplete files come back. A clean survey and grading package is the schedule.

Who this is for

Homeowners in Old Oakville, Kerr Village, Bronte, Glen Abbey, River Oaks, Clearview, Palermo, and the rest of Oakville who want a legal second dwelling — for parents, adult kids, or a household member — and want one team from the lot check to keys.

Those names are places we work. They are not a ranking and not proof that every lot qualifies.

We do not build laneway suites in Oakville. If you are in Toronto or Etobicoke on a public lane, use laneway suites in Toronto. For Mississauga's pre-approved 430 / 600 path: garden suites in Mississauga. Also Toronto, Brampton, our services, and modular vs site-built.

Related: pre-approved garden suite plans (Mississauga / Toronto catalogues) · garden suite builder in Mississauga · modular vs site-built · garden suites in Burlington · GTA garden suite rules compared · garden suite cost in Ontario · what a garden suite is · lot check · Home

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