Home/Garden Suites in Ontario
Also called a laneway suite, coach house, in-law suite — or, in by-laws, an ADU
Garden Suites in Ontario
A garden suite is a self-contained home for your backyard — factory-built, set on a permanent foundation, and ready in months. See if you can build one on your lot, and what it costs.
What is a garden suite?
A garden suite is a small, complete home in the backyard of a property that already has a house on it — its own entrance, kitchen, bathroom, and living space, fully separate from the main house. People use them for an aging parent, a grown kid, guests, a home office, or rental income.
You'll hear the same thing called a laneway suite, a coach house, a backyard suite, or an in-law suite. Ontario zoning by-laws use the technical terms ADU (Accessory Dwelling Unit) or ARU (Additional Residential Unit). They all mean one thing: a second, permanent home on your lot.
It's a real house, not a trailer. Our garden suites are CSA-certified, finished in the factory, and set on a permanent foundation — the same Ontario Building Code path as a site-built home. It can be mortgaged, insured, and rented like any home. Modular vs. manufactured vs. mobile — the difference →
Thanks to recent provincial legislation, most Ontario homeowners can now add a garden suite “as of right” — without rezoning — on a serviced residential lot. The exact size, height, and setbacks come down to your municipality's by-law.
Which garden suite fits? 3 quick questions
We'll narrow the 7 factory-built suites that fit a typical Ontario backyard to the ones that fit your life. No email needed.
1 · Who's it for?
2 · What layout?
3 · What size feels right? (Ontario lots typically allow up to ~700 sq ft)
The sizes above use a typical Ontario allowance. Enter your address and get your Backyard Report — the exact size your lot allows, plus the models that fit, the all-in cost, and financing — in seconds.
Get my Backyard Report →What a garden suite costs — and how it's paid for
The home, from $96,244. That's the factory-built suite itself. Site work — foundation plus water, sewer or septic, and hydro hookups — typically adds $15,000–$25,000 depending on your lot. Because it's built in a factory at a fixed price, you skip the two biggest risks of backyard construction: blown timelines and cost overruns.
Financed like any house. A permanent, foundation-set suite qualifies for a regular mortgage. CMHC Prefab Plus allows an insured mortgage with as little as 5% down on the first $500,000, with the money released in stages as the home is built. How modular financing works →
Often exempt from development charges, which can save tens of thousands, and many municipalities offer grants for suites rented at affordable rates. See the Ontario ADU grants directory →
Thinking of renting it out? A garden suite typically earns $1,700–$2,000+/month. Run the rental numbers →
Why factory-built for a backyard suite
Fixed price
The suite is quoted and built at a set price in the factory — no open-ended backyard-construction bill.
Months, not years
Built in the factory while your site is prepped, then delivered and set in days. Move-in in about 4–6 months.
A permanent house
CSA-certified, code-built, foundation-set. Mortgageable, insurable, and rentable — not a trailer.
Garden suites in Ontario — FAQ
What is a garden suite?
A garden suite is a small, self-contained home in the backyard of a property that already has a house on it. It has its own entrance, kitchen, bathroom, and living space. You may also hear it called a laneway suite, coach house, backyard suite, in-law suite, or — in municipal by-laws — an Additional Residential Unit (ARU) or Accessory Dwelling Unit (ADU). They all describe the same thing: a second, permanent home on your lot.
Is a garden suite the same as an ADU?
Yes. "ADU" (Accessory Dwelling Unit) and "ARU" (Additional Residential Unit) are the technical terms Ontario zoning by-laws use. "Garden suite" is the everyday name for the detached, backyard version. When our ADU Checker says you can build an ADU, it means you can build a garden suite.
Can I build a garden suite on my property in Ontario?
On most serviced residential lots, yes — provincial legislation now lets homeowners add a garden suite "as of right" in most municipalities, without rezoning. But the exact size, height, and setbacks are set by your municipality’s by-law, and servicing (municipal vs. well and septic) matters. Enter your address in the ADU Checker for a straight answer for your specific lot.
How much does a garden suite cost?
A complete factory-built garden suite — the home itself — starts around $96,244. Add site work: foundation, plus water, sewer/septic, and hydro hookups typically run another $15,000–$25,000 depending on the site. Because the home is built in a factory at a fixed price, you avoid the timeline and cost-overrun risk of building in your backyard from scratch.
How long does it take to build a garden suite?
A factory-built garden suite is typically ready in about 4–6 months from order — the home is built in the factory while your site and foundation are prepared, then delivered and set in days rather than months of on-site construction.
Do garden suites pay development charges in Ontario?
Generally no — Ontario legislation exempts most garden suites and laneway suites from municipal development charges, which can save tens of thousands of dollars compared with other new construction. Some municipalities also offer grants for garden suites rented at affordable rates.
Is a garden suite a real house, or a trailer?
A real, permanent house. Our garden suites are CSA-certified, factory-finished, and set on a permanent foundation — the same building code path as a site-built home (OBC Part 9.1.1.9), not a park-model trailer. It can be mortgaged, insured, and rented like any home.
Want the full how-to? Read the complete modular garden suite guide → Or see the by-law for your city in the ADU rules by city directory →